From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1122FC4708C for ; Wed, 30 Nov 2022 20:09:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229829AbiK3UJt (ORCPT ); Wed, 30 Nov 2022 15:09:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43680 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229797AbiK3UJo (ORCPT ); Wed, 30 Nov 2022 15:09:44 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50F6A77223 for ; Wed, 30 Nov 2022 12:09:43 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id ACB5261DB5 for ; Wed, 30 Nov 2022 20:09:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8BC3C4347C; Wed, 30 Nov 2022 20:09:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838982; bh=YFde7Cg3Hj4Ke5ExGefyiTVasYPENA1m1IEZnM/nGhM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A14a1RoKENnpBfHuYPvOBvy14wl8bgZAjO+KgTBZZN1D7Y7c5qbkpAkL08G4W0vhe P25WxRhQ1ucar2SW4H5pFWCKA84MbpgWT1FexW0rpHlfefyZ6YJ3FKf0c8lh3euzi9 ytQmYgwsiat7vYEaL2Ht3YenmTUKcYj1gA++qqCNB6MuxAvFB0JZAqkhanhhS0wBch 1rjWI0/vZio+7/wGuzPQNoTzLj6vfGTzCX1Ut4wOeN+UmVtLDDuGy02N3R3wH5zFjY C66PjCpLY4EaPkNLkVSeVisPXDBq/nxH1nY1fcGNcnlSorVg4ns+GJ4p2hlpIB6Hgn V944qClz9qm3A== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 01/11] mm/damon/core: implement damos filter Date: Wed, 30 Nov 2022 20:09:27 +0000 Message-Id: <20221130200937.118005-2-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" DAMOS let users do system operation in a data access pattern oriented way. The data access pattern, which is extracted by DAMON, is somewhat accurate more than what user space could know in many cases. However, in some situation, users could know something more than the kernel about the pattern or some special requirements for some types of memory or processes. For example, some users would have slow swap devices and knows latency-ciritical processes and therefore want to use DAMON-based proactive reclamation (DAMON_RECLAIM) for only non-anonymous pages of non-latency-critical processes. For such restriction, users could exclude the memory regions from the initial monitoring regions and use non-dynamic monitoring regions update monitoring operations set including fvaddr and paddr. They could also adjust the DAMOS target access pattern. For dynamically changing memory layout and access pattern, those would be not enough. To help the case, add an interface, namely DAMOS filters, which can be used to avoid the DAMOS actions be applied to specific types of memory, to DAMON kernel API (damon.h). At the moment, it supports filtering anonymous pages and/or specific memory cgroups in or out for each DAMOS scheme. Note that this commit adds only the interface to the DAMON kernel API. The impelmentation should be made in the monitoring operations sets, and following commits will add that. Signed-off-by: SeongJae Park --- include/linux/damon.h | 51 +++++++++++++++++++++++++++++++++++++++++++ mm/damon/core.c | 39 +++++++++++++++++++++++++++++++++ 2 files changed, 90 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 35630634d790..42cea3bf7319 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -8,6 +8,7 @@ #ifndef _DAMON_H_ #define _DAMON_H_ =20 +#include #include #include #include @@ -215,6 +216,39 @@ struct damos_stat { unsigned long qt_exceeds; }; =20 +/** + * enum damos_filter_type - Type of memory for &struct damos_filter + * @DAMOS_FILTER_TYPE_ANON: Anonymous pages. + * @DAMOS_FILTER_TYPE_MEMCG: Specific memcg's pages. + * @NR_DAMOS_FILTER_TYPES: Number of filter types. + */ +enum damos_filter_type { + DAMOS_FILTER_TYPE_ANON, + DAMOS_FILTER_TYPE_MEMCG, + NR_DAMOS_FILTER_TYPES, +}; + +/** + * struct damos_filter - DAMOS action target memory filter. + * @type: Type of the page. + * @matching: If the matching page should filtered out or in. + * @memcg_id: Memcg id of the question if @type is DAMOS_FILTER_MEMCG. + * @list: List head for siblings. + * + * Before applying the &damos->action to a memory region, DAMOS checks if = each + * page of the region matches to this and avoid applying the action if so. + * Note that the check support is up to &struct damon_operations + * implementation. + */ +struct damos_filter { + enum damos_filter_type type; + bool matching; + union { + unsigned short memcg_id; + }; + struct list_head list; +}; + /** * struct damos_access_pattern - Target access pattern of the given scheme. * @min_sz_region: Minimum size of target regions. @@ -239,6 +273,7 @@ struct damos_access_pattern { * @action: &damo_action to be applied to the target regions. * @quota: Control the aggressiveness of this scheme. * @wmarks: Watermarks for automated (in)activation of this scheme. + * @filters: Additional set of &struct damos_filter for &action. * @stat: Statistics of this scheme. * @list: List head for siblings. * @@ -254,6 +289,10 @@ struct damos_access_pattern { * If all schemes that registered to a &struct damon_ctx are inactive, DAM= ON * stops monitoring and just repeatedly checks the watermarks. * + * Before applying the &action to a memory region, &struct damon_operations + * implementation could check pages of the region and skip &action to resp= ect + * &filters + * * After applying the &action to each region, &stat_count and &stat_sz is * updated to reflect the number of regions and total size of regions that= the * &action is applied. @@ -263,6 +302,7 @@ struct damos { enum damos_action action; struct damos_quota quota; struct damos_watermarks wmarks; + struct list_head filters; struct damos_stat stat; struct list_head list; }; @@ -516,6 +556,12 @@ static inline unsigned long damon_sz_region(struct dam= on_region *r) #define damon_for_each_scheme_safe(s, next, ctx) \ list_for_each_entry_safe(s, next, &(ctx)->schemes, list) =20 +#define damos_for_each_filter(f, scheme) \ + list_for_each_entry(f, &(scheme)->filters, list) + +#define damos_for_each_filter_safe(f, next, scheme) \ + list_for_each_entry_safe(f, next, &(scheme)->filters, list) + #ifdef CONFIG_DAMON =20 struct damon_region *damon_new_region(unsigned long start, unsigned long e= nd); @@ -536,6 +582,11 @@ void damon_destroy_region(struct damon_region *r, stru= ct damon_target *t); int damon_set_regions(struct damon_target *t, struct damon_addr_range *ran= ges, unsigned int nr_ranges); =20 +struct damos_filter *damos_new_filter(enum damos_filter_type type, + bool matching); +void damos_add_filter(struct damos *s, struct damos_filter *f); +void damos_destroy_filter(struct damos_filter *f); + struct damos *damon_new_scheme(struct damos_access_pattern *pattern, enum damos_action action, struct damos_quota *quota, struct damos_watermarks *wmarks); diff --git a/mm/damon/core.c b/mm/damon/core.c index 9cbcc143179e..d924657ad622 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -273,6 +273,40 @@ int damon_set_regions(struct damon_target *t, struct d= amon_addr_range *ranges, return 0; } =20 +struct damos_filter *damos_new_filter(enum damos_filter_type type, + bool matching) +{ + struct damos_filter *filter; + + filter =3D kmalloc(sizeof(*filter), GFP_KERNEL); + if (!filter) + return NULL; + filter->type =3D type; + filter->matching =3D matching; + return filter; +} + +void damos_add_filter(struct damos *s, struct damos_filter *f) +{ + list_add_tail(&f->list, &s->filters); +} + +static void damos_del_filter(struct damos_filter *f) +{ + list_del(&f->list); +} + +static void damos_free_filter(struct damos_filter *f) +{ + kfree(f); +} + +void damos_destroy_filter(struct damos_filter *f) +{ + damos_del_filter(f); + damos_free_filter(f); +} + /* initialize private fields of damos_quota and return the pointer */ static struct damos_quota *damos_quota_init_priv(struct damos_quota *quota) { @@ -297,6 +331,7 @@ struct damos *damon_new_scheme(struct damos_access_patt= ern *pattern, return NULL; scheme->pattern =3D *pattern; scheme->action =3D action; + INIT_LIST_HEAD(&scheme->filters); scheme->stat =3D (struct damos_stat){}; INIT_LIST_HEAD(&scheme->list); =20 @@ -325,6 +360,10 @@ static void damon_free_scheme(struct damos *s) =20 void damon_destroy_scheme(struct damos *s) { + struct damos_filter *f, *next; + + damos_for_each_filter_safe(f, next, s) + damos_destroy_filter(f); damon_del_scheme(s); damon_free_scheme(s); } --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92FCDC47089 for ; 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d=kernel.org; s=k20201202; t=1669838982; bh=A+37s6JJXYN+1C0NX4ExPJftU7PAKfFK4zc/BA9nVsg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aJTehjTN01AwdSRZIxWRXChbipb5IKA2UrcYJAqmQnUdb5pA7EkkQLdyPI/PW3qUc Qls2bOUz1Q6sdDSEhKow2+/4fVZroN/glCQClVUhMUgdQ5t3VoS83iiS/w8Yxo09nn CdJivAV8keHFdBzQHinNkD/ZyOeIS/Kozcs0CRE8jzQwi2YFH2IpLR3GEsO6vTYYNS GIQLQM6qqbOH1kuilz+GLI933zjCbDE+t8GezmKmu/txjY3YhO0xZPj676hBtTqIWR flgLSStWY1Z+c6TMRHuEws/WpWXPLO/hXtAkjr/q9tFcRgLumXS5AJ9GE6RxdctOS6 TyNjam9ZAGCPA== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 02/11] mm/damon/paddr: support DAMOS filters Date: Wed, 30 Nov 2022 20:09:28 +0000 Message-Id: <20221130200937.118005-3-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement support of the DAMOS filters in the physical address space monitoring operations set, for all DAMOS actions that it supports including 'pageout', 'lru_prio', and 'lru_deprio'. Signed-off-by: SeongJae Park --- mm/damon/paddr.c | 71 ++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 62 insertions(+), 9 deletions(-) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index e1a4315c4be6..ebd1905eed6f 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -202,7 +202,47 @@ static unsigned int damon_pa_check_accesses(struct dam= on_ctx *ctx) return max_nr_accesses; } =20 -static unsigned long damon_pa_pageout(struct damon_region *r) +static bool __damos_pa_filter_out(struct damos_filter *filter, + struct page *page) +{ + bool matched =3D false; + struct mem_cgroup *memcg; + + switch (filter->type) { + case DAMOS_FILTER_TYPE_ANON: + matched =3D PageAnon(page); + break; + case DAMOS_FILTER_TYPE_MEMCG: + rcu_read_lock(); + memcg =3D page_memcg_check(page); + if (!memcg) + matched =3D false; + else + matched =3D filter->memcg_id =3D=3D mem_cgroup_id(memcg); + rcu_read_unlock(); + break; + default: + break; + } + + return matched =3D=3D filter->matching; +} + +/* + * damos_pa_filter_out - Return true if the page should be filtered out. + */ +static bool damos_pa_filter_out(struct damos *scheme, struct page *page) +{ + struct damos_filter *filter; + + damos_for_each_filter(filter, scheme) { + if (__damos_pa_filter_out(filter, page)) + return true; + } + return false; +} + +static unsigned long damon_pa_pageout(struct damon_region *r, struct damos= *s) { unsigned long addr, applied; LIST_HEAD(page_list); @@ -213,6 +253,11 @@ static unsigned long damon_pa_pageout(struct damon_reg= ion *r) if (!page) continue; =20 + if (damos_pa_filter_out(s, page)) { + put_page(page); + continue; + } + ClearPageReferenced(page); test_and_clear_page_young(page); if (isolate_lru_page(page)) { @@ -232,7 +277,7 @@ static unsigned long damon_pa_pageout(struct damon_regi= on *r) } =20 static inline unsigned long damon_pa_mark_accessed_or_deactivate( - struct damon_region *r, bool mark_accessed) + struct damon_region *r, struct damos *s, bool mark_accessed) { unsigned long addr, applied =3D 0; =20 @@ -241,6 +286,12 @@ static inline unsigned long damon_pa_mark_accessed_or_= deactivate( =20 if (!page) continue; + + if (damos_pa_filter_out(s, page)) { + put_page(page); + continue; + } + if (mark_accessed) mark_page_accessed(page); else @@ -251,14 +302,16 @@ static inline unsigned long damon_pa_mark_accessed_or= _deactivate( return applied * PAGE_SIZE; } =20 -static unsigned long damon_pa_mark_accessed(struct damon_region *r) +static unsigned long damon_pa_mark_accessed(struct damon_region *r, + struct damos *s) { - return damon_pa_mark_accessed_or_deactivate(r, true); + return damon_pa_mark_accessed_or_deactivate(r, s, true); } =20 -static unsigned long damon_pa_deactivate_pages(struct damon_region *r) +static unsigned long damon_pa_deactivate_pages(struct damon_region *r, + struct damos *s) { - return damon_pa_mark_accessed_or_deactivate(r, false); + return damon_pa_mark_accessed_or_deactivate(r, s, false); } =20 static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx, @@ -267,11 +320,11 @@ static unsigned long damon_pa_apply_scheme(struct dam= on_ctx *ctx, { switch (scheme->action) { case DAMOS_PAGEOUT: - return damon_pa_pageout(r); + return damon_pa_pageout(r, scheme); case DAMOS_LRU_PRIO: - return damon_pa_mark_accessed(r); + return damon_pa_mark_accessed(r, scheme); case DAMOS_LRU_DEPRIO: - return damon_pa_deactivate_pages(r); + return damon_pa_deactivate_pages(r, scheme); case DAMOS_STAT: break; default: --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 49923C352A1 for ; Wed, 30 Nov 2022 20:10:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229879AbiK3UKA (ORCPT ); Wed, 30 Nov 2022 15:10:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229816AbiK3UJq (ORCPT ); Wed, 30 Nov 2022 15:09:46 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCCD88C6A1 for ; Wed, 30 Nov 2022 12:09:45 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8681CB81CD9 for ; Wed, 30 Nov 2022 20:09:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4E89C43146; Wed, 30 Nov 2022 20:09:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838983; bh=grt8f69Dz6AwyetZSMeMbFhewde1iaVMzadAT1LoRZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WLNVlXze66e6bJgKZEGO6XI9qKr/WWkt6nkzk1TBS/Zp1Ly0AijwDHo+ze1hiwAg8 IWldWCPVTjtow7pGt00n5zCRRKElawSyBxP+MSy8AZp7EjmkPhMyQa9tfE9qrQYQ8Y 5ERqWfkAUyirqLxgMNPSQ3kmrgyMEIrq9Qm7aJDQUiXLJQEI52w1/f21B2soeQUYtN OWALqy4zpatDyFmHUrVLOiWSqokxBiwwl0NylXbV4md41gQpUegL7x6yQswbiK2ZtB 8Zw46mBgzM5M42g+RpWukjcjOMYjgsei/DCOxhSOHXGQfogoPE724ciYkfcZladH5+ kdqd1DsjoGUWg== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 03/11] mm/damon/reclaim: add a parameter called skip_anon for avoiding anonymous pages reclamation Date: Wed, 30 Nov 2022 20:09:29 +0000 Message-Id: <20221130200937.118005-4-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In some cases, for example if users have confidence at anonymous pages management or the swap device is too slow, users would want to avoid DAMON_RECLAIM swapping the anonymous pages out. For such case, add yet another DAMON_RECLAIM parameter, namely 'skip_anon'. When it is set as 'Y', DAMON_RECLAIM will avoid reclaiming anonymous pages using a DAMOS filter. Signed-off-by: SeongJae Park --- mm/damon/reclaim.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index e82631f39481..648d2a85523a 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -98,6 +98,15 @@ module_param(monitor_region_start, ulong, 0600); static unsigned long monitor_region_end __read_mostly; module_param(monitor_region_end, ulong, 0600); =20 +/* + * Skip anonymous pages reclamation. + * + * If this parameter is set as ``Y``, DAMON_RECLAIM does not reclaim anony= mous + * pages. By default, ``N``. + */ +static bool skip_anon __read_mostly; +module_param(skip_anon, bool, 0600); + /* * PID of the DAMON thread * @@ -142,6 +151,7 @@ static struct damos *damon_reclaim_new_scheme(void) static int damon_reclaim_apply_parameters(void) { struct damos *scheme; + struct damos_filter *filter; int err =3D 0; =20 err =3D damon_set_attrs(ctx, &damon_reclaim_mon_attrs); @@ -152,6 +162,15 @@ static int damon_reclaim_apply_parameters(void) scheme =3D damon_reclaim_new_scheme(); if (!scheme) return -ENOMEM; + if (skip_anon) { + filter =3D damos_new_filter(DAMOS_FILTER_TYPE_ANON, true); + if (!filter) { + /* Will be freed by next 'damon_set_schemes()' below */ + damon_destroy_scheme(scheme); + return -ENOMEM; + } + damos_add_filter(scheme, filter); + } damon_set_schemes(ctx, &scheme, 1); =20 return damon_set_region_biggest_system_ram_default(target, --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98DFBC4708E for ; Wed, 30 Nov 2022 20:09:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229862AbiK3UJz (ORCPT ); Wed, 30 Nov 2022 15:09:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43692 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229807AbiK3UJp (ORCPT ); Wed, 30 Nov 2022 15:09:45 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 976418C6A1; Wed, 30 Nov 2022 12:09:44 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 329A961DB3; Wed, 30 Nov 2022 20:09:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7CE43C43470; Wed, 30 Nov 2022 20:09:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838984; bh=ew0j918CPCZ3BCkCfl4ilV0ZC0sdlaLXkkNEQyNFiwY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XsbL+COvjvgKot+WGk8Bh1WRZz9wpWt4QxI1jWnHQ/jgVRU2/BaOelw9lolBjfLR3 QuyMEav1UneZQ7KX6Sf9YHsC4PXGGzmDlUR8h5+UCmFG82UfT+l31rF38bUhYWgjfV xnh5oDuMGSpfh49FDo7tamV37HyCyqOLo7WIOqoV7IB1ZY3Zcenprk0xewGVhvXHmt kMQo3Y8sHjWjNtFKu0nhSSEpgu7HZpFwCbv1T6PhgFYvY97AIDC+Q8ELPYLaBHa3QM +Bt/qATHcq9FV4BaPZQuaPELjNt0gDnbJDd00kHwfj5uYMv3xVxnntP57vD2UAhv5P UV72nW8PC4oOQ== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: Jonathan Corbet , damon@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 04/11] Docs/admin-guide/damon/reclaim: document 'skip_anon' parameter Date: Wed, 30 Nov 2022 20:09:30 +0000 Message-Id: <20221130200937.118005-5-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Document the newly added 'skip_anon' parameter of DAMON_RECLAIM, which can be used to avoid anonymous pages reclamation. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/reclaim.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/admin-guide/mm/damon/reclaim.rst b/Documentation= /admin-guide/mm/damon/reclaim.rst index 4f1479a11e63..ff335e96e0d8 100644 --- a/Documentation/admin-guide/mm/damon/reclaim.rst +++ b/Documentation/admin-guide/mm/damon/reclaim.rst @@ -205,6 +205,15 @@ The end physical address of memory region that DAMON_R= ECLAIM will do work against. That is, DAMON_RECLAIM will find cold memory regions in this reg= ion and reclaims. By default, biggest System RAM is used as the region. =20 +skip_anon +--------- + +Skip anonymous pages reclamation. + +If this parameter is set as ``Y``, DAMON_RECLAIM does not reclaim anonymous +pages. By default, ``N``. + + kdamond_pid ----------- =20 --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2DC82C4321E for ; Wed, 30 Nov 2022 20:10:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229869AbiK3UJ6 (ORCPT ); Wed, 30 Nov 2022 15:09:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229812AbiK3UJp (ORCPT ); Wed, 30 Nov 2022 15:09:45 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08B5477223 for ; Wed, 30 Nov 2022 12:09:45 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id CD9E861DB5 for ; Wed, 30 Nov 2022 20:09:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36A8CC43144; Wed, 30 Nov 2022 20:09:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838984; bh=MpYV+KbY79xvzeBIqlzmkGgEI6XBAJRwIre/bGlDx34=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e7UUPXbSOHpt1n/DE7i2B73YdfoKw6GeVPStCb2hI8OyKJj6Vv0MkCFL7ZAkpbl6U ltLoStwxzZAKS66k9PC9EatWya0KWK28TnizMGZL/SQD4xfS8Fp8AWBprjzxe7r+7w 54WlIRoBZR4How2s06tKWMV469xxG8g0uMR+D/T02/YY/Cjx52vOOknjyz47rpytFt NhOmjV56/c/eN/2xVIJUaf/Lt9nralBjguIV69dWs+mK+IfjbPYQBo7zfQ05DGY+I5 TxQ1rfXFGrPE56NAqssborqgXGeaPSCP0D62PjJUl09F3ngA6AWwRYUT5TY9cdgV8B zQK8f5+4lTjrQ== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 05/11] mm/damon/sysfs-schemes: implement filters directory Date: Wed, 30 Nov 2022 20:09:31 +0000 Message-Id: <20221130200937.118005-6-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" DAMOS filters is currently supported by only DAMON kernel API. To expose the feature to user space, implement a DAMON sysfs directory named 'filters' under each scheme directory. Please note that this is implementing only the directory. Following commits will implement more files and directories, and finally connect the DAMOS filters feature. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 85 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 84 insertions(+), 1 deletion(-) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 81fc4d27f4e4..50c8148cb474 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -258,6 +258,63 @@ static struct kobj_type damon_sysfs_stats_ktype =3D { .default_groups =3D damon_sysfs_stats_groups, }; =20 +/* + * filters directory + */ + +struct damon_sysfs_scheme_filters { + struct kobject kobj; + int nr; +}; + +static struct damon_sysfs_scheme_filters * +damon_sysfs_scheme_filters_alloc(void) +{ + return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL); +} + +static ssize_t nr_filters_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_scheme_filters *filters =3D container_of(kobj, + struct damon_sysfs_scheme_filters, kobj); + + return sysfs_emit(buf, "%d\n", filters->nr); +} + +static ssize_t nr_filters_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + int nr, err =3D kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + return count; +} + +static void damon_sysfs_scheme_filters_release(struct kobject *kobj) +{ + kfree(container_of(kobj, struct damon_sysfs_scheme_filters, kobj)); +} + +static struct kobj_attribute damon_sysfs_scheme_filters_nr_attr =3D + __ATTR_RW_MODE(nr_filters, 0600); + +static struct attribute *damon_sysfs_scheme_filters_attrs[] =3D { + &damon_sysfs_scheme_filters_nr_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(damon_sysfs_scheme_filters); + +static struct kobj_type damon_sysfs_scheme_filters_ktype =3D { + .release =3D damon_sysfs_scheme_filters_release, + .sysfs_ops =3D &kobj_sysfs_ops, + .default_groups =3D damon_sysfs_scheme_filters_groups, +}; + /* * watermarks directory */ @@ -784,6 +841,7 @@ struct damon_sysfs_scheme { struct damon_sysfs_access_pattern *access_pattern; struct damon_sysfs_quotas *quotas; struct damon_sysfs_watermarks *watermarks; + struct damon_sysfs_scheme_filters *filters; struct damon_sysfs_stats *stats; struct damon_sysfs_scheme_regions *tried_regions; }; @@ -878,6 +936,24 @@ static int damon_sysfs_scheme_set_watermarks(struct da= mon_sysfs_scheme *scheme) return err; } =20 +static int damon_sysfs_scheme_set_filters(struct damon_sysfs_scheme *schem= e) +{ + struct damon_sysfs_scheme_filters *filters =3D + damon_sysfs_scheme_filters_alloc(); + int err; + + if (!filters) + return -ENOMEM; + err =3D kobject_init_and_add(&filters->kobj, + &damon_sysfs_scheme_filters_ktype, &scheme->kobj, + "filters"); + if (err) + kobject_put(&filters->kobj); + else + scheme->filters =3D filters; + return err; +} + static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_stats *stats =3D damon_sysfs_stats_alloc(); @@ -926,9 +1002,12 @@ static int damon_sysfs_scheme_add_dirs(struct damon_s= ysfs_scheme *scheme) err =3D damon_sysfs_scheme_set_watermarks(scheme); if (err) goto put_quotas_access_pattern_out; - err =3D damon_sysfs_scheme_set_stats(scheme); + err =3D damon_sysfs_scheme_set_filters(scheme); if (err) goto put_watermarks_quotas_access_pattern_out; + err =3D damon_sysfs_scheme_set_stats(scheme); + if (err) + goto put_filters_watermarks_quotas_access_pattern_out; err =3D damon_sysfs_scheme_set_tried_regions(scheme); if (err) goto put_tried_regions_out; @@ -937,6 +1016,9 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sy= sfs_scheme *scheme) put_tried_regions_out: kobject_put(&scheme->tried_regions->kobj); scheme->tried_regions =3D NULL; +put_filters_watermarks_quotas_access_pattern_out: + kobject_put(&scheme->filters->kobj); + scheme->filters =3D NULL; put_watermarks_quotas_access_pattern_out: kobject_put(&scheme->watermarks->kobj); scheme->watermarks =3D NULL; @@ -956,6 +1038,7 @@ static void damon_sysfs_scheme_rm_dirs(struct damon_sy= sfs_scheme *scheme) damon_sysfs_quotas_rm_dirs(scheme->quotas); kobject_put(&scheme->quotas->kobj); kobject_put(&scheme->watermarks->kobj); + kobject_put(&scheme->filters->kobj); kobject_put(&scheme->stats->kobj); damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions); kobject_put(&scheme->tried_regions->kobj); --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 326ACC4321E for ; Wed, 30 Nov 2022 20:10:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229895AbiK3UKD (ORCPT ); Wed, 30 Nov 2022 15:10:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229818AbiK3UJr (ORCPT ); Wed, 30 Nov 2022 15:09:47 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3175F900D1 for ; Wed, 30 Nov 2022 12:09:46 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C5D7961D9A for ; Wed, 30 Nov 2022 20:09:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D069EC4347C; Wed, 30 Nov 2022 20:09:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838985; bh=KP45fkenUtVNkuekA5wpVSKSKg+M620wUBu7fatA2gQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NTQWpYMfGiGnvkvcUD2hsgvAJoaLLAGpgORABV/99qrjSgvDSuLTsu8EWxEpxOkC8 Ra5tBL1hzv3XV1KCE8AOIShKvRHtuOtDrebbOYd+Pn29i9ABOsKtLVWpeDYUREwgQV Uh9STp9P2cC7/5m0d86YylFxX0JdbfnwNVyE+iQDB8QRo6E7JsJ6KulVXS3ZYFR1VI RuHc2GrW3qhJDPVbfW7QNkFu95kSKffTf+az7hHTAOAJf+6osimwHJ7FF15Te9OdbK QVDK8BWnZk0CagWCW3xh8lgPsiDMb1sm0nbT1EfNOu0ZWQOuoQ6j4lSsxAZ+0vzU+l 6nJiU15n2JW0w== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 06/11] mm/damon/sysfs-schemes: implement filter directory Date: Wed, 30 Nov 2022 20:09:32 +0000 Message-Id: <20221130200937.118005-7-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement DAMOS filter directory which will be located under the filters directory. The directory provides three files, namely type, matching, and memcg_path. 'type' and 'matching' will be directly connected to the fields of 'struct damos_filter' having same name. 'memcg_path' will receive the path of the memory cgroup of the interest and later converted to memcg id when it's committed. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 128 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 50c8148cb474..afbfc55a8e84 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -258,6 +258,134 @@ static struct kobj_type damon_sysfs_stats_ktype =3D { .default_groups =3D damon_sysfs_stats_groups, }; =20 +/* + * filter directory + */ + +struct damon_sysfs_scheme_filter { + struct kobject kobj; + enum damos_filter_type type; + bool matching; + char *memcg_path; +}; + +/* Should match with enum damos_filter_type */ +static const char * const damon_sysfs_scheme_filter_type_strs[] =3D { + "anon", + "memcg", +}; + +static ssize_t type_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_scheme_filter *filter =3D container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + + return sysfs_emit(buf, "%s\n", + damon_sysfs_scheme_filter_type_strs[filter->type]); +} + +static ssize_t type_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_scheme_filter *filter =3D container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + enum damos_filter_type type; + ssize_t ret =3D -EINVAL; + + for (type =3D 0; type < NR_DAMOS_FILTER_TYPES; type++) { + if (sysfs_streq(buf, damon_sysfs_scheme_filter_type_strs[ + type])) { + filter->type =3D type; + ret =3D count; + break; + } + } + return ret; +} + +static ssize_t matching_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_scheme_filter *filter =3D container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + + return sysfs_emit(buf, "%c\n", filter->matching ? 'Y' : 'N'); +} + +static ssize_t matching_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_scheme_filter *filter =3D container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + bool matching; + int err =3D kstrtobool(buf, &matching); + + if (err) + return err; + + filter->matching =3D matching; + return count; +} + +static ssize_t memcg_path_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_scheme_filter *filter =3D container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + + return sysfs_emit(buf, "%s\n", + filter->memcg_path ? filter->memcg_path : ""); +} + +static ssize_t memcg_path_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_scheme_filter *filter =3D container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + char *path =3D kmalloc(sizeof(*path) * (count + 1), GFP_KERNEL); + + if (!path) + return -ENOMEM; + + strncpy(path, buf, count); + path[count] =3D '\0'; + filter->memcg_path =3D path; + return count; +} + +static void damon_sysfs_scheme_filter_release(struct kobject *kobj) +{ + struct damon_sysfs_scheme_filter *filter =3D container_of(kobj, + struct damon_sysfs_scheme_filter, kobj); + + kfree(filter->memcg_path); + kfree(filter); +} + +static struct kobj_attribute damon_sysfs_scheme_filter_type_attr =3D + __ATTR_RW_MODE(type, 0600); + +static struct kobj_attribute damon_sysfs_scheme_filter_matching_attr =3D + __ATTR_RW_MODE(matching, 0600); + +static struct kobj_attribute damon_sysfs_scheme_filter_memcg_path_attr =3D + __ATTR_RW_MODE(memcg_path, 0600); + +static struct attribute *damon_sysfs_scheme_filter_attrs[] =3D { + &damon_sysfs_scheme_filter_type_attr.attr, + &damon_sysfs_scheme_filter_matching_attr.attr, + &damon_sysfs_scheme_filter_memcg_path_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(damon_sysfs_scheme_filter); + +static struct kobj_type damon_sysfs_scheme_filter_ktype =3D { + .release =3D damon_sysfs_scheme_filter_release, + .sysfs_ops =3D &kobj_sysfs_ops, + .default_groups =3D damon_sysfs_scheme_filter_groups, +}; + /* * filters directory */ --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 663E9C4321E for ; Wed, 30 Nov 2022 20:10:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229838AbiK3UKG (ORCPT ); Wed, 30 Nov 2022 15:10:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43722 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229823AbiK3UJr (ORCPT ); Wed, 30 Nov 2022 15:09:47 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DAD2D77223 for ; Wed, 30 Nov 2022 12:09:46 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6268761DB5 for ; Wed, 30 Nov 2022 20:09:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CE31C433B5; Wed, 30 Nov 2022 20:09:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838985; bh=5gMO8cLybx9rIEkN5/YUfJzDl3RNG0bek/qaVakfGfg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fyEPngwuZpVCPKj0e4uOCSDx1BCpnCetVtcL2MqZ+HTFvvcTE+G86n+1jV6SP+6EO XZmbJPiZlX613JojRgXLTRSeb2MhX6AL1OsbR3a2aZJ5FoS7f9NRCK58qGKpvjNkRh ssiEsUhB0xW1+ku46FANT3BoQsRClM2BgOSZ1Tx1Qvw+5jZpi651bYaEP5HIqDCb3N GlYxUZI0asZT/EOpSD9bhKm6kfPLyNbmM9X1Ei6uhIpAqkJCO+tJJWA/X3EOW0BcBB +eiRVYe6zTRYYJ/iul6USKYxNXgTARb6RrYExJqSvZc+jkFtC8mF4Wl0J9uaCNTLdw H0ApioDCwbF1Q== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 07/11] mm/damon/sysfs-schemes: connect filter directory and filters directory Date: Wed, 30 Nov 2022 20:09:33 +0000 Message-Id: <20221130200937.118005-8-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement 'nr_filters' file under 'filters' directory, which will be used to populate specific number of 'filter' directory under the directory, similar to other 'nr_*' files in DAMON sysfs interface. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 68 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index afbfc55a8e84..e79c678a69d5 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -269,6 +269,11 @@ struct damon_sysfs_scheme_filter { char *memcg_path; }; =20 +static struct damon_sysfs_scheme_filter *damon_sysfs_scheme_filter_alloc(v= oid) +{ + return kzalloc(sizeof(struct damon_sysfs_scheme_filter), GFP_KERNEL); +} + /* Should match with enum damos_filter_type */ static const char * const damon_sysfs_scheme_filter_type_strs[] =3D { "anon", @@ -392,6 +397,7 @@ static struct kobj_type damon_sysfs_scheme_filter_ktype= =3D { =20 struct damon_sysfs_scheme_filters { struct kobject kobj; + struct damon_sysfs_scheme_filter **filters_arr; int nr; }; =20 @@ -401,6 +407,57 @@ damon_sysfs_scheme_filters_alloc(void) return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL); } =20 +static void damon_sysfs_scheme_filters_rm_dirs( + struct damon_sysfs_scheme_filters *filters) +{ + struct damon_sysfs_scheme_filter **filters_arr =3D filters->filters_arr; + int i; + + for (i =3D 0; i < filters->nr; i++) + kobject_put(&filters_arr[i]->kobj); + filters->nr =3D 0; + kfree(filters_arr); + filters->filters_arr =3D NULL; +} + +static int damon_sysfs_scheme_filters_add_dirs( + struct damon_sysfs_scheme_filters *filters, int nr_filters) +{ + struct damon_sysfs_scheme_filter **filters_arr, *filter; + int err, i; + + damon_sysfs_scheme_filters_rm_dirs(filters); + if (!nr_filters) + return 0; + + filters_arr =3D kmalloc_array(nr_filters, sizeof(*filters_arr), + GFP_KERNEL | __GFP_NOWARN); + if (!filters_arr) + return -ENOMEM; + filters->filters_arr =3D filters_arr; + + for (i =3D 0; i < nr_filters; i++) { + filter =3D damon_sysfs_scheme_filter_alloc(); + if (!filter) { + damon_sysfs_scheme_filters_rm_dirs(filters); + return -ENOMEM; + } + + err =3D kobject_init_and_add(&filter->kobj, + &damon_sysfs_scheme_filter_ktype, + &filters->kobj, "%d", i); + if (err) { + kobject_put(&filter->kobj); + damon_sysfs_scheme_filters_rm_dirs(filters); + return err; + } + + filters_arr[i] =3D filter; + filters->nr++; + } + return 0; +} + static ssize_t nr_filters_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -413,6 +470,7 @@ static ssize_t nr_filters_show(struct kobject *kobj, static ssize_t nr_filters_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { + struct damon_sysfs_scheme_filters *filters; int nr, err =3D kstrtoint(buf, 0, &nr); =20 if (err) @@ -420,6 +478,15 @@ static ssize_t nr_filters_store(struct kobject *kobj, if (nr < 0) return -EINVAL; =20 + filters =3D container_of(kobj, struct damon_sysfs_scheme_filters, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err =3D damon_sysfs_scheme_filters_add_dirs(filters, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + return count; } =20 @@ -1166,6 +1233,7 @@ static void damon_sysfs_scheme_rm_dirs(struct damon_s= ysfs_scheme *scheme) damon_sysfs_quotas_rm_dirs(scheme->quotas); kobject_put(&scheme->quotas->kobj); kobject_put(&scheme->watermarks->kobj); + damon_sysfs_scheme_filters_rm_dirs(scheme->filters); kobject_put(&scheme->filters->kobj); kobject_put(&scheme->stats->kobj); damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions); --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EAA58C4321E for ; Wed, 30 Nov 2022 20:10:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229928AbiK3UKR (ORCPT ); Wed, 30 Nov 2022 15:10:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229831AbiK3UJu (ORCPT ); Wed, 30 Nov 2022 15:09:50 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE2B69135F for ; Wed, 30 Nov 2022 12:09:48 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id AF5CEB81CD4 for ; Wed, 30 Nov 2022 20:09:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07B3CC433D7; Wed, 30 Nov 2022 20:09:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838986; bh=np2Yu8Q2x8gtS0MXr5n11c7mRGrlDAkmbbQ8z9YhO6Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nDZWQCv37cmXsYFuxYM0g0H2ZjJowAriJKZo8FsXKWLj8qlWolYjcXjJhwvkk3d+c KQSwHfNNcGPzZhiYi+zZjbJjkFTHjbJf7r6/nufM6eSWVZAfIlpIFd7m3Ba6KrSoFx HieZTIPofdbQ2oSR1BigvrpLdka6+X3JdbGGuK+F3IRvKeVn3NyejfBiTQCZwxG4he uq6BJqRPwkHZM8YbBFPfp5cFD8PUxZLtp6VZUDb5vJCKw/IoqD1LHcZkYxfnEc3hXM 2H/w2J1I2+5UBCRXz4Zma5Jiw0jomnS5mTxTgUWV/8P/pWXT5PVtGDoUN8RSlL3+Gn x/mC1E2bxhKQg== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 08/11] mm/damon/sysfs-schemes: implement scheme filters Date: Wed, 30 Nov 2022 20:09:34 +0000 Message-Id: <20221130200937.118005-9-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement scheme filters functionality of DAMON sysfs interface by making the code reads the values of files under the filter directories and pass that to DAMON using DAMON kernel API. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 89 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 88 insertions(+), 1 deletion(-) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index e79c678a69d5..0501862534f2 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1403,6 +1403,75 @@ struct kobj_type damon_sysfs_schemes_ktype =3D { .default_groups =3D damon_sysfs_schemes_groups, }; =20 +static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg, + char *memcg_path_buf, char *path) +{ +#ifdef CONFIG_MEMCG + cgroup_path(memcg->css.cgroup, memcg_path_buf, PATH_MAX); + if (sysfs_streq(memcg_path_buf, path)) + return true; +#endif /* CONFIG_MEMCG */ + return false; +} + +static int damon_sysfs_memcg_path_to_id(char *memcg_path, unsigned short *= id) +{ + struct mem_cgroup *memcg; + char *path; + + if (!memcg_path) + return -EINVAL; + + path =3D kmalloc(sizeof(*path) * PATH_MAX, GFP_KERNEL); + if (!path) + return -ENOMEM; + + for (memcg =3D mem_cgroup_iter(NULL, NULL, NULL); memcg; + memcg =3D mem_cgroup_iter(NULL, memcg, NULL)) { + /* skip removed memcg */ + if (!mem_cgroup_id(memcg)) + continue; + if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) { + *id =3D mem_cgroup_id(memcg); + break; + } + } + + kfree(path); + return 0; +} + +static int damon_sysfs_set_scheme_filters(struct damos *scheme, + struct damon_sysfs_scheme_filters *sysfs_filters) +{ + int i; + struct damos_filter *filter, *next; + + damos_for_each_filter_safe(filter, next, scheme) + damos_destroy_filter(filter); + + for (i =3D 0; i < sysfs_filters->nr; i++) { + struct damon_sysfs_scheme_filter *sysfs_filter =3D + sysfs_filters->filters_arr[i]; + struct damos_filter *filter =3D + damos_new_filter(sysfs_filter->type, + sysfs_filter->matching); + int err; + + if (!filter) + return -ENOMEM; + if (filter->type =3D=3D DAMOS_FILTER_TYPE_MEMCG) { + err =3D damon_sysfs_memcg_path_to_id( + sysfs_filter->memcg_path, + &filter->memcg_id); + if (err) + return err; + } + damos_add_filter(scheme, filter); + } + return 0; +} + static struct damos *damon_sysfs_mk_scheme( struct damon_sysfs_scheme *sysfs_scheme) { @@ -1411,6 +1480,10 @@ static struct damos *damon_sysfs_mk_scheme( struct damon_sysfs_quotas *sysfs_quotas =3D sysfs_scheme->quotas; struct damon_sysfs_weights *sysfs_weights =3D sysfs_quotas->weights; struct damon_sysfs_watermarks *sysfs_wmarks =3D sysfs_scheme->watermarks; + struct damon_sysfs_scheme_filters *sysfs_filters =3D + sysfs_scheme->filters; + struct damos *scheme; + int err; =20 struct damos_access_pattern pattern =3D { .min_sz_region =3D access_pattern->sz->min, @@ -1436,8 +1509,17 @@ static struct damos *damon_sysfs_mk_scheme( .low =3D sysfs_wmarks->low, }; =20 - return damon_new_scheme(&pattern, sysfs_scheme->action, "a, + scheme =3D damon_new_scheme(&pattern, sysfs_scheme->action, "a, &wmarks); + if (!scheme) + return NULL; + + err =3D damon_sysfs_set_scheme_filters(scheme, sysfs_filters); + if (err) { + damon_destroy_scheme(scheme); + return NULL; + } + return scheme; } =20 static void damon_sysfs_update_scheme(struct damos *scheme, @@ -1448,6 +1530,7 @@ static void damon_sysfs_update_scheme(struct damos *s= cheme, struct damon_sysfs_quotas *sysfs_quotas =3D sysfs_scheme->quotas; struct damon_sysfs_weights *sysfs_weights =3D sysfs_quotas->weights; struct damon_sysfs_watermarks *sysfs_wmarks =3D sysfs_scheme->watermarks; + int err; =20 scheme->pattern.min_sz_region =3D access_pattern->sz->min; scheme->pattern.max_sz_region =3D access_pattern->sz->max; @@ -1470,6 +1553,10 @@ static void damon_sysfs_update_scheme(struct damos *= scheme, scheme->wmarks.high =3D sysfs_wmarks->high; scheme->wmarks.mid =3D sysfs_wmarks->mid; scheme->wmarks.low =3D sysfs_wmarks->low; + + err =3D damon_sysfs_set_scheme_filters(scheme, sysfs_scheme->filters); + if (err) + damon_destroy_scheme(scheme); } =20 int damon_sysfs_set_schemes(struct damon_ctx *ctx, --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 876ABC4321E for ; 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s=k20201202; t=1669838987; bh=qgpIYxCoLxiSbmookPCEJSX95mijzZoDksXEWue5IhI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ph1+PQPZYu6to+v4+E7MJsXG71DdCfottZMxf1eZpKiRNy4oCyTaMkgg7vIjsTWfd zMoWUqXoDWvNEBc0SXOkA4kCbcz8+t/yk+iMNwmT2Un1nhaDleVV8d+NV40r6ftxFj cxwH/mphoi9jaylPCjBmsFX3CMsKSYtVmfsXEzVqvsWNcpVFcrTW+ZEB67mk9YGLv3 W3mh7bEz/PuxeV5DmQzgOSjK/tDXQOeP7Ga1mIlO5ES80sVZ8vV4i+f8DRDnA3LTnS EtP2kTMnYfhQeCLR8axup+u4wdlSNN+bgwsXC3Q71oVMYx0c/72Z8Ngh4GMbBzYA1Y JDRI5XE0qxaHQ== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: Shuah Khan , damon@lists.linux.dev, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 09/11] selftests/damon/sysfs: test filters directory Date: Wed, 30 Nov 2022 20:09:35 +0000 Message-Id: <20221130200937.118005-10-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add simple test cases for scheme filters of DAMON sysfs interface. The test cases check if the files are populated as expected, receives some valid inputs, and refuses some invalid inputs. Signed-off-by: SeongJae Park --- tools/testing/selftests/damon/sysfs.sh | 29 ++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/tools/testing/selftests/damon/sysfs.sh b/tools/testing/selftes= ts/damon/sysfs.sh index db4942383a50..a00336ffdcad 100644 --- a/tools/testing/selftests/damon/sysfs.sh +++ b/tools/testing/selftests/damon/sysfs.sh @@ -96,6 +96,34 @@ test_stats() done } =20 +test_filter() +{ + filter_dir=3D$1 + ensure_file "$filter_dir/type" "exist" "600" + ensure_write_succ "$filter_dir/type" "anon" "valid input" + ensure_write_succ "$filter_dir/type" "memcg" "valid input" + ensure_write_fail "$filter_dir/type" "foo" "invalid input" + ensure_file "$filter_dir/matching" "exist" "600" + ensure_file "$filter_dir/memcg_path" "exist" "600" +} + +test_filters() +{ + filters_dir=3D$1 + ensure_dir "$filters_dir" "exist" + ensure_file "$filters_dir/nr_filters" "exist" "600" + ensure_write_succ "$filters_dir/nr_filters" "1" "valid input" + test_filter "$filters_dir/0" + + ensure_write_succ "$filters_dir/nr_filters" "2" "valid input" + test_filter "$filters_dir/0" + test_filter "$filters_dir/1" + + ensure_write_succ "$filters_dir/nr_filters" "0" "valid input" + ensure_dir "$filters_dir/0" "not_exist" + ensure_dir "$filters_dir/1" "not_exist" +} + test_watermarks() { watermarks_dir=3D$1 @@ -143,6 +171,7 @@ test_scheme() test_access_pattern "$scheme_dir/access_pattern" test_quotas "$scheme_dir/quotas" test_watermarks "$scheme_dir/watermarks" + test_filters "$scheme_dir/filters" test_stats "$scheme_dir/stats" test_tried_regions "$scheme_dir/tried_regions" } --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5AA7BC47089 for ; Wed, 30 Nov 2022 20:10:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229938AbiK3UKW (ORCPT ); Wed, 30 Nov 2022 15:10:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229832AbiK3UJu (ORCPT ); Wed, 30 Nov 2022 15:09:50 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3F4B91360; Wed, 30 Nov 2022 12:09:48 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9162861DA4; Wed, 30 Nov 2022 20:09:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66471C43146; Wed, 30 Nov 2022 20:09:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838987; bh=r1rD9KyNMBqJg8aGe8o3Z8JXG+myDQ882BtgLSHPqNo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RFzWrAf4PAnp9Ebgo1QWOr+HKWbJmkSKwTKSucLkXV2ylmhJ4SrtmQX93z5/aOm3z WPDjofJdvcUPp6O+vdUuuvsPlFaNCSnojT8JdYzeHgOFKai6H+1o5Bos9c4zfdpJJ6 53N2NsG8cxMUniXjE8Cx3hOJizULVJjjrK4aQcgjAHrnj0vgCQBgcbEi2VwjKLGFML iVK45j6pM0D4c4UsOpAiSToCQJGTeR4byKkL9vghzlYZ0xIeZSK5oT7qadPPFod9z1 nemD4nvmaR0ba0hr8h8fNf5RFy2+0/iMGPuVFlZkjHVRJGdHOqFYNKa46pk0njabG8 f39eYe3O+Vmzw== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: Jonathan Corbet , damon@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 10/11] Docs/admin-guide/mm/damon/usage: document DAMOS filters of sysfs Date: Wed, 30 Nov 2022 20:09:36 +0000 Message-Id: <20221130200937.118005-11-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Document about the newly added files for DAMOS filters on the DAMON usage document. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 48 +++++++++++++++++++- 1 file changed, 46 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/a= dmin-guide/mm/damon/usage.rst index 1a5b6b71efa1..3d82ca6a17ff 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -87,6 +87,8 @@ comma (","). :: =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = quotas/ms,bytes,reset_interval_ms =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 weights/sz_permil,nr_accesses_permil,age_permil =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = watermarks/metric,interval_us,high,mid,low + =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = filters/nr_filters + =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 0/type,matching,memcg_id =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = tried_regions/ =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 0/start,end,nr_accesses,age @@ -151,6 +153,8 @@ number (``N``) to the file creates the number of child = directories named as moment, only one context per kdamond is supported, so only ``0`` or ``1`` = can be written to the file. =20 +.. _sysfs_contexts: + contexts// ------------- =20 @@ -268,8 +272,8 @@ schemes// ------------ =20 In each scheme directory, five directories (``access_pattern``, ``quotas``, -``watermarks``, ``stats``, and ``tried_regions``) and one file (``action``) -exist. +``watermarks``, ``filters``, ``stats``, and ``tried_regions``) and one file +(``action``) exist. =20 The ``action`` file is for setting and getting what action you want to app= ly to memory regions having specific access pattern of the interest. The keywor= ds @@ -347,6 +351,46 @@ as below. =20 The ``interval`` should written in microseconds unit. =20 +schemes//filters/ +-------------------- + +Users could know something more than the kernel for specific types of memo= ry. +In the case, users could do their own management for the memory and hence +doesn't want DAMOS bothers that. Users could limit DAMOS by setting the a= ccess +pattern of the scheme and/or the monitoring regions for the purpose, but t= hat +can be inefficient in some cases. In such cases, users could set non-acce= ss +pattern driven filters using files in this directory. + +In the beginning, this directory has only one file, ``nr_filters``. Writi= ng a +number (``N``) to the file creates the number of child directories named `= `0`` +to ``N-1``. Each directory represents each filter. The filters are evalu= ated +in the numeric order. + +Each filter directory contains three files, namely ``type``, ``matcing``, = and +``memcg_path``. You can write one of two special keywords, ``anon`` for +anonymous pages, or ``memcg`` for specific memory cgroup filtering. In ca= se of +the memory cgroup filtering, you can specify the memory cgroup of the inte= rest +by writing the path of the memory cgroup from the cgroups mount point to +``memcg_path`` file. You can write ``Y`` or ``N`` to ``matching`` file to +filter out pages that does or does not match to the type, respectively. T= hen, +the scheme's action will not be applied to the pages that specified to be +filtered out. + +For example, below restricts a DAMOS action to be applied to only non-anon= ymous +pages of all memory cgroups except ``/having_care_already``.:: + + # echo 2 > nr_filters + # # filter out anonymous pages + echo anon > 0/type + echo Y > 0/matching + # # further filter out all cgroups except one at '/having_care_already' + echo memcg > 1/type + echo /having_care_already > 1/memcg_path + echo N > 1/matching + +Note that filters could be ignored depend on the running DAMON operations = set +`implementation `. + .. _sysfs_schemes_stats: =20 schemes//stats/ --=20 2.25.1 From nobody Sat Dec 14 18:49:55 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F4DDC4321E for ; Wed, 30 Nov 2022 20:10:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229948AbiK3UK2 (ORCPT ); Wed, 30 Nov 2022 15:10:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229843AbiK3UJw (ORCPT ); Wed, 30 Nov 2022 15:09:52 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 376F99135E for ; Wed, 30 Nov 2022 12:09:51 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id D9027B81CDF for ; Wed, 30 Nov 2022 20:09:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26F02C4314A; Wed, 30 Nov 2022 20:09:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838988; bh=wsgdvbT/35uxHZu2m3onVtLPaAGvmOTx9y/8CzTLOOI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JsatvoLDGeust/Jc03yigWF7AvQ4atAVKdWFKmE0dNZWBmpzz9ZHKZE4BvRsHU9Fi aV7fgIgKo9O+fZIG0rh8nbbzE71dMlsVwQPPORO4oVbGXRx0r7IapuM6n4aC4pHszS 9IikxmcflQtlRhbJ55u2cAJ3LARyqvHi3/Z4oQ/D31HNWPpGBZ4Ldjo1ZJ2W/Db0Nz 82U+K1uZf+ifNulP0brCg3y9wejFhyh+XGQMM6SobcVMsN/TEgHvpL1k6ANkAIVSQw R0Qngx7chuYTIL2suKnj5btccse85/tHNBxifStrsSfPI4F9FPSsrMZZMwlTR6SGd4 2xoJ99lIMtsBA== From: SeongJae Park To: Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [RFC PATCH v2 11/11] Docs/ABI/damon: document scheme filters files Date: Wed, 30 Nov 2022 20:09:37 +0000 Message-Id: <20221130200937.118005-12-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Document newly added DAMON sysfs interface files for DAMOS filtering on the DAMON ABI document. Signed-off-by: SeongJae Park --- .../ABI/testing/sysfs-kernel-mm-damon | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-damon b/Documentatio= n/ABI/testing/sysfs-kernel-mm-damon index 13397b853692..2744f21b5a6b 100644 --- a/Documentation/ABI/testing/sysfs-kernel-mm-damon +++ b/Documentation/ABI/testing/sysfs-kernel-mm-damon @@ -258,6 +258,35 @@ Contact: SeongJae Park Description: Writing to and reading from this file sets and gets the low watermark of the scheme in permil. =20 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters/nr_filters +Date: Dec 2022 +Contact: SeongJae Park +Description: Writing a number 'N' to this file creates the number of + directories for setting filters of the scheme named '0' to + 'N-1' under the filters/ directory. + +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//type +Date: Dec 2022 +Contact: SeongJae Park +Description: Writing to and reading from this file sets and gets the type = of + the memory of the interest. 'anon' for anonymous pages, or + 'memcg' for specific memory cgroup can be written and read. + +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//memcg_path +Date: Dec 2022 +Contact: SeongJae Park +Description: If 'memcg' is written to the 'type' file, writing to and + reading from this file sets and gets the path to the memory + cgroup of the interest. + +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//matching +Date: Dec 2022 +Contact: SeongJae Park +Description: Writing 'Y' or 'N' to this file sets whether to filter out + pages that do or do not match to the 'type' and 'memcg_path', + respectively. Filter out means the action of the scheme will + not be applied to. + What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//st= ats/nr_tried Date: Mar 2022 Contact: SeongJae Park --=20 2.25.1