From nobody Sun Dec 14 02:06:07 2025 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 D1753C4167B for ; Mon, 11 Dec 2023 14:09:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343754AbjLKOJP (ORCPT ); Mon, 11 Dec 2023 09:09:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33926 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343834AbjLKOIt (ORCPT ); Mon, 11 Dec 2023 09:08:49 -0500 Received: from mail-qt1-x82c.google.com (mail-qt1-x82c.google.com [IPv6:2607:f8b0:4864:20::82c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCC2D6580; Mon, 11 Dec 2023 06:04:39 -0800 (PST) Received: by mail-qt1-x82c.google.com with SMTP id d75a77b69052e-42594f0ca09so21224911cf.0; Mon, 11 Dec 2023 06:04:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1702303479; x=1702908279; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Fjv3xaAwIYR0bV7vWv+aqP2iMgmrLsGsg7noubEWJU0=; b=AxcbH9TBcUyokcTyPFtqCWDBeAefxnzAVozu4LvhES6BsUVncMUiJaeRaIW4kkM4V6 UxqvxjmHF6s0nIyVH+l0TydCOwywL8NdnZipiPyD0c3+mTbLmHGBlAlZaMs1f+HapbVV U10zSJknWLbNiOoaOuQvdqlBxnkPSgXvF29EV4dhHU4yxwtjXcgyHiXqatNHyDtciguy zFborbplN9SgizdkrseA0si74+GLLv/6a5/OWwyFTmHPtAu1vi5YV/UolMyjCPjbfRQV jSqlTCv6iOhqpo4kUzSgBKxo/YHjorZ2ZkJTtgO68+do35w8gnQ8GMUBAPITDbp+aGp8 hzlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702303479; x=1702908279; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Fjv3xaAwIYR0bV7vWv+aqP2iMgmrLsGsg7noubEWJU0=; b=cCpvOuNUTG+Z4CRgsGEIEObXBfiwmrCePgAWgA/R3U4yRxfZOhiN34QYgYKhTR1LSk Fo/Zkb1XatlCE7UXGu3z20UtgdR5SMF2y7Dv0Wc71SFgo73WMdm62tXqMRqgIQcXDEtm u26Ih6yV1B81n+iCaWTNi9tEw2qPhj83In5SRDMe/WlQlmvh15NWPHCywl5jPFzm9eWZ U/wzRfbtVsEOqxne2/EjYS3bwEjxSLp1a7MbnhcYKt9e9WdKZ0Ot7pM9H5+wXTQRP+dx WHKOQRv72rUSLo0Hl2tFQwY3Jw3r4a1BVLYkJccMYuaTJYeNHRrMBrZF3Mp1oLv3qa/a wu+A== X-Gm-Message-State: AOJu0YyoyLXQnQ/CdOm34OSkKddQqnyaflpH52Y0tbRhkKXGCJR7BCG3 1wx0V1XDB3d7bpMV+wCv+S4= X-Google-Smtp-Source: AGHT+IF1HX3JHdwq2GaOCTk9P4s+U/GdIY1YVtlNRng0dWHJJC3DxlF+r8Rtb94zL7GDHDFVqmzLjQ== X-Received: by 2002:a05:622a:1207:b0:425:a6dd:b997 with SMTP id y7-20020a05622a120700b00425a6ddb997mr2984093qtx.132.1702303478657; Mon, 11 Dec 2023 06:04:38 -0800 (PST) Received: from localhost ([2620:10d:c091:400::5:45f0]) by smtp.gmail.com with ESMTPSA id j25-20020ac874d9000000b004257e4c5e21sm3201635qtr.28.2023.12.11.06.04.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Dec 2023 06:04:38 -0800 (PST) From: Dan Schatzberg To: Johannes Weiner , Roman Gushchin , Yosry Ahmed , Huan Yang Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Tejun Heo , Zefan Li , Jonathan Corbet , Michal Hocko , Shakeel Butt , Muchun Song , Andrew Morton , David Hildenbrand , Matthew Wilcox , Chris Li , Kefeng Wang , "Vishal Moola (Oracle)" , Yue Zhao , Hugh Dickins Subject: [PATCH V3 1/1] mm: add swapiness= arg to memory.reclaim Date: Mon, 11 Dec 2023 06:04:15 -0800 Message-Id: <20231211140419.1298178-2-schatzberg.dan@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231211140419.1298178-1-schatzberg.dan@gmail.com> References: <20231211140419.1298178-1-schatzberg.dan@gmail.com> 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" Allow proactive reclaimers to submit an additional swappiness=3D argument to memory.reclaim. This overrides the global or per-memcg swappiness setting for that reclaim attempt. For example: echo "2M swappiness=3D0" > /sys/fs/cgroup/memory.reclaim will perform reclaim on the rootcg with a swappiness setting of 0 (no swap) regardless of the vm.swappiness sysctl setting. Signed-off-by: Dan Schatzberg --- Documentation/admin-guide/cgroup-v2.rst | 15 ++++++- include/linux/swap.h | 3 +- mm/memcontrol.c | 55 ++++++++++++++++++++----- mm/vmscan.c | 13 +++++- 4 files changed, 70 insertions(+), 16 deletions(-) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-= guide/cgroup-v2.rst index 3f85254f3cef..fc2b379dbd0f 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1282,8 +1282,8 @@ PAGE_SIZE multiple when read back. This is a simple interface to trigger memory reclaim in the target cgroup. =20 - This file accepts a single key, the number of bytes to reclaim. - No nested keys are currently supported. + This file accepts a string which containers thhe number of bytes + to reclaim. =20 Example:: =20 @@ -1304,6 +1304,17 @@ PAGE_SIZE multiple when read back. This means that the networking layer will not adapt based on reclaim induced by memory.reclaim. =20 + This file also allows the user to specify the swappiness value + to be used for the reclaim. For example: + + echo "1G swappiness=3D60" > memory.reclaim + + The above instructs the kernel to perform the reclaim with + a swappiness value of 60. Note that this has the same semantics + as the vm.swappiness sysctl - it sets the relative IO cost of + reclaiming anon vs file memory but does not allow for reclaiming + specific amounts of anon or file memory. + memory.peak A read-only single value file which exists on non-root cgroups. diff --git a/include/linux/swap.h b/include/linux/swap.h index f6dd6575b905..ebc20d094609 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -410,7 +410,8 @@ extern unsigned long try_to_free_pages(struct zonelist = *zonelist, int order, extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg, unsigned long nr_pages, gfp_t gfp_mask, - unsigned int reclaim_options); + unsigned int reclaim_options, + int swappiness); extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem, gfp_t gfp_mask, bool noswap, pg_data_t *pgdat, diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 1c1061df9cd1..74598c17d3cc 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -63,6 +63,7 @@ #include #include #include +#include #include #include "internal.h" #include @@ -2449,7 +2450,7 @@ static unsigned long reclaim_high(struct mem_cgroup *= memcg, psi_memstall_enter(&pflags); nr_reclaimed +=3D try_to_free_mem_cgroup_pages(memcg, nr_pages, gfp_mask, - MEMCG_RECLAIM_MAY_SWAP); + MEMCG_RECLAIM_MAY_SWAP, -1); psi_memstall_leave(&pflags); } while ((memcg =3D parent_mem_cgroup(memcg)) && !mem_cgroup_is_root(memcg)); @@ -2740,7 +2741,7 @@ static int try_charge_memcg(struct mem_cgroup *memcg,= gfp_t gfp_mask, =20 psi_memstall_enter(&pflags); nr_reclaimed =3D try_to_free_mem_cgroup_pages(mem_over_limit, nr_pages, - gfp_mask, reclaim_options); + gfp_mask, reclaim_options, -1); psi_memstall_leave(&pflags); =20 if (mem_cgroup_margin(mem_over_limit) >=3D nr_pages) @@ -3660,7 +3661,7 @@ static int mem_cgroup_resize_max(struct mem_cgroup *m= emcg, } =20 if (!try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, - memsw ? 0 : MEMCG_RECLAIM_MAY_SWAP)) { + memsw ? 0 : MEMCG_RECLAIM_MAY_SWAP, -1)) { ret =3D -EBUSY; break; } @@ -3774,7 +3775,7 @@ static int mem_cgroup_force_empty(struct mem_cgroup *= memcg) return -EINTR; =20 if (!try_to_free_mem_cgroup_pages(memcg, 1, GFP_KERNEL, - MEMCG_RECLAIM_MAY_SWAP)) + MEMCG_RECLAIM_MAY_SWAP, -1)) nr_retries--; } =20 @@ -6720,7 +6721,7 @@ static ssize_t memory_high_write(struct kernfs_open_f= ile *of, } =20 reclaimed =3D try_to_free_mem_cgroup_pages(memcg, nr_pages - high, - GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP); + GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP, -1); =20 if (!reclaimed && !nr_retries--) break; @@ -6769,7 +6770,7 @@ static ssize_t memory_max_write(struct kernfs_open_fi= le *of, =20 if (nr_reclaims) { if (!try_to_free_mem_cgroup_pages(memcg, nr_pages - max, - GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP)) + GFP_KERNEL, MEMCG_RECLAIM_MAY_SWAP, -1)) nr_reclaims--; continue; } @@ -6895,6 +6896,16 @@ static ssize_t memory_oom_group_write(struct kernfs_= open_file *of, return nbytes; } =20 +enum { + MEMORY_RECLAIM_SWAPPINESS =3D 0, + MEMORY_RECLAIM_NULL, +}; + +static const match_table_t if_tokens =3D { + { MEMORY_RECLAIM_SWAPPINESS, "swappiness=3D%d"}, + { MEMORY_RECLAIM_NULL, NULL }, +}; + static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf, size_t nbytes, loff_t off) { @@ -6902,12 +6913,33 @@ static ssize_t memory_reclaim(struct kernfs_open_fi= le *of, char *buf, unsigned int nr_retries =3D MAX_RECLAIM_RETRIES; unsigned long nr_to_reclaim, nr_reclaimed =3D 0; unsigned int reclaim_options; - int err; + char *old_buf, *start; + substring_t args[MAX_OPT_ARGS]; + int swappiness =3D -1; =20 buf =3D strstrip(buf); - err =3D page_counter_memparse(buf, "", &nr_to_reclaim); - if (err) - return err; + + old_buf =3D buf; + nr_to_reclaim =3D memparse(buf, &buf) / PAGE_SIZE; + if (buf =3D=3D old_buf) + return -EINVAL; + + buf =3D strstrip(buf); + + while ((start =3D strsep(&buf, " ")) !=3D NULL) { + if (!strlen(start)) + continue; + switch (match_token(start, if_tokens, args)) { + case MEMORY_RECLAIM_SWAPPINESS: + if (match_int(&args[0], &swappiness)) + return -EINVAL; + if (swappiness < 0 || swappiness > 200) + return -EINVAL; + break; + default: + return -EINVAL; + } + } =20 reclaim_options =3D MEMCG_RECLAIM_MAY_SWAP | MEMCG_RECLAIM_PROACTIVE; while (nr_reclaimed < nr_to_reclaim) { @@ -6926,7 +6958,8 @@ static ssize_t memory_reclaim(struct kernfs_open_file= *of, char *buf, =20 reclaimed =3D try_to_free_mem_cgroup_pages(memcg, min(nr_to_reclaim - nr_reclaimed, SWAP_CLUSTER_MAX), - GFP_KERNEL, reclaim_options); + GFP_KERNEL, reclaim_options, + swappiness); =20 if (!reclaimed && !nr_retries--) return -EAGAIN; diff --git a/mm/vmscan.c b/mm/vmscan.c index 506f8220c5fe..a20965b20177 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -136,6 +136,9 @@ struct scan_control { /* Always discard instead of demoting to lower tier memory */ unsigned int no_demotion:1; =20 + /* Swappiness value for reclaim, if -1 use memcg/global value */ + int swappiness; + /* Allocation order */ s8 order; =20 @@ -2327,7 +2330,8 @@ static void get_scan_count(struct lruvec *lruvec, str= uct scan_control *sc, struct pglist_data *pgdat =3D lruvec_pgdat(lruvec); struct mem_cgroup *memcg =3D lruvec_memcg(lruvec); unsigned long anon_cost, file_cost, total_cost; - int swappiness =3D mem_cgroup_swappiness(memcg); + int swappiness =3D sc->swappiness !=3D -1 ? + sc->swappiness : mem_cgroup_swappiness(memcg); u64 fraction[ANON_AND_FILE]; u64 denominator =3D 0; /* gcc */ enum scan_balance scan_balance; @@ -2608,6 +2612,9 @@ static int get_swappiness(struct lruvec *lruvec, stru= ct scan_control *sc) mem_cgroup_get_nr_swap_pages(memcg) < MIN_LRU_BATCH) return 0; =20 + if (sc->swappiness !=3D -1) + return sc->swappiness; + return mem_cgroup_swappiness(memcg); } =20 @@ -6433,7 +6440,8 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgrou= p *memcg, unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg, unsigned long nr_pages, gfp_t gfp_mask, - unsigned int reclaim_options) + unsigned int reclaim_options, + int swappiness) { unsigned long nr_reclaimed; unsigned int noreclaim_flag; @@ -6448,6 +6456,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem= _cgroup *memcg, .may_unmap =3D 1, .may_swap =3D !!(reclaim_options & MEMCG_RECLAIM_MAY_SWAP), .proactive =3D !!(reclaim_options & MEMCG_RECLAIM_PROACTIVE), + .swappiness =3D swappiness, }; /* * Traverse the ZONELIST_FALLBACK zonelist of the current node to put --=20 2.34.1