From nobody Wed Dec 17 22:42:33 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 21EA6C54FB9 for ; Tue, 21 Nov 2023 05:36:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233578AbjKUFgv (ORCPT ); Tue, 21 Nov 2023 00:36:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233397AbjKUFg0 (ORCPT ); Tue, 21 Nov 2023 00:36:26 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67EF9D79 for ; Mon, 20 Nov 2023 21:36:16 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B6E5C433CA; Tue, 21 Nov 2023 05:36:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700544976; bh=NQFkESlGtOo/Z9kTwMOTiB8dRtXYj2d4RmPD6fS+g6Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RuE6wR8s0cxItHT3S4v7846HvTe8lzcB2GDG2usS3By8VthmMpudVeqd8U8fNOrH6 om/JguB2ZLBLI0bLl3U0NAX7CceryPzzMnPfR9xGRaLfqRcFNiwfDwT6pIaxcK9SV2 /gtAtDGnJLSTZWk4xkjlCYg3LX7ai4cL0RyKBkq+yp0G0UxgmQX4v/PETr61S7jvDV 4nMxnm3stGHrnb5XnaXTX5vUlk6CkAFUrSa3qGPDhGNIbTnPrtfGYVcfJaIZJWZOYF cME8q3NrmRl3KKcqTti1PJTJ0zNtx7K3SPeH9JonPLtlYq4UYPPx/AVKO6uoc1hiFc X13VXI4G9j19Q== From: SeongJae Park Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/2] mm/damon/core: export symbols for supporting loadable modules Date: Tue, 21 Nov 2023 05:36:02 +0000 Message-Id: <20231121053604.60798-2-sj@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231121053604.60798-1-sj@kernel.org> References: <20231121053604.60798-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Expose DAMON core symbols for supporting minimum functionality from loadable modules. Signed-off-by: SeongJae Park --- mm/damon/core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index c080a16f6bdd..8ab8c902b9e2 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -111,6 +111,7 @@ int damon_select_ops(struct damon_ctx *ctx, enum damon_= ops_id id) mutex_unlock(&damon_ops_lock); return err; } +EXPORT_SYMBOL(damon_select_ops); =20 /* * Construct a damon_region struct @@ -353,6 +354,7 @@ struct damos *damon_new_scheme(struct damos_access_patt= ern *pattern, =20 return scheme; } +EXPORT_SYMBOL(damon_new_scheme); =20 static void damos_set_next_apply_sis(struct damos *s, struct damon_ctx *ct= x) { @@ -390,6 +392,7 @@ void damon_destroy_scheme(struct damos *s) damon_del_scheme(s); damon_free_scheme(s); } +EXPORT_SYMBOL(damon_destroy_scheme); =20 /* * Construct a damon_target struct @@ -411,11 +414,13 @@ struct damon_target *damon_new_target(void) =20 return t; } +EXPORT_SYMBOL(damon_new_target); =20 void damon_add_target(struct damon_ctx *ctx, struct damon_target *t) { list_add_tail(&t->list, &ctx->adaptive_targets); } +EXPORT_SYMBOL(damon_add_target); =20 bool damon_targets_empty(struct damon_ctx *ctx) { @@ -493,6 +498,7 @@ struct damon_ctx *damon_new_ctx(void) =20 return ctx; } +EXPORT_SYMBOL(damon_new_ctx); =20 static void damon_destroy_targets(struct damon_ctx *ctx) { @@ -518,6 +524,7 @@ void damon_destroy_ctx(struct damon_ctx *ctx) =20 kfree(ctx); } +EXPORT_SYMBOL(damon_destroy_ctx); =20 static unsigned int damon_age_for_new_attrs(unsigned int age, struct damon_attrs *old_attrs, struct damon_attrs *new_attrs) @@ -645,6 +652,7 @@ void damon_set_schemes(struct damon_ctx *ctx, struct da= mos **schemes, for (i =3D 0; i < nr_schemes; i++) damon_add_scheme(ctx, schemes[i]); } +EXPORT_SYMBOL(damon_set_schemes); =20 /** * damon_nr_running_ctxs() - Return number of currently running contexts. @@ -748,6 +756,7 @@ int damon_start(struct damon_ctx **ctxs, int nr_ctxs, b= ool exclusive) =20 return err; } +EXPORT_SYMBOL(damon_start); =20 /* * __damon_stop() - Stops monitoring of a given context. @@ -791,6 +800,7 @@ int damon_stop(struct damon_ctx **ctxs, int nr_ctxs) } return err; } +EXPORT_SYMBOL(damon_stop); =20 /* * Reset the aggregated monitoring results ('nr_accesses' of each region). --=20 2.34.1 From nobody Wed Dec 17 22:42:33 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 9873BC54FB9 for ; Tue, 21 Nov 2023 05:36:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233588AbjKUFgz (ORCPT ); Tue, 21 Nov 2023 00:36:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233471AbjKUFg2 (ORCPT ); Tue, 21 Nov 2023 00:36:28 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07832D7B for ; Mon, 20 Nov 2023 21:36:17 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35AFDC433CC; Tue, 21 Nov 2023 05:36:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700544976; bh=xeB5Q/0nCB1T8mGIogEvXwiHT5yYGJPGjYRZafQD3vs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XRqUqenpLitbMJv0BlMtg1ANbPQdVT7r8XE2BBmQvFEbs0CRkYq0X8FWuePv05Ssh zZMUKayZf5fuJpRq0xuuw+UDavlWbGYYMIlttP9kxAKic+0yazEGZwtIQC4U+gcS0T l8oA8ZFf+XFQGdlpPlkzZqZNJIT5+9eTLr9C1tKglZZTvjAgKWvxZX+8ntE2TjPc/b bUb3wn7Hp4IsOKdHMZ+Vd3LjLC8DARb0mZj3k0ZRWcSKzukE+8NWFlsuF8ohrLovPc OpMI+7hDqmDnMN9hAznF+p2jw/uQ+VdkUt4CCfUkcSlTQvS7xblyFDBVM9WX6OEQwK jkVNLt1do6gUA== From: SeongJae Park Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/2] samples: add DAMON sample kernel modules Date: Tue, 21 Nov 2023 05:36:03 +0000 Message-Id: <20231121053604.60798-3-sj@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231121053604.60798-1-sj@kernel.org> References: <20231121053604.60798-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add sample DAMON application kernel modules that same to the example kernel modules that presented at kernel summit 2021 with 10 minutes live coding[1] but updated for the latest DAMON interface. Specifically, add two sample modules, namely damon_sample_wsse and damon_sample_prcl. 'damon_sample_wsse' receives a pid of a process to monitor the access, monitors the access to the virtual address space of the process, calculate estimated working set size, and repeatedly print it on the kernel log. 'damon_sample_prcl' is similar to 'damon_sample_wsse', but find regions that not accessed and proactively reclaim those using DAMOS. [1] https://linuxplumbersconf.org/event/11/contributions/984/ Signed-off-by: SeongJae Park --- MAINTAINERS | 1 + samples/Kconfig | 2 + samples/Makefile | 2 + samples/damon/Kconfig | 30 ++++++++++ samples/damon/Makefile | 3 + samples/damon/damon_sample_prcl.c | 98 +++++++++++++++++++++++++++++++ samples/damon/damon_sample_wsse.c | 80 +++++++++++++++++++++++++ 7 files changed, 216 insertions(+) create mode 100644 samples/damon/Kconfig create mode 100644 samples/damon/Makefile create mode 100644 samples/damon/damon_sample_prcl.c create mode 100644 samples/damon/damon_sample_wsse.c diff --git a/MAINTAINERS b/MAINTAINERS index 6eedc85a013b..3ee99307229a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5781,6 +5781,7 @@ F: Documentation/mm/damon/ F: include/linux/damon.h F: include/trace/events/damon.h F: mm/damon/ +F: samples/damon/ F: tools/testing/selftests/damon/ =20 DAVICOM FAST ETHERNET (DMFE) NETWORK DRIVER diff --git a/samples/Kconfig b/samples/Kconfig index b0ddf5f36738..1e3f1b33b3d8 100644 --- a/samples/Kconfig +++ b/samples/Kconfig @@ -287,6 +287,8 @@ config SAMPLE_KMEMLEAK =20 source "samples/rust/Kconfig" =20 +source "samples/damon/Kconfig" + endif # SAMPLES =20 config HAVE_SAMPLE_FTRACE_DIRECT diff --git a/samples/Makefile b/samples/Makefile index 0a551c2b33f4..ae863e7c5250 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -38,3 +38,5 @@ obj-$(CONFIG_SAMPLE_KMEMLEAK) +=3D kmemleak/ obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) +=3D coresight/ obj-$(CONFIG_SAMPLE_FPROBE) +=3D fprobe/ obj-$(CONFIG_SAMPLES_RUST) +=3D rust/ +obj-$(CONFIG_SAMPLE_DAMON_WSSE) +=3D damon/ +obj-$(CONFIG_SAMPLE_DAMON_PRCL) +=3D damon/ diff --git a/samples/damon/Kconfig b/samples/damon/Kconfig new file mode 100644 index 000000000000..459042ce5958 --- /dev/null +++ b/samples/damon/Kconfig @@ -0,0 +1,30 @@ +# SPDX-License-Identifier: GPL-2.0 + +menu "DAMON Samples" + +config SAMPLE_DAMON_WSSE + tristate "DAMON sameple module for working set size estimation" + depends on DAMON && DAMON_VADDR + help + This builds DAMON sample module for working set size estimation. + + The module receives pid of a process, monitor access to the virtual + address space of the process, calculate the estimated working set + size of the process, and repeatedly print the size on the kernel log. + + If unsure, say N. + +config SAMPLE_DAMON_PRCL + tristate "DAMON sameple module for access-aware proactive reclamation" + depends on DAMON && DAMON_VADDR + help + This builds DAMON sample module for access-aware proactive + reclamation. + + The module receives pid of a process, monitor access to the virtual + address space of the process, find memory regions that not accessed, + and proactively reclaim the regions. + + If unsure, say N. + +endmenu diff --git a/samples/damon/Makefile b/samples/damon/Makefile new file mode 100644 index 000000000000..df102e8c2b7b --- /dev/null +++ b/samples/damon/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SAMPLE_DAMON_WSSE) +=3D damon_sample_wsse.o +obj-$(CONFIG_SAMPLE_DAMON_PRCL) +=3D damon_sample_prcl.o diff --git a/samples/damon/damon_sample_prcl.c b/samples/damon/damon_sample= _prcl.c new file mode 100644 index 000000000000..962b3309e490 --- /dev/null +++ b/samples/damon/damon_sample_prcl.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 + +#define pr_fmt(fmt) "damon_sample_prcl: " fmt + +#include +#include +#include +#include + +static int target_pid __read_mostly; +module_param(target_pid, int, 0600); + +static struct damon_ctx *ctx; +static struct pid *target_pidp; + +static int damon_sample_prcl_after_aggregate(struct damon_ctx *c) +{ + struct damon_target *t; + + damon_for_each_target(t, c) { + struct damon_region *r; + unsigned long wss =3D 0; + + damon_for_each_region(r, t) { + if (r->nr_accesses > 0) + wss +=3D r->ar.end - r->ar.start; + } + pr_info("wss: %lu\n", wss); + } + return 0; +} + +static int __init damon_sample_prcl_init(void) +{ + struct damon_target *target; + struct damos *scheme; + + pr_info("Hello\n"); + + ctx =3D damon_new_ctx(); + if (!ctx) + return -ENOMEM; + if (damon_select_ops(ctx, DAMON_OPS_VADDR)) { + damon_destroy_ctx(ctx); + return -EINVAL; + } + + target =3D damon_new_target(); + if (!target) { + damon_destroy_ctx(ctx); + return -ENOMEM; + } + damon_add_target(ctx, target); + target_pidp =3D find_get_pid(target_pid); + if (!target_pidp) { + damon_destroy_ctx(ctx); + return -EINVAL; + } + target->pid =3D target_pidp; + + ctx->callback.after_aggregation =3D damon_sample_prcl_after_aggregate; + + scheme =3D damon_new_scheme( + &(struct damos_access_pattern) { + .min_sz_region =3D PAGE_SIZE, + .max_sz_region =3D ULONG_MAX, + .min_nr_accesses =3D 0, + .max_nr_accesses =3D 0}, + DAMOS_PAGEOUT, + 0, + &(struct damos_quota){}, + &(struct damos_watermarks){}); + if (!scheme) { + damon_destroy_ctx(ctx); + return -ENOMEM; + } + damon_set_schemes(ctx, &scheme, 1); + + return damon_start(&ctx, 1, true); +} + +static void __exit damon_sample_prcl_exit(void) +{ + pr_info("Goodbye\n"); + if (ctx) { + damon_stop(&ctx, 1); + damon_destroy_ctx(ctx); + } + if (target_pidp) + put_pid(target_pidp); +} + +module_init(damon_sample_prcl_init); +module_exit(damon_sample_prcl_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("SeongJae Park"); +MODULE_DESCRIPTION("DAMON sample module for proactive reclamation"); diff --git a/samples/damon/damon_sample_wsse.c b/samples/damon/damon_sample= _wsse.c new file mode 100644 index 000000000000..7bfbd2bf56aa --- /dev/null +++ b/samples/damon/damon_sample_wsse.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0 + +#define pr_fmt(fmt) "damon_sample_wsse: " fmt + +#include +#include +#include +#include + +static int target_pid __read_mostly; +module_param(target_pid, int, 0600); + +static struct damon_ctx *ctx; +static struct pid *target_pidp; + +static int damon_sample_wsse_after_aggregate(struct damon_ctx *c) +{ + struct damon_target *t; + + damon_for_each_target(t, c) { + struct damon_region *r; + unsigned long wss =3D 0; + + damon_for_each_region(r, t) { + if (r->nr_accesses > 0) + wss +=3D r->ar.end - r->ar.start; + } + pr_info("wss: %lu\n", wss); + } + return 0; +} + +static int __init damon_sample_wsse_init(void) +{ + struct damon_target *target; + + pr_info("Hello\n"); + + ctx =3D damon_new_ctx(); + if (!ctx) + return -ENOMEM; + if (damon_select_ops(ctx, DAMON_OPS_VADDR)) { + damon_destroy_ctx(ctx); + return -EINVAL; + } + + target =3D damon_new_target(); + if (!target) { + damon_destroy_ctx(ctx); + return -ENOMEM; + } + damon_add_target(ctx, target); + target_pidp =3D find_get_pid(target_pid); + if (!target_pidp) { + damon_destroy_ctx(ctx); + return -EINVAL; + } + target->pid =3D target_pidp; + + ctx->callback.after_aggregation =3D damon_sample_wsse_after_aggregate; + return damon_start(&ctx, 1, true); +} + +static void __exit damon_sample_wsse_exit(void) +{ + pr_info("Goodbye\n"); + if (ctx) { + damon_stop(&ctx, 1); + damon_destroy_ctx(ctx); + } + if (target_pidp) + put_pid(target_pidp); +} + +module_init(damon_sample_wsse_init); +module_exit(damon_sample_wsse_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("SeongJae Park"); +MODULE_DESCRIPTION("DAMON sample module for working set size estimation"); --=20 2.34.1