The patch titled Subject: samples: add a skeleton of a sample DAMON module for working set size estimation has been added to the -mm mm-unstable branch. Its filename is samples-add-a-skeleton-of-a-sample-damon-module-for-working-set-size-estimation.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/samples-add-a-skeleton-of-a-sample-damon-module-for-working-set-size-estimation.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: SeongJae Park <sj@xxxxxxxxxx> Subject: samples: add a skeleton of a sample DAMON module for working set size estimation Date: Tue, 10 Dec 2024 13:50:26 -0800 Patch series "mm/damon: add sample modules". Implement a proactive cold memory regions reclaiming logic of prcl sample module using DAMOS. The logic treats memory regions that not accessed at all for five or more seconds as cold, and reclaim those as soon as found. This patch (of 5): Add a skeleton for a sample DAMON static module that can be used for estimating working set size of a given process. Note that it is a static module since DAMON is not exporting symbols to loadable modules for now. It exposes two module parameters, namely 'pid' and 'enable'. 'pid' will specify the process that the module will estimate the working set size of. 'enable' will receive whether to start or stop the estimation. Because this is just a skeleton, the parameters do nothing, though. The functionalities will be implemented by following commits. Link: https://lkml.kernel.org/r/20241210215030.85675-1-sj@xxxxxxxxxx Link: https://lkml.kernel.org/r/20241210215030.85675-2-sj@xxxxxxxxxx Signed-off-by: SeongJae Park <sj@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- MAINTAINERS | 1 samples/Kconfig | 2 + samples/Makefile | 1 samples/damon/Kconfig | 17 ++++++++++ samples/damon/Makefile | 3 + samples/damon/wsse.c | 65 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 89 insertions(+) --- a/MAINTAINERS~samples-add-a-skeleton-of-a-sample-damon-module-for-working-set-size-estimation +++ a/MAINTAINERS @@ -6328,6 +6328,7 @@ 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/ DAVICOM FAST ETHERNET (DMFE) NETWORK DRIVER diff --git a/samples/damon/Kconfig a/samples/damon/Kconfig new file mode 100644 --- /dev/null +++ a/samples/damon/Kconfig @@ -0,0 +1,17 @@ +# SPDX-License-Identifier: GPL-2.0 + +menu "DAMON Samples" + +config SAMPLE_DAMON_WSSE + bool "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 a pid, monitor access to the virtual address + space of the process, estimate working set size of the process, and + repeatedly prints the size on the kernel log. + + If unsure, say N. + +endmenu diff --git a/samples/damon/Makefile a/samples/damon/Makefile new file mode 100644 --- /dev/null +++ a/samples/damon/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_SAMPLE_DAMON_WSSE) += wsse.o diff --git a/samples/damon/wsse.c a/samples/damon/wsse.c new file mode 100644 --- /dev/null +++ a/samples/damon/wsse.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * working set size estimation: monitor access pattern of given process and + * print estimated working set size (total size of regions that showing some + * access). + */ + +#define pr_fmt(fmt) "damon_sample_wsse: " fmt + +#include <linux/damon.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> + +static int target_pid __read_mostly; +module_param(target_pid, int, 0600); + +static int damon_sample_wsse_enable_store( + const char *val, const struct kernel_param *kp); + +static const struct kernel_param_ops enable_param_ops = { + .set = damon_sample_wsse_enable_store, + .get = param_get_bool, +}; + +static bool enable __read_mostly; +module_param_cb(enable, &enable_param_ops, &enable, 0600); +MODULE_PARM_DESC(enable, "Enable or disable DAMON_SAMPLE_WSSE"); + +static int damon_sample_wsse_start(void) +{ + pr_info("start\n"); + return 0; +} + +static void damon_sample_wsse_stop(void) +{ + pr_info("stop\n"); +} + +static int damon_sample_wsse_enable_store( + const char *val, const struct kernel_param *kp) +{ + bool enabled = enable; + int err; + + err = kstrtobool(val, &enable); + if (err) + return err; + + if (enable == enabled) + return 0; + + if (enable) + return damon_sample_wsse_start(); + damon_sample_wsse_stop(); + return 0; +} + +static int __init damon_sample_wsse_init(void) +{ + return 0; +} + +module_init(damon_sample_wsse_init); --- a/samples/Kconfig~samples-add-a-skeleton-of-a-sample-damon-module-for-working-set-size-estimation +++ a/samples/Kconfig @@ -293,6 +293,8 @@ config SAMPLE_CGROUP source "samples/rust/Kconfig" +source "samples/damon/Kconfig" + endif # SAMPLES config HAVE_SAMPLE_FTRACE_DIRECT --- a/samples/Makefile~samples-add-a-skeleton-of-a-sample-damon-module-for-working-set-size-estimation +++ a/samples/Makefile @@ -39,3 +39,4 @@ obj-$(CONFIG_SAMPLE_KMEMLEAK) += kmemle obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) += coresight/ obj-$(CONFIG_SAMPLE_FPROBE) += fprobe/ obj-$(CONFIG_SAMPLES_RUST) += rust/ +obj-$(CONFIG_SAMPLE_DAMON_WSSE) += damon/ _ Patches currently in -mm which might be from sj@xxxxxxxxxx are samples-add-a-skeleton-of-a-sample-damon-module-for-working-set-size-estimation.patch samples-damon-wsse-start-and-stop-damon-as-the-user-requests.patch samples-damon-wsse-implement-working-set-size-estimation-and-logging.patch samples-damon-introduce-a-skeleton-of-a-smaple-damon-module-for-proactive-reclamation.patch samples-damon-prcl-implement-schemes-setup.patch