The patch titled
Subject: samples/damon/wsse: start and stop DAMON as the user requests
has been added to the -mm mm-unstable branch. Its filename is
samples-damon-wsse-start-and-stop-damon-as-the-user-requests.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/samples-damon-wsse-start-and-stop-damon-as-the-user-requests.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: SeongJae Park <sj@xxxxxxxxxx>
Subject: samples/damon/wsse: start and stop DAMON as the user requests
Date: Tue, 10 Dec 2024 13:50:27 -0800
Start running DAMON to monitor accesses of a process that the user
specified via 'target_pid' parameter, when 'y' is passed to 'enable'
parameter. Stop running DAMON when 'n' is passed to 'enable' parameter.
Estimating the working set size from DAMON's monitoring results and
reporting it to the user will be implemented by the following commit.
Link: https://lkml.kernel.org/r/20241210215030.85675-3-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
samples/damon/wsse.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)
--- a/samples/damon/wsse.c~samples-damon-wsse-start-and-stop-damon-as-the-user-requests
+++ a/samples/damon/wsse.c
@@ -27,15 +27,48 @@ 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 struct damon_ctx *ctx;
+static struct pid *target_pidp;
+
static int damon_sample_wsse_start(void)
{
+ struct damon_target *target;
+
pr_info("start\n");
- return 0;
+
+ ctx = damon_new_ctx();
+ if (!ctx)
+ return -ENOMEM;
+ if (damon_select_ops(ctx, DAMON_OPS_VADDR)) {
+ damon_destroy_ctx(ctx);
+ return -EINVAL;
+ }
+
+ target = damon_new_target();
+ if (!target) {
+ damon_destroy_ctx(ctx);
+ return -ENOMEM;
+ }
+ damon_add_target(ctx, target);
+ target_pidp = find_get_pid(target_pid);
+ if (!target_pidp) {
+ damon_destroy_ctx(ctx);
+ return -EINVAL;
+ }
+ target->pid = target_pidp;
+
+ return damon_start(&ctx, 1, true);
}
static void damon_sample_wsse_stop(void)
{
pr_info("stop\n");
+ if (ctx) {
+ damon_stop(&ctx, 1);
+ damon_destroy_ctx(ctx);
+ }
+ if (target_pidp)
+ put_pid(target_pidp);
}
static int damon_sample_wsse_enable_store(
_
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
