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authorSeongJae Park <sj@kernel.org>2025-07-16 22:54:46 -0700
committerAndrew Morton <akpm@linux-foundation.org>2025-07-24 19:12:33 -0700
commitd809a7c64ba8229286b333c0cba03b1cdfb50238 (patch)
tree42b38b28508444cdc9d15a83da5d1227b035c90f
parentmm/damon/sysfs: implement refresh_ms file under kdamond directory (diff)
downloadwireguard-linux-d809a7c64ba8229286b333c0cba03b1cdfb50238.tar.xz
wireguard-linux-d809a7c64ba8229286b333c0cba03b1cdfb50238.zip
mm/damon/sysfs: implement refresh_ms file internal work
Only minimum file operations for refresh_ms file is implemented. Further implement its designed behavior, the periodic essential files content update, using repeat mode damon_call(). If non-zero value is written to the file, update DAMON sysfs files for auto-tuned monitoring intervals, DAMOS stats, and auto-tuned DAMOS quota values, which are essential to be monitored in most DAMON use cases. The user-written non-zero value becomes the time delay between the update. If zero is written to the file, the periodic refresh is disabled. Link: https://lkml.kernel.org/r/20250717055448.56976-3-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--mm/damon/sysfs.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 4296dc201f4d..6d2b0dab50cb 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1509,6 +1509,32 @@ static struct damon_ctx *damon_sysfs_build_ctx(
return ctx;
}
+static int damon_sysfs_repeat_call_fn(void *data)
+{
+ struct damon_sysfs_kdamond *sysfs_kdamond = data;
+ static unsigned long next_update_jiffies;
+
+ if (!sysfs_kdamond->refresh_ms)
+ return 0;
+ if (time_before(jiffies, next_update_jiffies))
+ return 0;
+ next_update_jiffies = jiffies +
+ msecs_to_jiffies(sysfs_kdamond->refresh_ms);
+
+ if (!mutex_trylock(&damon_sysfs_lock))
+ return 0;
+ damon_sysfs_upd_tuned_intervals(sysfs_kdamond);
+ damon_sysfs_upd_schemes_stats(sysfs_kdamond);
+ damon_sysfs_upd_schemes_effective_quotas(sysfs_kdamond);
+ mutex_unlock(&damon_sysfs_lock);
+ return 0;
+}
+
+static struct damon_call_control damon_sysfs_repeat_call_control = {
+ .fn = damon_sysfs_repeat_call_fn,
+ .repeat = true,
+};
+
static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond *kdamond)
{
struct damon_ctx *ctx;
@@ -1533,6 +1559,9 @@ static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond *kdamond)
return err;
}
kdamond->damon_ctx = ctx;
+
+ damon_sysfs_repeat_call_control.data = kdamond;
+ damon_call(ctx, &damon_sysfs_repeat_call_control);
return err;
}