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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>
This commit is contained in:
SeongJae Park 2025-07-16 22:54:46 -07:00 committed by Andrew Morton
parent b907494768
commit d809a7c64b
1 changed files with 29 additions and 0 deletions
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29
mm/damon/sysfs.c
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@ -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;
}