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mm/damon/reclaim: fix the timer always stays active

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The timer stays active even if the reclaim mechanism is never enabled.  It
is unnecessary overhead can be completely avoided by using
module_param_cb() for enabled flag.

Link: https://lkml.kernel.org/r/20220421125910.1052459-1-tuhailong@gmail.com
Signed-off-by: Hailong Tu <tuhailong@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hailong Tu 2022-04-29 14:37:00 -07:00 committed by akpm
parent cef4493f1a
commit 059342d1dd
1 changed files with 25 additions and 2 deletions
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27
mm/damon/reclaim.c
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@ -28,7 +28,6 @@
* this. * this.
*/ */
static bool enabled __read_mostly; static bool enabled __read_mostly;
module_param(enabled, bool, 0600);
/* /*
* Time threshold for cold memory regions identification in microseconds. * Time threshold for cold memory regions identification in microseconds.
@ -358,11 +357,35 @@ static void damon_reclaim_timer_fn(struct work_struct *work)
enabled = last_enabled; enabled = last_enabled;
} }
schedule_delayed_work(&damon_reclaim_timer, if (enabled)
schedule_delayed_work(&damon_reclaim_timer,
msecs_to_jiffies(ENABLE_CHECK_INTERVAL_MS)); msecs_to_jiffies(ENABLE_CHECK_INTERVAL_MS));
} }
static DECLARE_DELAYED_WORK(damon_reclaim_timer, damon_reclaim_timer_fn); static DECLARE_DELAYED_WORK(damon_reclaim_timer, damon_reclaim_timer_fn);
static int enabled_store(const char *val,
const struct kernel_param *kp)
{
int rc = param_set_bool(val, kp);
if (rc < 0)
return rc;
if (enabled)
schedule_delayed_work(&damon_reclaim_timer, 0);
return 0;
}
static const struct kernel_param_ops enabled_param_ops = {
.set = enabled_store,
.get = param_get_bool,
};
module_param_cb(enabled, &enabled_param_ops, &enabled, 0600);
MODULE_PARM_DESC(enabled,
"Enable or disable DAMON_RECLAIM (default: disabled)");
static int damon_reclaim_after_aggregation(struct damon_ctx *c) static int damon_reclaim_after_aggregation(struct damon_ctx *c)
{ {
struct damos *s; struct damos *s;