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mm/damon/reclaim: implement user-feedback driven quota auto-tuning 

DAMOS supports user-feedback driven quota auto-tuning, but only DAMON
sysfs interface is using it.  Add support of the feature on DAMON_RECLAIM
by adding one more input parameter, namely 'quota_autotune_feedback', for
providing the user feedback to DAMON_RECLAIM.  It assumes the target value
of the feedback is 10,000.

Link: https://lkml.kernel.org/r/20240219194431.159606-19-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2024-02-19 11:44:29 -08:00 committed by Andrew Morton
parent 57e88e86a1
commit 58dea17d7a
1 changed files with 28 additions and 0 deletions
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28
mm/damon/reclaim.c
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@ -62,6 +62,21 @@ static struct damos_quota damon_reclaim_quota = {
};
DEFINE_DAMON_MODULES_DAMOS_QUOTAS(damon_reclaim_quota);
/*
* User-specifiable feedback for auto-tuning of the effective quota.
*
* While keeping the caps that set by other quotas, DAMON_RECLAIM automatically
* increases and decreases the effective level of the quota aiming receiving this
* feedback of value ``10,000`` from the user. DAMON_RECLAIM assumes the feedback
* value and the quota are positively proportional. Value zero means disabling
* this auto-tuning feature.
*
* Disabled by default.
*
*/
static unsigned long quota_autotune_feedback __read_mostly;
module_param(quota_autotune_feedback, ulong, 0600);
static struct damos_watermarks damon_reclaim_wmarks = {
.metric = DAMOS_WMARK_FREE_MEM_RATE,
.interval = 5000000, /* 5 seconds */
@ -159,11 +174,13 @@ static void damon_reclaim_copy_quota_status(struct damos_quota *dst,
dst->charged_from = src->charged_from;
dst->charge_target_from = src->charge_target_from;
dst->charge_addr_from = src->charge_addr_from;
dst->esz_bp = src->esz_bp;
}
static int damon_reclaim_apply_parameters(void)
{
struct damos *scheme, *old_scheme;
struct damos_quota_goal *goal;
struct damos_filter *filter;
int err = 0;
@ -180,6 +197,17 @@ static int damon_reclaim_apply_parameters(void)
damon_reclaim_copy_quota_status(&scheme->quota,
&old_scheme->quota);
}
if (quota_autotune_feedback) {
goal = damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000);
if (!goal) {
damon_destroy_scheme(scheme);
return -ENOMEM;
}
goal->current_value = quota_autotune_feedback;
damos_add_quota_goal(&scheme->quota, goal);
}
if (skip_anon) {
filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true);
if (!filter) {