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mm/damon/reclaim: implement memory PSI-driven quota self-tuning 

Support the PSI-driven quota self-tuning from DAMON_RECLAIM by introducing
yet another parameter, 'quota_mem_pressure_us'.  Users can set the desired
amount of memory pressure stall time per each quota reset interval using
the parameter.  Then DAMON_RECLAIM monitor the memory pressure stall time,
specifically system-wide memory 'some' PSI value that increased during the
given time interval, and self-tune the quota using the DAMOS core logic.

Link: https://lkml.kernel.org/r/20240219194431.159606-20-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 11:44:30 -08:00 committed by Andrew Morton
parent 58dea17d7a
commit 7ce55f8ffd
1 changed files with 25 additions and 0 deletions
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25
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);
/*
* Desired level of memory pressure-stall time in microseconds.
*
* While keeping the caps that set by other quotas, DAMON_RECLAIM automatically
* increases and decreases the effective level of the quota aiming this level of
* memory pressure is incurred. System-wide ``some`` memory PSI in microseconds
* per quota reset interval (``quota_reset_interval_ms``) is collected and
* compared to this value to see if the aim is satisfied. Value zero means
* disabling this auto-tuning feature.
*
* Disabled by default.
*/
static unsigned long quota_mem_pressure_us __read_mostly;
module_param(quota_mem_pressure_us, ulong, 0600);
/*
* User-specifiable feedback for auto-tuning of the effective quota.
*
@ -198,6 +213,16 @@ static int damon_reclaim_apply_parameters(void)
&old_scheme->quota);
}
if (quota_mem_pressure_us) {
goal = damos_new_quota_goal(DAMOS_QUOTA_SOME_MEM_PSI_US,
quota_mem_pressure_us);
if (!goal) {
damon_destroy_scheme(scheme);
return -ENOMEM;
}
damos_add_quota_goal(&scheme->quota, goal);
}
if (quota_autotune_feedback) {
goal = damos_new_quota_goal(DAMOS_QUOTA_USER_INPUT, 10000);
if (!goal) {