diff options
| author | SeongJae Park <sj@kernel.org> | 2024-02-19 11:44:30 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-23 17:48:30 -0800 |
| commit | 7ce55f8ffdedc0e59d53f7003b7bd912b19918a7 (patch) | |
| tree | ec44d4c16b30a9cc30057e985bfb2e4237eaa322 /mm/damon | |
| parent | 58dea17d7a0f8e5dfd36d4ae26e85a26e866b0d4 (diff) | |
| download | lwn-7ce55f8ffdedc0e59d53f7003b7bd912b19918a7.tar.gz lwn-7ce55f8ffdedc0e59d53f7003b7bd912b19918a7.zip | |
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>
Diffstat (limited to 'mm/damon')
| -rw-r--r-- | mm/damon/reclaim.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 9df6b8819998..9bd341d62b4c 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -63,6 +63,21 @@ 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. * * While keeping the caps that set by other quotas, DAMON_RECLAIM automatically @@ -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) { |