From 2dbb60f789cbb5c0000a4664f40f9358b3a62ba2 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Mon, 19 Feb 2024 11:44:24 -0800 Subject: mm/damon/core: implement PSI metric DAMOS quota goal Extend DAMOS quota goal metric with system wide memory pressure stall time. Specifically, the system level 'some' PSI for memory is used. The target value can be set in microseconds. DAMOS measures the increased amount of the PSI metric in last quota_reset_interval and use the ratio of it versus the user-specified target PSI value as the score for the auto-tuning feedback loop. Link: https://lkml.kernel.org/r/20240219194431.159606-14-sj@kernel.org Signed-off-by: SeongJae Park Signed-off-by: Andrew Morton --- mm/damon/core.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'mm') diff --git a/mm/damon/core.c b/mm/damon/core.c index 973423166ee28..6d503c1c125ef 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -1125,6 +1126,25 @@ static unsigned long damon_feed_loop_next_input(unsigned long last_input, return min_input; } +#ifdef CONFIG_PSI + +static u64 damos_get_some_mem_psi_total(void) +{ + if (static_branch_likely(&psi_disabled)) + return 0; + return div_u64(psi_system.total[PSI_AVGS][PSI_MEM * 2], + NSEC_PER_USEC); +} + +#else /* CONFIG_PSI */ + +static inline u64 damos_get_some_mem_psi_total(void) +{ + return 0; +}; + +#endif /* CONFIG_PSI */ + static void damos_set_quota_goal_current_value(struct damos_quota_goal *goal) { u64 now_psi_total; @@ -1133,6 +1153,11 @@ static void damos_set_quota_goal_current_value(struct damos_quota_goal *goal) case DAMOS_QUOTA_USER_INPUT: /* User should already set goal->current_value */ break; + case DAMOS_QUOTA_SOME_MEM_PSI_US: + now_psi_total = damos_get_some_mem_psi_total(); + goal->current_value = now_psi_total - goal->last_psi_total; + goal->last_psi_total = now_psi_total; + break; default: break; } -- cgit 1.2.3-korg