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 --- include/linux/damon.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/linux/damon.h') diff --git a/include/linux/damon.h b/include/linux/damon.h index 5a06993d8479..886d07294f4e 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -130,12 +130,14 @@ enum damos_action { * enum damos_quota_goal_metric - Represents the metric to be used as the goal * * @DAMOS_QUOTA_USER_INPUT: User-input value. + * @DAMOS_QUOTA_SOME_MEM_PSI_US: System level some memory PSI in us. * @NR_DAMOS_QUOTA_GOAL_METRICS: Number of DAMOS quota goal metrics. * * Metrics equal to larger than @NR_DAMOS_QUOTA_GOAL_METRICS are unsupported. */ enum damos_quota_goal_metric { DAMOS_QUOTA_USER_INPUT, + DAMOS_QUOTA_SOME_MEM_PSI_US, NR_DAMOS_QUOTA_GOAL_METRICS, }; @@ -144,6 +146,7 @@ enum damos_quota_goal_metric { * @metric: Metric to be used for representing the goal. * @target_value: Target value of @metric to achieve with the tuning. * @current_value: Current value of @metric. + * @last_psi_total: Last measured total PSI * @list: List head for siblings. * * Data structure for getting the current score of the quota tuning goal. The @@ -159,6 +162,10 @@ struct damos_quota_goal { enum damos_quota_goal_metric metric; unsigned long target_value; unsigned long current_value; + /* metric-dependent fields */ + union { + u64 last_psi_total; + }; struct list_head list; }; -- cgit v1.2.3-73-gaa49b