DAMON_STAT calculates the idle time for a region as the region's age multiplied by the aggregation interval. That is, the aggregation interval is the granularity of the idle time. Since the aggregation interval is auto-tuned and not exposed to users, however, users cannot easily know in what granularity the stat is made. Expose the tuned aggregation interval in microseconds via a new parameter, aggr_interval_us. Signed-off-by: SeongJae Park --- mm/damon/stat.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/damon/stat.c b/mm/damon/stat.c index 87bcd8866d4b..ff1c076185e6 100644 --- a/mm/damon/stat.c +++ b/mm/damon/stat.c @@ -39,6 +39,11 @@ module_param_array(memory_idle_ms_percentiles, ulong, NULL, 0400); MODULE_PARM_DESC(memory_idle_ms_percentiles, "Memory idle time percentiles in milliseconds"); +static unsigned long aggr_interval_us; +module_param(aggr_interval_us, ulong, 0400); +MODULE_PARM_DESC(aggr_interval_us, + "Current tuned aggregation interval in microseconds"); + static struct damon_ctx *damon_stat_context; static void damon_stat_set_estimated_memory_bandwidth(struct damon_ctx *c) @@ -133,6 +138,7 @@ static int damon_stat_damon_call_fn(void *data) return 0; last_refresh_jiffies = jiffies; + aggr_interval_us = c->attrs.aggr_interval; damon_stat_set_estimated_memory_bandwidth(c); damon_stat_set_idletime_percentiles(c); return 0; -- 2.39.5