diff options
| author | SJ Park <sj@kernel.org> | 2026-07-03 10:06:02 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-07-30 19:40:39 -0700 |
| commit | 2ec26dd341d123be8a5577207f25dbecf164e220 (patch) | |
| tree | 791ab3552658c1005cd3677727f5034fd81e7e94 | |
| parent | aa497a270f68bec8fa0d83b70608cddb0c7275ff (diff) | |
mm/damon/core: introduce damon_probe_hits_mvsum()
Implement a function for getting a reasonable best effort quality pseudo
moving sums of probe_hits on demands. It reuses the internal function for
the pseudo moving sum for data access frequency (nr_accesses).
Link: https://lore.kernel.org/20260703170605.94472-3-sj@kernel.org
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/damon.h | 2 | ||||
| -rw-r--r-- | mm/damon/core.c | 21 |
2 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/damon.h b/include/linux/damon.h index 4f7e305b261c..616bdf0954b5 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -1003,6 +1003,8 @@ void damon_add_probe(struct damon_ctx *ctx, struct damon_probe *probe); struct damon_region *damon_new_region(unsigned long start, unsigned long end); unsigned int damon_nr_accesses_mvsum(struct damon_region *r, struct damon_ctx *ctx); +unsigned char damon_probe_hits_mvsum(int probe_idx, struct damon_region *r, + struct damon_ctx *ctx); int damon_set_regions(struct damon_target *t, struct damon_addr_range *ranges, unsigned int nr_ranges, unsigned long min_region_sz); diff --git a/mm/damon/core.c b/mm/damon/core.c index d45dc87fbbd9..871c6f5257c9 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -273,6 +273,27 @@ unsigned int damon_nr_accesses_mvsum(struct damon_region *r, left_window_bp); } +unsigned char damon_probe_hits_mvsum(int probe_idx, struct damon_region *r, + struct damon_ctx *ctx) +{ + unsigned long sample_interval, aggr_interval; + unsigned long window_len, left_window, left_window_bp; + + sample_interval = ctx->attrs.sample_interval ? : 1; + aggr_interval = ctx->attrs.aggr_interval ? : 1; + window_len = aggr_interval / sample_interval; + if (time_after_eq(ctx->passed_sample_intervals, + ctx->next_aggregation_sis)) + left_window = 0; + else + left_window = ctx->next_aggregation_sis - + ctx->passed_sample_intervals; + left_window_bp = mult_frac(left_window, 10000, window_len); + + return damon_mvsum(r->probe_hits[probe_idx], + r->last_probe_hits[probe_idx], left_window_bp); +} + #ifdef CONFIG_DAMON_DEBUG_SANITY static void damon_verify_new_region(unsigned long start, unsigned long end) { |