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mm/damon/core: introduce damon_probe_hits_mvsum()

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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>
This commit is contained in:
SJ Park
2026-07-03 10:06:02 -07:00
committed by Andrew Morton
parent aa497a270f
commit 2ec26dd341
2 changed files with 23 additions and 0 deletions
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2
include/linux/damon.h
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@@ -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);

21
mm/damon/core.c
View File

@@ -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)
{