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mm/damon/core: implement damon_probe_hits_wsum()

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When damon_probe->weight is set, the weighted sum of probe hits will be
useful.  It will be useful for not only the users but also DAMON internal
logics like regions merging.  Implement a function for calculating it.

Link: https://lore.kernel.org/20260710134651.18084-6-sj@kernel.org
Signed-off-by: SJ Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SJ Park
2026-07-10 06:46:34 -07:00
committed by Andrew Morton
parent d235513a7c
commit cfe9e8c738
2 changed files with 26 additions and 0 deletions
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2
include/linux/damon.h
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@@ -1012,6 +1012,8 @@ 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);
unsigned int damon_probe_hits_wsum(struct damon_region *r, bool last,
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);

24
mm/damon/core.c
View File

@@ -393,6 +393,30 @@ static bool damon_is_last_region(struct damon_region *r,
return list_is_last(&r->list, &t->regions_list);
}
/**
* damon_probe_hits_wsum() - Returns probe hits weighted sum of a region.
* @r: region to get the weighted sum of.
* @last: if the request is for last-window aggregated probe hits.
* @ctx: context of &r.
*
* Return: the weighted sum of probe hits of the region.
*/
unsigned int damon_probe_hits_wsum(struct damon_region *r, bool last,
struct damon_ctx *ctx)
{
struct damon_probe *probe;
unsigned int sum = 0;
int i = 0;
damon_for_each_probe(probe, ctx) {
if (last)
sum += r->last_probe_hits[i++] * probe->weight;
else
sum += r->probe_hits[i++] * probe->weight;
}
return sum;
}
/*
* Check whether a region is intersecting an address range
*