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mm/damon/core: make charge_addr_from aware of end-address exclusivity

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DAMON region end address is exclusive one, but charge_addr_from is
assigned assuming the end address is inclusive.  As a result, DAMOS action
to next up to min_region_sz memory can be skipped.  This is quite
negligible user impact.  But, the bug is a bug that can be very simply
fixed.  Fix the wrong assignment to respect the exclusiveness of the
address.

The issue was discovered [1] by Sashiko.

Link: https://lore.kernel.org/20260428042942.118230-1-sj@kernel.org
Link: https://lore.kernel.org/20260428032324.115663-1-sj@kernel.org [1]
Fixes: 50585192bc ("mm/damon/schemes: skip already charged targets and regions")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> # 5.16.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-04-27 21:29:40 -07:00 committed by Andrew Morton
parent 214f9ab72c
commit 5a2d162e22
1 changed files with 1 additions and 1 deletions
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2
mm/damon/core.c
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@ -2106,7 +2106,7 @@ static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t,
if (damos_quota_is_set(quota) &&
quota->charged_sz >= quota->esz) {
quota->charge_target_from = t;
quota->charge_addr_from = r->ar.end + 1;
quota->charge_addr_from = r->ar.end;
}
}
if (s->action != DAMOS_STAT)