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mm/damon/core: allow esz to be set to zero

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When the temporal quota goal tuner determines that the goal has been
achieved (score >= 10000), it sets esz_bp to zero so that the esz becomes
zero.  However, damos_set_effective_quota() clamps the esz to
min_region_sz when quota->ms is set.

This is a minor issue, the main problem is that it doesn't match the
description in the documentation, which state that if the goal has already
been [over-]achieved, the quota will be set to zero.

Fix this by set quota (esz) as minimum as possible.

Link: https://lore.kernel.org/20260908135413.97570-1-sj@kernel.org
Fixes: 8bbde987c2 ("mm/damon/core: disallow time-quota setting zero esz")
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Liew Rui Yan <aethernet65535@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SJ Park <sj@kernel.org>
Cc: <stable@vger.kernel.org> # v7.1.x
This commit is contained in:
Liew Rui Yan 2026-09-08 06:54:11 -07:00 committed by Andrew Morton
parent f166586f74
commit 90179da203
1 changed files with 3 additions and 2 deletions
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5
mm/damon/core.c
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@ -3091,6 +3091,7 @@ static void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)
struct damos_quota *quota = &s->quota;
unsigned long throughput;
unsigned long esz = ULONG_MAX;
unsigned long esz_time;
if (!quota->ms && list_empty(&quota->goals)) {
quota->esz = quota->sz;
@ -3111,8 +3112,8 @@ static void damos_set_effective_quota(struct damon_ctx *ctx, struct damos *s)
1000000, quota->total_charged_ns);
else
throughput = PAGE_SIZE * 1024;
esz = min(throughput * quota->ms, esz);
esz = max(ctx->min_region_sz, esz);
esz_time = max(throughput * quota->ms, ctx->min_region_sz);
esz = min(esz_time, esz);
}
if (quota->sz && quota->sz < esz)