FAILED: patch "[PATCH] mm/damon/core: allow esz to be set to zero" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 90179da203ba8b708c84a12a07cd44be0f346334
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026092900-finalize-hungry-54dc@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 90179da203ba8b708c84a12a07cd44be0f346334 Mon Sep 17 00:00:00 2001
From: Liew Rui Yan <[email protected]>
Date: Tue, 8 Sep 2026 06:54:11 -0700
Subject: [PATCH] mm/damon/core: allow esz to be set to zero

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.

index 644daf5a1656..2b294fb46648 100644
@@ -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)

This patch also depends on temporal tuner feature. It is introduced in 7.1. Because it is a feature, <7.1 stable kernels don't have the features. So this patch shouldn't be applied on 6.6.y. Please don't port it on 6.6.y.

Thanks,
SJ

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