From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A26CD4848A5; Tue, 13 Oct 2026 04:34:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791866047; cv=none; b=mhuoIQXIQOWEFXz2p1YQwLEY3ZB2XzsxX0Bj/R6q/5JOBJ+oSb67wfOjmJS/G1w8Y9hktTutOeCkxfIBh5FS3NNoMk7LAUJPPgQ4j7+Pt4T6WgzSj1cqOuzyAsMPhgM6iEJNsSp/PjYSbtSCwAR5Ze8Bt/x8mvxBbmdBxooR4jU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791866047; c=relaxed/simple; bh=beg+Q7REVhP42iavj2C5HouSLDfPxa9rSXe969Zew1Y=; h=Date:To:From:Subject:Message-Id; b=EZPNkCLh4Aavugbtnauk/Obsvwkp0SM9O5kyoefNXCxPUTEKSTXm9wqeIDLtGXufJ3v714W1n3Iw94X2VqNQmZJnsl/3RpYcrkwByRY6BnHZxK2wtfSs+CaIlJWkd3QJ+9bYNoO3EQuYONX6i8qqd8dIzw9Zvzds+m6QQ2N6fHc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=Gzw5uk4h; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="Gzw5uk4h" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 794B31F00893; Tue, 13 Oct 2026 04:34:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791866044; bh=CBvpEWbS4C2LqxsYy/6x1X3sgYiJ/vNd2eL+iwFxRvU=; h=Date:To:From:Subject; b=Gzw5uk4hCyWkMrlq2kduirPHKbzGJQjWCLgJTHvXGjy5BsLNVQb6rDKjduOQM9Cmj glr+BYjBxHdnx1cLpHj6ivIGBmMtkX49YbDMdpsJn5PzG3avmxJz+0d+J1VkmdcOpy bHAs2sFcgiGteeNnv8MtOuewmDFIGDCkhNNbjJZE= Date: Mon, 12 Oct 2026 21:34:04 -0700 To: mm-commits@vger.kernel.org,stable@vger.kernel.org,sj@kernel.org,david@davidgow.net,brendan.higgins@linux.dev,donggeunyoo.kernel@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-damon-core-charge-only-the-part-of-a-region-the-filter-left.patch removed from -mm tree Message-Id: <20261013043404.794B31F00893@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/damon/core: charge only the part of a region the filter left has been removed from the -mm tree. Its filename was mm-damon-core-charge-only-the-part-of-a-region-the-filter-left.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Donggeun Yoo Subject: mm/damon/core: charge only the part of a region the filter left Date: Mon, 21 Sep 2026 08:24:41 -0700 Patch series "mm/damon/core: fix the size charged for a filter-trimmed region", v2. An address range DAMOS filter that partially overlaps a monitoring region splits it, so the scheme action reaches only one side of the boundary. damos_apply_scheme() reads the region size before that split and never re-reads it, so the quota charge and schemes//stats/sz_tried account for the whole original region. Patch 1 re-reads the size after the core filters have run. Patch 2 adds KUnit coverage for what the function charges and reports, for the trimmed cases and for the cases that must not change. This patch (of 2): An address range DAMOS filter that partially overlaps a monitoring region splits the region at the filter boundary, so the scheme action is applied to only one side of it. damos_apply_scheme() reads the region size once on entry, before damos_core_filter_out() performs that split. The quota charge and the statistics update therefore account for the region as it was before the trim. schemes//stats/sz_tried counts memory the filter excluded, which Documentation/mm/damon/design.rst says is not counted as tried, and with quotas/bytes set the excluded part is charged against the budget, throttling the scheme to a fraction of what was configured. User impact is that DAMOS could unexpectedly slowly run, due to over-charged quota. DAMOS stat could also be confusing. No critical events such as crashes or leask happen. Re-read the region size after the core filters have run. Link: https://lore.kernel.org/20260921152443.80132-1-sj@kernel.org Link: https://lore.kernel.org/20260921152443.80132-2-sj@kernel.org Fixes: ab9bda001b68 ("mm/damon/core: introduce address range type damos filter") Signed-off-by: Donggeun Yoo Signed-off-by: SJ Park Signed-off-by: Andrew Morton Reviewed-by: SJ Park Cc: Brendan Higgins Cc: David Gow Cc: --- mm/damon/core.c | 1 + 1 file changed, 1 insertion(+) --- a/mm/damon/core.c~mm-damon-core-charge-only-the-part-of-a-region-the-filter-left +++ a/mm/damon/core.c @@ -2784,6 +2784,7 @@ static void damos_apply_scheme(struct da } if (damos_core_filter_out(c, t, r, s)) return; + sz = damon_sz_region(r); ktime_get_coarse_ts64(&begin); trace_damos_before_apply(cidx, sidx, tidx, r, nr_accesses, damon_nr_regions(t), do_trace); _ Patches currently in -mm which might be from donggeunyoo.kernel@gmail.com are userfaultfd-clear-the-inherited-uffd-bit-in-move_swap_pte.patch mm-damon-core-prevent-size-quota-overflow-in-the-temporal-goal-tuner.patch mm-damon-tests-core-kunit-test-the-temporal-tuners-size-quota-conversion.patch