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 BA4F639B94A; Mon, 21 Sep 2026 19:29:02 +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=1790018944; cv=none; b=q/Ubf9uRY2HKk50CxibvOZLMVAJjx4yYbODP1uIks/OFDxa4L/NT8Tiiv4VYGAFDj74pO8GmhXPDWUCIaYojbb59bJ5V2pCBncNCN02weu/88GMMn52t5+fxhReeSvx6JmqUT2pFn3m7zdwtYS1ib8MejKY2cLnPYJpPkjKIL4A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790018944; c=relaxed/simple; bh=/zqAhZ6ZmATbRjUgB3nSfL79dTJ2lIPaH9WDZwj7u4k=; h=Date:To:From:Subject:Message-Id; b=QcztXsp4zCH+NYPjlsef2hAYCkGOyadr9f/IhZvfnyGycSoxFqgsU7vH0wm1RZ5SSf281Vt6M75aiRGWoai0A0MXOi+VoEh+foyo7sHwWFPUox/JEIzTCCA5WOeBjahDuAtOFkp/vMcYuOy2Z39RLEadTLpNbM2wdQQOkqeURg4= 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=zIXSaqw+; 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="zIXSaqw+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72C611F00898; Mon, 21 Sep 2026 19:29:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1790018942; bh=2yQSBB9+QfEe/7UUwe9jeZMdSJEApqsxiD8a6QZJ57E=; h=Date:To:From:Subject; b=zIXSaqw+6yEVpXrlGUtyNvXXA4ZQfYj7shgJzEZsALus2OKP3HNNXBogSsddi5ZRq GzJUQWlKrNN8of7O+wdiNpo1EEGQkzbsiHVKXU4OLz7wH3Boypx6gJG6hB7wEmKVUh BcbpCXMqr/PNut9XSbxygiJJB8CWBohpFb9+chRY= Date: Mon, 21 Sep 2026 12:29:01 -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: + mm-damon-core-charge-only-the-part-of-a-region-the-filter-left.patch added to mm-new branch Message-Id: <20260921192902.72C611F00898@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/damon/core: charge only the part of a region the filter left has been added to the -mm mm-new branch. Its filename is mm-damon-core-charge-only-the-part-of-a-region-the-filter-left.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-charge-only-the-part-of-a-region-the-filter-left.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ 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 mm-damon-core-charge-only-the-part-of-a-region-the-filter-left.patch mm-damon-tests-core-kunit-test-the-size-charged-for-a-filter-trimmed-region.patch