From nobody Sat Feb 7 20:58:11 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 01E64342CB8; Tue, 16 Dec 2025 08:01:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765872106; cv=none; b=VS5NoCp9exMnCijR8kxLz5gbbBSArpNQxH9QOxBHAewVzVQBKaMeU74nZfaPa9qGHr52Jt8MRZOAfSx4OI5I3ZXcdm4NaLyd10QBhFbi0uTJHkCwfIfv1M5ojKPvNvGMgjyg/rutCDTOJ6VVK/3Wv3ndfjKfjqyTHrJdxuNllnU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765872106; c=relaxed/simple; bh=EheTKTWNwlESlsGw3Z3YuTZbvfPyPa97pgV7/l/okj8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WmA6kYuYTHfrQnAO74tdsbOthSFxuhBqnOnR+/7YtfSVG6OqQr5u82vUc0Cc8b3E5+qEEY2ck/RmB2itIH1rzM8/YxwUa7yOR/ucxgBzvBfoUmrApP6jR9P2swz/3ALyg9r9pz3JmYHUMsp2u4ylKg6KmY6HlhhQNRNvTPPx9Cc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PtTftagF; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PtTftagF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 93556C4CEF1; Tue, 16 Dec 2025 08:01:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765872105; bh=EheTKTWNwlESlsGw3Z3YuTZbvfPyPa97pgV7/l/okj8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PtTftagFA6aDpibycmhBVk+mdFNBF0N5kixw4SIegT3Uk5eNoeKz8vtoXLTeZ+k5Y klim1SnBtXXcyu0Twva67/CC+W9QK62Wgr4GNAzIdXXYEyMs/PZJfgy8IWrQZFAJ46 0eMnkH/nNRMGP9ES+CbFoWPT3emcFnpQbYxhrAv2ZtJQEV94SoLrON3OZvBbfx0aW9 3RUrK3v3UmPVb2/CBmWsjbb0QCE5MMaSES9M1SuUYJ9j0iBTkgKewWprEEYRdZun69 jdDoAIXYASZoWgGp7N90a0A6Jzq4sC2NNV5Amy2gF4jCEA/o2ewXfbWob1ebCJczjM svBhe6cSBUouA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 02/12] mm/damon/sysfs-schemes: introduce nr_snapshots damos stat file Date: Tue, 16 Dec 2025 00:01:15 -0800 Message-ID: <20251216080128.42991-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251216080128.42991-1-sj@kernel.org> References: <20251216080128.42991-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce a new DAMON sysfs interface file for exposing the newly added DAMOS stat, nr_snapshots. The file has the name same to the stat name (nr_snapshots) and placed under the damos stat sysfs directory. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index a71059e65d34..a1f555e1125a 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -204,6 +204,7 @@ struct damon_sysfs_stats { unsigned long sz_applied; unsigned long sz_ops_filter_passed; unsigned long qt_exceeds; + unsigned long nr_snapshots; }; =20 static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) @@ -265,6 +266,15 @@ static ssize_t qt_exceeds_show(struct kobject *kobj, return sysfs_emit(buf, "%lu\n", stats->qt_exceeds); } =20 +static ssize_t nr_snapshots_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_stats *stats =3D container_of(kobj, + struct damon_sysfs_stats, kobj); + + return sysfs_emit(buf, "%lu\n", stats->nr_snapshots); +} + static void damon_sysfs_stats_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); @@ -288,6 +298,9 @@ static struct kobj_attribute damon_sysfs_stats_sz_ops_f= ilter_passed_attr =3D static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr =3D __ATTR_RO_MODE(qt_exceeds, 0400); =20 +static struct kobj_attribute damon_sysfs_stats_nr_snapshots_attr =3D + __ATTR_RO_MODE(nr_snapshots, 0400); + static struct attribute *damon_sysfs_stats_attrs[] =3D { &damon_sysfs_stats_nr_tried_attr.attr, &damon_sysfs_stats_sz_tried_attr.attr, @@ -295,6 +308,7 @@ static struct attribute *damon_sysfs_stats_attrs[] =3D { &damon_sysfs_stats_sz_applied_attr.attr, &damon_sysfs_stats_sz_ops_filter_passed_attr.attr, &damon_sysfs_stats_qt_exceeds_attr.attr, + &damon_sysfs_stats_nr_snapshots_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_stats); @@ -2760,6 +2774,7 @@ void damon_sysfs_schemes_update_stats( sysfs_stats->sz_ops_filter_passed =3D scheme->stat.sz_ops_filter_passed; sysfs_stats->qt_exceeds =3D scheme->stat.qt_exceeds; + sysfs_stats->nr_snapshots =3D scheme->stat.nr_snapshots; } } =20 --=20 2.47.3