From nobody Tue Dec 2 01:26:25 2025 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 D900E2D7804; Sun, 23 Nov 2025 18:43:44 +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=1763923424; cv=none; b=ShxeTs1AAD1T751GFpvMtajAUnRXkYWe72ClRlq2Gfzng9MrbjOOA1zVn3acU4VwDQsd5AAZ8fgpWmCm5o6NjPyZ26jEy8p/XXV7jBDRr2VJ18SUqG9A6a73gUr8H4FuGzhJ0cGzD3zEQ9g+e/8LeKwlvMru7Ag0l+d7QLILOuk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763923424; c=relaxed/simple; bh=flHCn1jzwJYbHp6Nyj2GAUs2tIfp0Jhpc5MXnsDhPc8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fHR2aGJVknlfyZlZtbQaDM7918meyEtItecg2h2wS1cTWNOACK1MI450Msk1DmPHEvWv/29kZes94/xV7i3xBG0qhxpRP+IfZNAom9YB7nGV4RijKlBZcAE2SY1pS/SqqZa8gTGeVd/xUwtHvpIe7iB7lCDmFjXgZ70REPgkGmI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EWcxawcm; 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="EWcxawcm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98571C19422; Sun, 23 Nov 2025 18:43:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763923424; bh=flHCn1jzwJYbHp6Nyj2GAUs2tIfp0Jhpc5MXnsDhPc8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EWcxawcm3Wldt4q2Fk+N/iVtuR2wUJd4gie6Gwzx0wakwV72c2gYTNBoOY9FUhvXQ 8Mu3ZswD/pPPtgFMiCsEH9649+sKKLO7GguUAVZVLV8828LgjhI91u5ySL9IgQyySv llMTWbih/na/Q/hlRpkYmE+dDbe4GVxyb+XSuqEcLWadebqsTtsheGIYeCGoeDXUrD 5hOpw9cBW7yESLVi2uxKTcCrE6zcpSYNDxkAsAU1JEvZyR1jVhy2NNLJd6dsD0Mqwt dTEzcxzfhflNWP0FX1+XDXN6OW86t9yIVdoO6naM+m5ZzIQOImWSxpVKopwt/ifhv9 fPynkYljdoN3g== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 02/12] mm/damon/sysfs-schemes: introduce nr_snapshots damos stat file Date: Sun, 23 Nov 2025 10:43:16 -0800 Message-ID: <20251123184329.85287-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251123184329.85287-1-sj@kernel.org> References: <20251123184329.85287-1-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 30d20f5b3192..4d25469f957f 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); @@ -2761,6 +2775,7 @@ 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