From nobody Mon Oct 6 22:46:33 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 1FE231F8AC5; Thu, 17 Jul 2025 05:54:55 +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=1752731697; cv=none; b=P1H6AySCUAKz8Yi2p1BzEah1VY0M83sZkJVWfWTfhhvi4lLdXZdLgzT209A04cnEP+fhr+c02m9ml/BCUYRwfNl2UsviaRelinregnZTZ5fYqsdgeUIvZ+yk/mQ0ZS7UoRVkJlXF45mzZkXKc1sULgSX1erY9nTinOL9Oriht9Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752731697; c=relaxed/simple; bh=UtykI35djlz4/u32hylRxjPmwdljWWbpzC+3yqmXBmg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Tv6ZcGhK9xdv8DJkRtQv/cxb4daYSQ5oD33rSgKfgl2t00yBQiox8+s0VkHImXNKNF8KC0QB4M519WkpegP4ncN/AAXseaAi3CZ8Fmk2KG5tFFu+H4eD007uCmUVp0FigTd4ysz7KOPKkscay+77AZsKTiE1CuGfk843fHenwkU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=No+y/kRh; 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="No+y/kRh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77003C4CEED; Thu, 17 Jul 2025 05:54:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752731695; bh=UtykI35djlz4/u32hylRxjPmwdljWWbpzC+3yqmXBmg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=No+y/kRh+ouxJUHLNZzi6B/wN5RKDkCa/e8cn6fr6+kyErKqAJ8wQbJm9E4bRTJOD 5FD6eBqE+UviTyLGBHE8jOJLpB+hOcuUzYycysRtn8WnQSZVGt211OuoNFW+Z68iS3 An1o+1t/XknkKZyFm6hZVoRVAKkXSFHSlERA00prjZxE5/Mva4OQz2UkQVeOdtomu6 EIgiHO3BaZZvANKWr2PmE+sI9AQyYh3vRfAwV08yWem0VkblYUIKrjJ30VHuM6cEom GZSjUUdAZ1LO4K5CajFQWHjxsfNVBw4MQ+w/Jp709ga2ZufpIdS3hgVweIMLaIJMN0 Zp5aemLP2eyrA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/4] mm/damon/sysfs: implement refresh_ms file under kdamond directory Date: Wed, 16 Jul 2025 22:54:45 -0700 Message-Id: <20250717055448.56976-2-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250717055448.56976-1-sj@kernel.org> References: <20250717055448.56976-1-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" Implement a new DAMON sysfs file named 'refresh_ms' under each kdamond directory. The file will be used as a control knob of automatic refresh of a few DAMON internal status files. This commit implements only minimum file operations, though. The automatic refresh feature will be implemented by the following commit. Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index cce2c8a296e2..4296dc201f4d 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -1155,6 +1155,7 @@ struct damon_sysfs_kdamond { struct kobject kobj; struct damon_sysfs_contexts *contexts; struct damon_ctx *damon_ctx; + unsigned int refresh_ms; }; =20 static struct damon_sysfs_kdamond *damon_sysfs_kdamond_alloc(void) @@ -1690,6 +1691,30 @@ static ssize_t pid_show(struct kobject *kobj, return sysfs_emit(buf, "%d\n", pid); } =20 +static ssize_t refresh_ms_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_kdamond *kdamond =3D container_of(kobj, + struct damon_sysfs_kdamond, kobj); + + return sysfs_emit(buf, "%u\n", kdamond->refresh_ms); +} + +static ssize_t refresh_ms_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_kdamond *kdamond =3D container_of(kobj, + struct damon_sysfs_kdamond, kobj); + unsigned int nr; + int err =3D kstrtouint(buf, 0, &nr); + + if (err) + return err; + + kdamond->refresh_ms =3D nr; + return count; +} + static void damon_sysfs_kdamond_release(struct kobject *kobj) { struct damon_sysfs_kdamond *kdamond =3D container_of(kobj, @@ -1706,9 +1731,13 @@ static struct kobj_attribute damon_sysfs_kdamond_sta= te_attr =3D static struct kobj_attribute damon_sysfs_kdamond_pid_attr =3D __ATTR_RO_MODE(pid, 0400); =20 +static struct kobj_attribute damon_sysfs_kdamond_refresh_ms_attr =3D + __ATTR_RW_MODE(refresh_ms, 0600); + static struct attribute *damon_sysfs_kdamond_attrs[] =3D { &damon_sysfs_kdamond_state_attr.attr, &damon_sysfs_kdamond_pid_attr.attr, + &damon_sysfs_kdamond_refresh_ms_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_kdamond); --=20 2.39.5