From nobody Sat Apr 4 00:12:46 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 770FF335555; Sun, 22 Mar 2026 15:57:38 +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=1774195058; cv=none; b=FeiI6N244swk1aIsmslRSFZatAjw8FKBZH35+tgjfvfp+0CT1Yv9AVm0teqPONvMZGC2kA3A/TWtES/r7FooaJWHx7e5fY6ezQ6AHCv1GoQmVMi8hc21H2ccH+8ZOwlzbK2uUj/176xeQ9jRILAF5+3Kilm4pF8XYebv5naB1VU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774195058; c=relaxed/simple; bh=4uaA+eem3fKB2uPWGLGeH18mf1wXB30aEUf0eMGJT00=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Pyi/qi6x6Kyjld2JGKWwicn5CXlgmHzzN5Xd0Ijxlm4GZHBNag0y7AN7dbMQ+fhpBr/t/Rw3h9+wx9QPXN4r1mNo5KayJk2jlhh53yoXKgIQB/0bACaoXx1NNSMzFmII7BdXe/ZOCZQVFAdL6DQRXcOD3aGad9QYdMw70nTEH18= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mcWBUA0v; 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="mcWBUA0v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45132C2BCB7; Sun, 22 Mar 2026 15:57:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774195058; bh=4uaA+eem3fKB2uPWGLGeH18mf1wXB30aEUf0eMGJT00=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mcWBUA0v1S+nQq/xWMdSkunC1QXnJA9K5/R6qIdXOda8x4pe3Qw65DmIG1X0zFdb8 ECow1YHbNKW6fBpHW0z2V26PgttJJ5a+ZJmp/H4V/V07WmvIiIUDw2h6RM5/o8XbBd 7VJy4tMFPEX/VVf3WiWYeUchdUHmSigjbglemysSLFuOETdvGejrow3zouTXLiiZi+ 9hFyFeIucYjVYph+ndoYqvE8mt74zqts4HKe/7Zk/dEltm/J2pvDEma0RMjMEzC5kz NuhQEBTjEkqqrLd9vyib2/WKQL7YljFbtmvzzg1fRwD06Bg9bfsq7wEGN8kDU5F28i Wn5luw/D2CKrQ== 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 v4 02/10] mm/damon/sysfs: add pause file under context dir Date: Sun, 22 Mar 2026 08:57:16 -0700 Message-ID: <20260322155728.81434-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260322155728.81434-1-sj@kernel.org> References: <20260322155728.81434-1-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" Add pause DAMON sysfs file under the context directory. It exposes the damon_ctx->pause API parameter to the users so that they can use the pause/resume feature. Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 6a44a2f3d8fc9..51893abd09472 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -866,6 +866,7 @@ struct damon_sysfs_context { struct damon_sysfs_attrs *attrs; struct damon_sysfs_targets *targets; struct damon_sysfs_schemes *schemes; + bool pause; }; =20 static struct damon_sysfs_context *damon_sysfs_context_alloc( @@ -878,6 +879,7 @@ static struct damon_sysfs_context *damon_sysfs_context_= alloc( context->kobj =3D (struct kobject){}; context->ops_id =3D ops_id; context->addr_unit =3D 1; + context->pause =3D false; return context; } =20 @@ -1053,6 +1055,30 @@ static ssize_t addr_unit_store(struct kobject *kobj, return count; } =20 +static ssize_t pause_show(struct kobject *kobj, struct kobj_attribute *att= r, + char *buf) +{ + struct damon_sysfs_context *context =3D container_of(kobj, + struct damon_sysfs_context, kobj); + + return sysfs_emit(buf, "%c\n", context->pause ? 'Y' : 'N'); +} + +static ssize_t pause_store(struct kobject *kobj, struct kobj_attribute *at= tr, + const char *buf, size_t count) +{ + struct damon_sysfs_context *context =3D container_of(kobj, + struct damon_sysfs_context, kobj); + bool pause; + int err =3D kstrtobool(buf, &pause); + + if (err) + return err; + context->pause =3D pause; + return count; +} + + static void damon_sysfs_context_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_context, kobj)); @@ -1067,10 +1093,14 @@ static struct kobj_attribute damon_sysfs_context_op= erations_attr =3D static struct kobj_attribute damon_sysfs_context_addr_unit_attr =3D __ATTR_RW_MODE(addr_unit, 0600); =20 +static struct kobj_attribute damon_sysfs_context_pause_attr =3D + __ATTR_RW_MODE(pause, 0600); + static struct attribute *damon_sysfs_context_attrs[] =3D { &damon_sysfs_context_avail_operations_attr.attr, &damon_sysfs_context_operations_attr.attr, &damon_sysfs_context_addr_unit_attr.attr, + &damon_sysfs_context_pause_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_context); @@ -1470,6 +1500,7 @@ static int damon_sysfs_apply_inputs(struct damon_ctx = *ctx, if (sys_ctx->ops_id =3D=3D DAMON_OPS_PADDR) ctx->min_region_sz =3D max( DAMON_MIN_REGION_SZ / sys_ctx->addr_unit, 1); + ctx->pause =3D sys_ctx->pause; err =3D damon_sysfs_set_attrs(ctx, sys_ctx->attrs); if (err) return err; --=20 2.47.3