From mboxrd@z Thu Jan 1 00:00:00 1970 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 097532BFC60 for ; Tue, 16 Dec 2025 18:58:20 +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=1765911500; cv=none; b=T/Da+AH6pS903Kf3O0NjPs8AhN38ByV1yuN5rMbwrj7O9z49whiKeUL6Vz6M3RgJ41ATfg8hBGiEjRC7rwLlO2V1XQ0EquiG+xureWNY1GofClvYT/DNKqi+InTIz7eCANNHlZA0hgy/vizWHmC0tzkTH3bM//Kv3DWb3NU5f+8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765911500; c=relaxed/simple; bh=epJ6oWLxx0/MVGiyVzgT6nSfkFR9L+lct4DoJTKaclY=; h=Date:To:From:Subject:Message-Id; b=XaI3A1Givqi9azTE6pOhh5gMoC57yPV3I/WcZlzrkhXsoeUr0hiBSHX4efWHMUHWqpZY1efqfffHKC0WI2hbzO4YIHSJuznQJ0LODuwqagYfXiRRxxFEO+vo28px27cDdR/bOt7h7aVqukKOSmpbNdj8O6+9jPQDD0wM07ukL7E= 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=l8+ra5iQ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="l8+ra5iQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFA41C4CEF1; Tue, 16 Dec 2025 18:58:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1765911499; bh=epJ6oWLxx0/MVGiyVzgT6nSfkFR9L+lct4DoJTKaclY=; h=Date:To:From:Subject:From; b=l8+ra5iQ6VfxRCWqNxRv/Xh3AZY8uiXtwhBojMoyBuRAxz/xauftweJkIJ5mtMzFt 5Q9ZQFThQQW7YMIG3NlPIEbfNvKQusHM0LM0/GqSk6+58SgcNQYixOK+Rs/6Olb7Wp 8HM6+ao5VtRi4x1yLBiVWCYSCaxvvNxHo/VrZl7s= Date: Tue, 16 Dec 2025 10:58:19 -0800 To: mm-commits@vger.kernel.org,vbabka@suse.cz,surenb@google.com,rppt@kernel.org,rostedt@goodmis.org,mhocko@suse.com,mhiramat@kernel.org,mathieu.desnoyers@efficios.com,lorenzo.stoakes@oracle.com,liam.howlett@oracle.com,corbet@lwn.net,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-damon-sysfs-schemes-implement-max_nr_snapshots-file.patch added to mm-new branch Message-Id: <20251216185819.CFA41C4CEF1@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/sysfs-schemes: implement max_nr_snapshots file has been added to the -mm mm-new branch. Its filename is mm-damon-sysfs-schemes-implement-max_nr_snapshots-file.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-schemes-implement-max_nr_snapshots-file.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 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: SeongJae Park Subject: mm/damon/sysfs-schemes: implement max_nr_snapshots file Date: Tue, 16 Dec 2025 00:01:21 -0800 Add a new DAMON sysfs file for setting and getting the newly introduced per-DAMON-snapshot level DAMOS deactivation control parameter, max_nr_snapshots. The file has a name same to the parameter and placed under the damos stat directory. Link: https://lkml.kernel.org/r/20251216080128.42991-9-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: "Masami Hiramatsu (Google)" Cc: Mathieu Desnoyers Cc: Michal Hocko Cc: Mike Rapoport Cc: Steven Rostedt Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/damon/sysfs-schemes.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) --- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-implement-max_nr_snapshots-file +++ a/mm/damon/sysfs-schemes.c @@ -205,6 +205,7 @@ struct damon_sysfs_stats { unsigned long sz_ops_filter_passed; unsigned long qt_exceeds; unsigned long nr_snapshots; + unsigned long max_nr_snapshots; }; static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) @@ -275,6 +276,28 @@ static ssize_t nr_snapshots_show(struct return sysfs_emit(buf, "%lu\n", stats->nr_snapshots); } +static ssize_t max_nr_snapshots_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_stats *stats = container_of(kobj, + struct damon_sysfs_stats, kobj); + + return sysfs_emit(buf, "%lu\n", stats->max_nr_snapshots); +} + +static ssize_t max_nr_snapshots_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_stats *stats = container_of(kobj, + struct damon_sysfs_stats, kobj); + unsigned long max_nr_snapshots, err = kstrtoul(buf, 0, &max_nr_snapshots); + + if (err) + return err; + stats->max_nr_snapshots = max_nr_snapshots; + return count; +} + static void damon_sysfs_stats_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); @@ -301,6 +324,9 @@ static struct kobj_attribute damon_sysfs static struct kobj_attribute damon_sysfs_stats_nr_snapshots_attr = __ATTR_RO_MODE(nr_snapshots, 0400); +static struct kobj_attribute damon_sysfs_stats_max_nr_snapshots_attr = + __ATTR_RW_MODE(max_nr_snapshots, 0600); + static struct attribute *damon_sysfs_stats_attrs[] = { &damon_sysfs_stats_nr_tried_attr.attr, &damon_sysfs_stats_sz_tried_attr.attr, @@ -309,6 +335,7 @@ static struct attribute *damon_sysfs_sta &damon_sysfs_stats_sz_ops_filter_passed_attr.attr, &damon_sysfs_stats_qt_exceeds_attr.attr, &damon_sysfs_stats_nr_snapshots_attr.attr, + &damon_sysfs_stats_max_nr_snapshots_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_stats); @@ -2730,6 +2757,7 @@ static struct damos *damon_sysfs_mk_sche damon_destroy_scheme(scheme); return NULL; } + scheme->max_nr_snapshots = sysfs_scheme->stats->max_nr_snapshots; return scheme; } _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-core-introduce-nr_snapshots-damos-stat.patch mm-damon-sysfs-schemes-introduce-nr_snapshots-damos-stat-file.patch docs-mm-damon-design-update-for-nr_snapshots-damos-stat.patch docs-admin-guide-mm-damon-usage-update-for-nr_snapshots-damos-stat.patch docs-abi-damon-update-for-nr_snapshots-damos-stat.patch mm-damon-update-damos-kerneldoc-for-stat-field.patch mm-damon-core-implement-max_nr_snapshots.patch mm-damon-sysfs-schemes-implement-max_nr_snapshots-file.patch docs-mm-damon-design-update-for-max_nr_snapshots.patch docs-admin-guide-mm-damon-usage-update-for-max_nr_snapshots.patch docs-abi-damon-update-for-max_nr_snapshots.patch mm-damon-core-add-trace-point-for-damos-stat-per-apply-interval.patch