From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B783348167D for ; Tue, 1 Sep 2026 17:17:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788283077; cv=none; b=Pig0hFbtxLlRVQlXZOwmHaFCskknkaDLVJkqH2Cg5wdmmPwGOXk44jtJBvzaBaKMXO6PYIvk3cir1juafQrwYkQLePYT67yQ2OsIetc1jHnEqZXroMlsVSSIYap2JDybjdt4n1UpJXAM0E09XrkLL0s1XqXEH6HTbxe2p9vu59w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788283077; c=relaxed/simple; bh=f3CpKuE9udzSlGXND85r4G2JGic+iQycH0RETbqHG9M=; h=Date:To:From:Subject:Message-Id; b=G4KYSUS4qwluErCd2G7UMycyqtX4o9AvX5FQqdzBspv3d9gqk/z0US0GZkodIGjzZ73UOT+oGiU/OeZg695JUxgh2oWlxxaOCWvOosa/ITXOzElHozK/aqXpwg7mwLKu8Nvy0f+ttgtobGeVyfT1OgEX+4nZo8DsoPRIGyZbMQU= 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=c6pggxPz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="c6pggxPz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C49E1F000E9; Tue, 1 Sep 2026 17:17:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1788283075; bh=AGkT0mN+ilsTT04pOXXLq7EOv7hG2KZ5n7iOfTdWsOg=; h=Date:To:From:Subject; b=c6pggxPzVr2mubBHjwgt3WDtSAmhxlU1tH2LoRMKfcxfCWvmnJeHUYfjpdPbQVjW7 cNTQuLiktYJ4NJuYqwx5AQWa2YOl5Ts8GVsnvsOeSpcfF8MPcUEmoXPqhhq20GRbnP bRB4MfUM6S2es/px6vm29ihnRJO5hqEqz0pX+Ix8= Date: Tue, 01 Sep 2026 10:17:55 -0700 To: mm-commits@vger.kernel.org,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-damon-sysfs-implement-preps-nr_preps-file.patch added to mm-new branch Message-Id: <20260901171755.8C49E1F000E9@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: implement preps/nr_preps file has been added to the -mm mm-new branch. Its filename is mm-damon-sysfs-implement-preps-nr_preps-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-implement-preps-nr_preps-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 If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is 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: SJ Park Subject: mm/damon/sysfs: implement preps/nr_preps file Date: Tue, 1 Sep 2026 06:24:57 -0700 Implement nr_preps file under the preps directory. It will be evolved to be used for generating sub directories that will represent each probe preparation action. Link: https://lore.kernel.org/20260901132506.99243-11-sj@kernel.org Signed-off-by: SJ Park Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Randy Dunlap Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/damon/sysfs.c | 53 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-) --- a/mm/damon/sysfs.c~mm-damon-sysfs-implement-preps-nr_preps-file +++ a/mm/damon/sysfs.c @@ -755,6 +755,7 @@ static const struct kobj_type damon_sysf struct damon_sysfs_preps { struct kobject kobj; + int nr; }; static struct damon_sysfs_preps *damon_sysfs_preps_alloc(void) @@ -762,12 +763,60 @@ static struct damon_sysfs_preps *damon_s return kzalloc_obj(struct damon_sysfs_preps); } +static void damon_sysfs_preps_rm_dirs(struct damon_sysfs_preps *preps) +{ + preps->nr = 0; +} + +static int damon_sysfs_preps_add_dirs(struct damon_sysfs_preps *preps, + int nr_preps) +{ + preps->nr = nr_preps; + return 0; +} + +static ssize_t nr_preps_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + struct damon_sysfs_preps *preps = container_of(kobj, + struct damon_sysfs_preps, kobj); + + return sysfs_emit(buf, "%d\n", preps->nr); +} + +static ssize_t nr_preps_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_preps *preps; + int nr, err = kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + preps = container_of(kobj, struct damon_sysfs_preps, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err = damon_sysfs_preps_add_dirs(preps, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + + return count; +} + static void damon_sysfs_preps_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_preps, kobj)); } +static struct kobj_attribute damon_sysfs_preps_nr_attr = + __ATTR_RW_MODE(nr_preps, 0600); + static struct attribute *damon_sysfs_preps_attrs[] = { + &damon_sysfs_preps_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_preps); @@ -1149,8 +1198,10 @@ put_preps_out: static void damon_sysfs_probe_rm_dirs(struct damon_sysfs_probe *probe) { - if (probe->preps) + if (probe->preps) { + damon_sysfs_preps_rm_dirs(probe->preps); kobject_put(&probe->preps->kobj); + } if (probe->filters) { damon_sysfs_filters_rm_dirs(probe->filters); kobject_put(&probe->filters->kobj); _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-core-skip-applying-scheme-if-region-split-for-quota-fails.patch mm-damon-paddr-respect-folio-end-for-damos_stat.patch mm-damon-paddr-respect-folio-end-for-damos-actions-except-stat.patch mm-damon-vaddr-respect-folio-end-for-damos_stat.patch mm-damon-vaddr-respect-folio-end-for-damos_migrate_hotcold.patch mm-damon-core-handle-extreme-memory-state-in-damon_get_node_mem_bp.patch mm-damon-core-handle-extreme-memory-state-in-get_node_memcg_used_bp.patch mm-damon-core-handle-extreme-memory-state-in-get_in_active_mem_bp.patch mm-damon-core-introduce-damon_filter_type_pgidle_unset.patch mm-damon-paddr-support-pgidle_unset-probe-filter-type.patch mm-damon-sysfs-support-pgidle_unset-probe-filter-type.patch docs-mm-damon-design-document-pgidle_unset-probe-filter-type.patch mm-damon-core-introduce-damon_prep-struct.patch mm-damon-core-commit-preps.patch mm-damon-core-introduce-damon_operations-prep_probes.patch mm-damon-paddr-support-damon_prep.patch mm-damon-sysfs-implement-preps-directory.patch mm-damon-sysfs-implement-preps-nr_preps-file.patch mm-damon-sysfs-create-directories-for-nr_preps-writes.patch mm-damon-sysfs-implement-prep_action-file.patch mm-damon-sysfs-pass-preps-to-damon-core.patch selftests-damon-sysfssh-test-probe-prep-sysfs-files.patch docs-mm-damon-design-document-probe-preps.patch docs-admin-guide-mm-damon-usage-document-probe-preps-sysfs-files.patch docs-abi-damon-document-probe-prep-sysfs-files.patch