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 9E76E3CB8F5; Tue, 12 May 2026 14:37:07 +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=1778596627; cv=none; b=NWExy7RSYG5d8KhfWduLu+1wcBSbkjbxEIiseT/rY2JadFU2ihGriTFCJJl3WhQbcQupTkbEBx5+ivv7h97VKrQdnixTPQTdhZuIVy0pZPFXSKwMBbWQNb+j7TvMTUBo4IF7FI7DOW5fse72+7O2LbXku3hIytM9OrfV1tZw57w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778596627; c=relaxed/simple; bh=jW0kOVlO76z3Unib/m3BDQZ8Lhaae0dgTTAXYzXNV0c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=slVmevqv9+GYDBQM/viX3wZMttvJE5fsFlLpwJVWg6iWmXnE3w2Op4Y9z7Bj3LMNIGNLUz+CtDiZqB87cqkLXaeJ3hnp9odzI89PjwWYyUbHZpGP3E19olSetrneMt7Hel/5Z9gwELuWzU0UPmsbXTgj3MAOoaVR3d32Vey+qQI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l01JjO28; 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="l01JjO28" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 450FFC2BCFA; Tue, 12 May 2026 14:37:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778596627; bh=jW0kOVlO76z3Unib/m3BDQZ8Lhaae0dgTTAXYzXNV0c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l01JjO28+FAaW8Vmp3vllMET+9x80dN8OmtZhIZxCVkkCjMfYEDbhTzPACiE/nYBg 2f5sKGQSik7yNKUA4x5GmzbfXIxPdFW/0gIBw/G1KNaJq+Wy7+OtdWurh1O07tytbb FuIFgjiuhw5tztw73N+lcHfCCxKSB79yoZDdmw9/zZ9GFiL2P1El1nZqxMcJJaywbg feQHtsZUhBRAKeCXokwowXuWeJU9saxwVsr65Pdv8mx+e433RGp4mzfSaHIUA7Vjs0 vyhxQ4JAtIXvTET4+qtwbdMBOZfaof+OGKIVcHvqaLGoyWCeZCXuhSwAo/MTQo4Znu DpHjS9NUCGUuA== 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 v2 25/28] mm/damon/sysfs-schemes: move memcg_path_to_id() to sysfs-common Date: Tue, 12 May 2026 07:36:40 -0700 Message-ID: <20260512143645.113201-26-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260512143645.113201-1-sj@kernel.org> References: <20260512143645.113201-1-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: 8bit The next commit will need to find the memcg id from the user-passed path to the memory cgroup, from sysfs.c. memcg_path_to_id() is doing that, but defined in sysfs-schemes.c as a static function. Move the function to sysfs-common.c and mark it as non-static, so that the next commit can reuse the function. Signed-off-by: SeongJae Park --- mm/damon/sysfs-common.c | 41 ++++++++++++++++++++++++++++++++++++++++ mm/damon/sysfs-common.h | 2 ++ mm/damon/sysfs-schemes.c | 41 ---------------------------------------- 3 files changed, 43 insertions(+), 41 deletions(-) diff --git a/mm/damon/sysfs-common.c b/mm/damon/sysfs-common.c index 83e24a9b5a0db..bdc6ae2639e4f 100644 --- a/mm/damon/sysfs-common.c +++ b/mm/damon/sysfs-common.c @@ -104,3 +104,44 @@ const struct kobj_type damon_sysfs_ul_range_ktype = { .default_groups = damon_sysfs_ul_range_groups, }; + +static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg, + char *memcg_path_buf, char *path) +{ +#ifdef CONFIG_MEMCG + cgroup_path(memcg->css.cgroup, memcg_path_buf, PATH_MAX); + if (sysfs_streq(memcg_path_buf, path)) + return true; +#endif /* CONFIG_MEMCG */ + return false; +} + +int damon_sysfs_memcg_path_to_id(char *memcg_path, u64 *id) +{ + struct mem_cgroup *memcg; + char *path; + bool found = false; + + if (!memcg_path) + return -EINVAL; + + path = kmalloc_array(PATH_MAX, sizeof(*path), GFP_KERNEL); + if (!path) + return -ENOMEM; + + for (memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg; + memcg = mem_cgroup_iter(NULL, memcg, NULL)) { + /* skip offlined memcg */ + if (!mem_cgroup_online(memcg)) + continue; + if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) { + *id = mem_cgroup_id(memcg); + found = true; + mem_cgroup_iter_break(NULL, memcg); + break; + } + } + + kfree(path); + return found ? 0 : -EINVAL; +} diff --git a/mm/damon/sysfs-common.h b/mm/damon/sysfs-common.h index 2099adee11d05..3079306966a91 100644 --- a/mm/damon/sysfs-common.h +++ b/mm/damon/sysfs-common.h @@ -59,3 +59,5 @@ int damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes, void damos_sysfs_update_effective_quotas( struct damon_sysfs_schemes *sysfs_schemes, struct damon_ctx *ctx); + +int damon_sysfs_memcg_path_to_id(char *memcg_path, u64 *id); diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 43a8224d991e8..6b21bbe97d04a 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -2792,47 +2792,6 @@ const struct kobj_type damon_sysfs_schemes_ktype = { .default_groups = damon_sysfs_schemes_groups, }; -static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg, - char *memcg_path_buf, char *path) -{ -#ifdef CONFIG_MEMCG - cgroup_path(memcg->css.cgroup, memcg_path_buf, PATH_MAX); - if (sysfs_streq(memcg_path_buf, path)) - return true; -#endif /* CONFIG_MEMCG */ - return false; -} - -static int damon_sysfs_memcg_path_to_id(char *memcg_path, u64 *id) -{ - struct mem_cgroup *memcg; - char *path; - bool found = false; - - if (!memcg_path) - return -EINVAL; - - path = kmalloc_array(PATH_MAX, sizeof(*path), GFP_KERNEL); - if (!path) - return -ENOMEM; - - for (memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg; - memcg = mem_cgroup_iter(NULL, memcg, NULL)) { - /* skip offlined memcg */ - if (!mem_cgroup_online(memcg)) - continue; - if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) { - *id = mem_cgroup_id(memcg); - found = true; - mem_cgroup_iter_break(NULL, memcg); - break; - } - } - - kfree(path); - return found ? 0 : -EINVAL; -} - static int damon_sysfs_add_scheme_filters(struct damos *scheme, struct damon_sysfs_scheme_filters *sysfs_filters) { -- 2.47.3