From nobody Sun Feb 8 21:46:17 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 6384E33291F; Fri, 17 Oct 2025 21:27:15 +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=1760736435; cv=none; b=VlEvTPbgBgPbvNGpLog/9Kylooo5Y0ZTds0OnjN00VUVoU4yfacSp/kSVz0FiykMu6BE8IVOBRtwiGV+nviPOgdG4b35Fqm3xUz6varKKX1k4M+rUj9mjrlxChwOxNNmC8Jzy+QwLrmqo7uc0i+4S9sQ+K1JNmNmE1DyFdWQT7o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760736435; c=relaxed/simple; bh=r1QRmbQ0ckNwsPpAqp/NhFI/Nrd0yqfQwVomPU13aMY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iTGRP9Hask+/mibb7FsG9/JBJmAZAa3dqt6IU5JnXqv8bJVcR3HO7xhMOo5NwozsX4ngdnZs8QYG4P7bfzIgqwOxveuYbRv8PR2bzS3vGTqgByC/ai4lCoHjNjypGRoiJIBWRpKkWG/VpWe3TcUWKwqv5iYP6aGg8fxolktrABk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=m1sivf6R; 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="m1sivf6R" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 309B6C4CEE7; Fri, 17 Oct 2025 21:27:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760736435; bh=r1QRmbQ0ckNwsPpAqp/NhFI/Nrd0yqfQwVomPU13aMY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m1sivf6RmIIQvpCVclfSkMGi4RwQqfkkqwO/EvMqrM3e6n5P0vuBS65Lruodm8a+5 t1LNAPUE6FG8euuAYXE6vUvVNSbSuiGSFrW9WArIO4o3tkmf1J7534dVJmdoohiYcJ LZcDqyHKiQurrcu5H1bhVpM0kqV8EtlQTPkaR1vH0HIqo2e1UVbjQL3D+5FT7tlnOY XeHSY9ogCR6P0jmgyndjG86U+5F/HkdIuYHJDnWPaTFbsmoyjo/HxKMJXH3CkFRxwa gaqrrtZgDC6JGqgx/bjdmpV6xSXN9cJjdShYRc10I7J1p2ggtGrm5/cHFsduYzNYB7 +WkS7PnxXomhg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 06/10] mm/damon/core: add DAMOS quota gaol metric for per-memcg per-numa free memory Date: Fri, 17 Oct 2025 14:26:58 -0700 Message-ID: <20251017212706.183502-7-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251017212706.183502-1-sj@kernel.org> References: <20251017212706.183502-1-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 a variant of DAMOS_QUOTA_NODE_MEMCG_USED_BP, for the free memory portion. The value of the metric is implemented as the entire memory of the given NUMA node subtracted by the given cgroup's usage. So from a perspective, "unused" could be a better term than "free". But arguably it is not very clear what is better, so use the term "free". Signed-off-by: SeongJae Park --- include/linux/damon.h | 6 ++++-- mm/damon/core.c | 10 ++++++++-- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index 862531f1a379..9ee026c2db53 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -148,6 +148,7 @@ enum damos_action { * @DAMOS_QUOTA_NODE_MEM_USED_BP: MemUsed ratio of a node. * @DAMOS_QUOTA_NODE_MEM_FREE_BP: MemFree ratio of a node. * @DAMOS_QUOTA_NODE_MEMCG_USED_BP: MemUsed ratio of a node for a cgroup. + * @DAMOS_QUOTA_NODE_MEMCG_FREE_BP: MemFree ratio of a node for a cgroup. * @NR_DAMOS_QUOTA_GOAL_METRICS: Number of DAMOS quota goal metrics. * * Metrics equal to larger than @NR_DAMOS_QUOTA_GOAL_METRICS are unsupport= ed. @@ -158,6 +159,7 @@ enum damos_quota_goal_metric { DAMOS_QUOTA_NODE_MEM_USED_BP, DAMOS_QUOTA_NODE_MEM_FREE_BP, DAMOS_QUOTA_NODE_MEMCG_USED_BP, + DAMOS_QUOTA_NODE_MEMCG_FREE_BP, NR_DAMOS_QUOTA_GOAL_METRICS, }; =20 @@ -183,8 +185,8 @@ enum damos_quota_goal_metric { * If @metric is DAMOS_QUOTA_NODE_MEM_{USED,FREE}_BP, @nid represents the = node * id of the target node to account the used/free memory. * - * If @metric is DAMOS_QUOTA_NODE_MEMCG_USED_BP, @nid and @memcg_id repres= ents - * the node id and the cgroup to account the used memory for. + * If @metric is DAMOS_QUOTA_NODE_MEMCG_{USED,FREE}_BP, @nid and @memcg_id + * represents the node id and the cgroup to account the used memory for. */ struct damos_quota_goal { enum damos_quota_goal_metric metric; diff --git a/mm/damon/core.c b/mm/damon/core.c index 00f1686d767f..82546d138a5a 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -790,6 +790,7 @@ static void damos_commit_quota_goal_union( dst->nid =3D src->nid; break; case DAMOS_QUOTA_NODE_MEMCG_USED_BP: + case DAMOS_QUOTA_NODE_MEMCG_FREE_BP: dst->nid =3D src->nid; dst->memcg_id =3D src->memcg_id; break; @@ -2046,7 +2047,7 @@ static unsigned long damos_get_node_memcg_used_bp( { struct mem_cgroup *memcg; struct lruvec *lruvec; - unsigned long used_pages; + unsigned long used_pages, numerator; struct sysinfo i; =20 rcu_read_lock(); @@ -2066,7 +2067,11 @@ static unsigned long damos_get_node_memcg_used_bp( used_pages +=3D lruvec_page_state(lruvec, NR_INACTIVE_FILE); =20 si_meminfo_node(&i, goal->nid); - return used_pages * 10000 / i.totalram; + if (goal->metric =3D=3D DAMOS_QUOTA_NODE_MEMCG_USED_BP) + numerator =3D used_pages; + else /* DAMOS_QUOTA_NODE_MEMCG_FREE_BP */ + numerator =3D i.totalram - used_pages; + return numerator * 10000 / i.totalram; } #else static __kernel_ulong_t damos_get_node_mem_bp( @@ -2101,6 +2106,7 @@ static void damos_set_quota_goal_current_value(struct= damos_quota_goal *goal) goal->current_value =3D damos_get_node_mem_bp(goal); break; case DAMOS_QUOTA_NODE_MEMCG_USED_BP: + case DAMOS_QUOTA_NODE_MEMCG_FREE_BP: goal->current_value =3D damos_get_node_memcg_used_bp(goal); break; default: --=20 2.47.3