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 DFD66513560; Mon, 31 Aug 2026 15:02:36 +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=1788188558; cv=none; b=DvTv4Wdd3V3JTsh7k5WUwWPrpxoRovfd540XOq1uVaCDPdEQO3JwON3qAUpsTXAjkijk3rO6VfJ4bxqgrm3PtXQW+k6TcfD2xgRdCDiZySGSKxlOx9kd7W36AmGUpsj5HvAi8jhINdEmFU6KEx8uyGBjxV6SP43GWNNLRhIOv5s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788188558; c=relaxed/simple; bh=lK0Y/Z334Pbk0QqzoKJO2Co5YZywBcoe4QWXecs3BKw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=arzGh2MyQBnXiYg/SpJKuby1GFYWthPuFsmJZLO2XXGar4y0S9qKBEvLMUGeIL7Sipot8G26rYiYT76Zb0R6aCTiEXymymu4m1EpPYujPu847n71LabK58V4YUqMVCVSFtN3AyVBos/EPgJANKPdZJJ6HsmCvX6y/V0YHBGIVno= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=K67QxRPW; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="K67QxRPW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E9A51F00A3F; Mon, 31 Aug 2026 15:02:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788188556; bh=yXn4FOiKb4JIWcSHZNBTe6EO/erUpMh++SEHXjVqCNw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=K67QxRPWwOvBzIuBi7VnzhsuXPxPepi/qpbAN0usUjIR9TeEMc+UwvMUAnDamy07U lw0WLuJjhWOPchA+iSwH/5ofeDhdsqFVq0kawpyRUGNjla7c9JvDfoW28/7ALet/5v rgMu+miDMDpojnONyalNpbR4UHz76N2Cc4g///DEOm4v2UaYykh35UvVy64oh1AQfZ ihlTSC/9Gk+dVFsQvfnZh/4/qA1JySu1qXkqdalz2fttrXGC/CkGce9LtR9zNkYvTb hsebKie7WeST3NOGnUbdrA6T/Fc/jUSjnTkgHq0RSJoojP19XsPto1R+oyx7ry7TiF 6a5Ko+15QDoyQ== From: SJ Park To: Andrew Morton Cc: Liew Rui Yan , "Liam R. Howlett" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Randy Dunlap , SJ Park , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v3 2/3] docs/mm/damon/design: difference between watermarks and nr_snapshots Date: Mon, 31 Aug 2026 08:02:25 -0700 Message-ID: <20260831150227.83416-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260831150227.83416-1-sj@kernel.org> References: <20260831150227.83416-1-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 From: Liew Rui Yan Explain the difference between nr_snapshots reaches max_nr_snapshots and watermarks. Signed-off-by: Liew Rui Yan Reviewed-by: SJ Park Signed-off-by: SJ Park --- Documentation/mm/damon/design.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index af94fc27890b8..74170a2285501 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -874,7 +874,8 @@ the action to the region will fail. Unlike normal stats, ``max_nr_snapshots`` is set by users. If it is set as non-zero and ``nr_snapshots`` be same to or greater than ``nr_snapshots``, the -scheme is deactivated. +scheme is deactivated. Note that, unlike watermarks, even if a scheme's +``nr_snapshots`` reaches ``max_nr_snapshots``, monitoring will not stop. To know how user-space can read the stats via :ref:`DAMON sysfs interface `, refer to :ref:s`stats ` part of the -- 2.47.3