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[195.250.132.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47787e2bcf9sm163601805e9.3.2025.11.14.10.21.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Nov 2025 10:21:48 -0800 (PST) From: =?UTF-8?q?Michal=20Koutn=C3=BD?= To: cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Natalie Vock , Maarten Lankhorst , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Tejun Heo , Johannes Weiner , Jonathan Corbet Subject: [PATCH v2 1/3] docs: cgroup: Explain reclaim protection target Date: Fri, 14 Nov 2025 19:21:25 +0100 Message-ID: <20251114182130.1549832-2-mkoutny@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251114182130.1549832-1-mkoutny@suse.com> References: <20251114182130.1549832-1-mkoutny@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The protection target is necessary to understand how effective reclaim protection applies in the hierarchy. Signed-off-by: Michal Koutn=C3=BD --- Documentation/admin-guide/cgroup-v2.rst | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-= guide/cgroup-v2.rst index 0e6c67ac585a0..97a9f8a046c5f 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -53,7 +53,8 @@ v1 is available under :ref:`Documentation/admin-guide/cgr= oup-v1/index.rst ; Fri, 14 Nov 2025 18:21:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.53 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763144513; cv=none; b=My5tH6KJ//ieHxQfRBkzgHZ2nrx0TkxFhKUG8MWHsg73SYuMz8jcXK/PKcs6I8gaetJ6g3aGJLiDHpG27CcwmFMlEp9QhRUFNCcQzLNOQqu4wcqWch0VzetTKcDs99uk+VnNb3bz2bye6WMF9RaH5J8Q1Toi5T8n99lc84teEBs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763144513; c=relaxed/simple; bh=08YHyxLxXktBFFkSp4yhcpSImQHSDMqN6sOacEYT/n0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=GsRRSPqwOWFEJI6pO0b2DtUpbqC1Qche0J2nCHXg9s7opbSEzLCYFfO9gyi4pTf1VDIwNd3+R783q37+XDuE+Sxy2MvN2JcEve2tNFYGJhJxXLxtaNLtWtTPAF6i6daqUD5NemwYNVyvHjZth10b05FQjn3LjNHzbpdce69D1Bk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b=bfQMXj91; arc=none smtp.client-ip=209.85.128.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=suse.com header.i=@suse.com header.b="bfQMXj91" Received: by mail-wm1-f53.google.com with SMTP id 5b1f17b1804b1-4711810948aso15789545e9.2 for ; Fri, 14 Nov 2025 10:21:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1763144510; x=1763749310; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=c0Jh/y4rd6bYusl1JR/88Fg9gHoGK00Wwjf0mTqgXuY=; b=bfQMXj91woZAI+7gyL9UGVVG4vjjPP5XvAOicjucSdTx3nReZtFNoBPdmtQdMPs8FC 4YeZhJdT97c6MnMZNsdUPhPXZjSLGMcIdNrWjwnT2ZE51/x6hEFtLxtGkLCNV2DXJbqI hZtyi98pgggdB1CkEb1WYCiqkjPyjFok8dnev0ny5H8dPhHT4qpETHSowrpR7sib/67Z eE8I6C20S+mQCPaxsHH1wvsHgdf8H6MeUU0fTroL+7Mfwc+afstuoAdqLHc1XR4NJX84 LTdArOtE1VjOVOy03GY+P1GDa6HQ9Z5ZuwXj+Wn7xHQ0S9ycvZusshXc6ubmd8S+RLrz iHIw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763144510; x=1763749310; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=c0Jh/y4rd6bYusl1JR/88Fg9gHoGK00Wwjf0mTqgXuY=; b=YR4qJFIR/6g54XrRwu+BaGdqAzj3fi+p7OZPjhjQBwpDVhbp/XfrgjVzcbmYqnwnXk X8Pust9fNHjLN4OfRtx6G1sbMD8HZwbGEPrNs1gz8TzTrqhyqgqFSUOPl0rPZqVuosOs 63uq0JGWAVqSe1ZvA4CZ/OgvJNHbMsI4rGUNRZ2N0hlzQtsW+2y6dFvkwqd3l/AYgh2A 5woobvPKiQxptieSCtSkNqSX2tMr8/hL1tBXT+GKq08cz2KVFUgB7KUxp4ycsAr4o6Bi ZQxO+LTRwspqHAICd+xmLduDeK60i3+z2j5poCbVk2A+J5pJcxvUmhFa7F+k14iPPWTv m6OQ== X-Forwarded-Encrypted: i=1; AJvYcCUFimgk6KQwR2vBHX+BPI2FqSZh6WYGg6QGJRJbIPkjK7VpC9VjnhX6LqTiQDC7hY6/tl87Y/HnjFMAJk4=@vger.kernel.org X-Gm-Message-State: AOJu0YyjQXAyPheuocRYnZCRdOmK+EY1FTbyCB8iX30N0REGCTnsSuzR 7RprZCUl+tRK+eIXi10IVmi9SeO/J2+QcYVzhlHd+uwsKK6+kdfXnFYdyw5TUHL84Ds= X-Gm-Gg: ASbGncscsUHBahQ6B+Psoy0tRufcp3fI3ErPEvyTBVC2G+M62ArTFQvI/PwXGW2Qmr5 XRXjvtcLemkFWy/JnLWxeFaZsGVbZ6AupiCOM903C4mmYWJakdthrPOUTD0VTY8qPpTmuWoeTMH 2rqR2ktvdab/MccjzR1+i5/iqT4jmnLN/ok6zCDd9CfNQxC47thY/jU56jjTMeuaLzdCRG+jpHn mn8YmDEWWKm6w6F6hEk1Y3V3V/8FUaPe6hvxZgd38UXX/friPnPcCqhUK/eMgVbWUfMAgWpn5oC jFVSH2rOf3e8SiVdzAgzVr5+rkgEpCAK+03QMIFNajI05JbRU78EcvUGZFOgomdHqX1qLrYxfxb C2DsoXOuGG0fDrrJbZKQPA61IdQoJibwr2ZVkZ0dSgI6XV4x6bhJd1WJ5mPzv2VJaiP3aGUh+pj briol51K+9pUKyFo9vH5ZY X-Google-Smtp-Source: AGHT+IH4LYcmx2WzqwQB8AbvnXVanJ3gtD76gT7XHcpAH1DooanzMDiXV8K06l1AzX/FmT+O/TcBRQ== X-Received: by 2002:a05:600c:3546:b0:477:7658:571e with SMTP id 5b1f17b1804b1-4778fea2df4mr43176505e9.23.1763144509812; Fri, 14 Nov 2025 10:21:49 -0800 (PST) Received: from blackdock.suse.cz (nat2.prg.suse.com. [195.250.132.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47787e2bcf9sm163601805e9.3.2025.11.14.10.21.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Nov 2025 10:21:49 -0800 (PST) From: =?UTF-8?q?Michal=20Koutn=C3=BD?= To: cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Natalie Vock , Maarten Lankhorst , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Tejun Heo , Johannes Weiner , Jonathan Corbet Subject: [PATCH v2 2/3] docs: cgroup: Note about sibling relative reclaim protection Date: Fri, 14 Nov 2025 19:21:26 +0100 Message-ID: <20251114182130.1549832-3-mkoutny@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251114182130.1549832-1-mkoutny@suse.com> References: <20251114182130.1549832-1-mkoutny@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Signed-off-by: Michal Koutn=C3=BD --- Documentation/admin-guide/cgroup-v2.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-= guide/cgroup-v2.rst index 97a9f8a046c5f..e0a659474fa47 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1952,6 +1952,10 @@ When the reclaim targets ancestors of A, the effecti= ve protection of B is capped by the protection value configured for A (and any other intermediate ancestors between A and the target). =20 +To express indifference about relative sibling protection, it is suggested= to +use memory_recursiveprot. 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[195.250.132.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47787e2bcf9sm163601805e9.3.2025.11.14.10.21.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Nov 2025 10:21:50 -0800 (PST) From: =?UTF-8?q?Michal=20Koutn=C3=BD?= To: cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Natalie Vock , Maarten Lankhorst , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Tejun Heo , Johannes Weiner , Jonathan Corbet Subject: [PATCH v2 3/3] docs: cgroup: No special handling of unpopulated memcgs Date: Fri, 14 Nov 2025 19:21:27 +0100 Message-ID: <20251114182130.1549832-4-mkoutny@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251114182130.1549832-1-mkoutny@suse.com> References: <20251114182130.1549832-1-mkoutny@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The current kernel doesn't handle unpopulated cgroups any special regarding reclaim protection. Furthermore, this wasn't a case even when this was introduced in bf8d5d52ffe89 ("memcg: introduce memory.min") Drop the incorrect documentation. (Implementation taking into account the inner-node constraint may be added later.) Signed-off-by: Michal Koutn=C3=BD --- Documentation/admin-guide/cgroup-v2.rst | 3 --- 1 file changed, 3 deletions(-) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-= guide/cgroup-v2.rst index e0a659474fa47..4c072e85acdfe 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1327,9 +1327,6 @@ PAGE_SIZE multiple when read back. Putting more memory than generally available under this protection is discouraged and may lead to constant OOMs. =20 - If a memory cgroup is not populated with processes, - its memory.min is ignored. - memory.low A read-write single value file which exists on non-root cgroups. The default is "0". --=20 2.51.1