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[195.250.132.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4775ce32653sm336766725e9.13.2025.11.10.11.36.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Nov 2025 11:36:44 -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 RESEND 1/3] docs: cgroup: Explain reclaim protection target Date: Mon, 10 Nov 2025 20:36:33 +0100 Message-ID: <20251110193638.623208-2-mkoutny@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251110193638.623208-1-mkoutny@suse.com> References: <20251110193638.623208-1-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..a6def773a3072 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 ; Mon, 10 Nov 2025 19:36:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762803409; cv=none; b=KUSg1oFsAo8Ld5ZGtU8PyHGSLmUIQYoU6ytvRQG4JCUQzBMbH3Q+a2RvsjWx2xexcDfw+/mwJYgfHz/QlobVWDsiTmaPT/oG6Pl9c3Z/t+bi2/9IFC+tujiWEyPxuE7l0axPthMpdwwp5vcJAwKaxiJRo6Dl/qpuRYmhhigLObE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762803409; c=relaxed/simple; bh=W7QWppO42nNFunrHW0x5wrq6A32TuLyhp6ZUGiac+bQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=airWJlPPfY2FerQeUtz9B39knV/Co2GCK2x9RsofDKI563wHAdUh4wHF0fLwrIMKOYZRqFIxDHO/jWnjYnTFRu/xn3t37wiKNlr44pWoVOc8T8qQjfE24dw2VS5w44QV0YdeD8CnaBMQ42/h3mIiRsf19ddFR0OTMUDeN0pRoIE= 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=Bmtp8f3i; arc=none smtp.client-ip=209.85.128.43 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="Bmtp8f3i" Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-477632d45c9so23241695e9.2 for ; Mon, 10 Nov 2025 11:36:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1762803406; x=1763408206; 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=YTWCP6bTspm09Lx1U+q7f0BGQls8hOwZj+qwEbwY0Hk=; b=Bmtp8f3ihF437cwFJkONx0B0z3nb9BTfIdUZ/AhBRg7D7HpbJAv5crsHZjdQXgOeAA MiFifiCKwN691N/naK0GgAf+AEX0SW8TkBtumqkTk8VUPVmu0BN8Ek6bfoUEl2NOvZwZ 1+vbmjJKUbZCPhIzuIbZ5Z8doWYwBNLaWWwHRpBXfzVE0nozaesXeNoOMOQ/dfcCGdAn ijV0M8LOn8zJa63WmV73roZn01oCXnFN9Z8DAmAecfsEfikoWLPGdyJFMbDNcmdXEigD 1AZOAKeAvKjuklN3446J4X7w7SxVqIqKfSaX0rA0DiJ0QU6uTUv+Py4lNw0p8PgErjQe 4+kg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762803406; x=1763408206; 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=YTWCP6bTspm09Lx1U+q7f0BGQls8hOwZj+qwEbwY0Hk=; b=kVQYT2QbATy7MyjC+vc89YaVC1syhErhhZiq3p0AVyuH4rVe4TORjzI3ErjKbZ/bPY tzjbaBNU1tuIyfTBl/Or3+QZULSOv/IJ3Bgd9xvpLenKRk09Ywb67HRLkWavgihDjRST eTgsUm9t4vSrl9Yq7f6eWUbr9m+g5+kOCO2lXe4IqNms7AcePsyvwOuPEtUCcjsZjhpQ fjkr+iXNe9iEZ1MPbC767krxshU+qUIYdyBOXJRTI+DIIAeCbFFJ4P1OOTt0WR9xO1fi IkqACGmVQniiHLrXUQAaEL/5CXdPDj2+N4fPHxjm6qVpFc9cLVM7iubW5CSADzYKiS9T DxPw== X-Forwarded-Encrypted: i=1; AJvYcCULUnRGF8HFDGdns+D0ogtw0EYsTaA8HkG36fe6CvS0PH75r0PZuZDIdr0YWUXXjuuA5o/X1u7Vy8gkr+8=@vger.kernel.org X-Gm-Message-State: AOJu0YxH6lnZN/SVcbOikEHsNTtEsspR6EqZYq7Y2mnP+orqwWBpiVj6 uhAFlAALuNzggnJ01LmgGUGS7IiZHTm6N3U4sPqRvjoFkrCp1CzA1RDD3CdpTg+e/os= X-Gm-Gg: ASbGncuNkmtGtqTaDHE1rvd8LiefYxHg559LJ7n0cSkpX3L4Z54pqK4dBGbCG7vHqJH o+0DddtGMG7hhamjXc+f6EOA7MbbJfPBk7ID/sPhDMx0ub3Xe2X9yaG2Dwmf1v9Y5+6+93HVhV9 De0cDWixhJSWAeHXtTczMZHV/cwySuP3c2IRpc7FFI8KqnOFPdnwIeMTBBzQdIqvC2P/x1FZDmW dqhnKPHbdkeB/sUkBhxv7ksotMacFiJ2AwfNuER3K3Xpwl3/i9vWWoGjpMPUCvQyzZvMmMDZ1yh vUcpQwnAx6EDBausjhSp90kiomm4FUoxKi5CBAg/x0PY7Qin4AtjBZmEI9UB341qr9kxpTiQk/E ufucbpJaYWi7K3oqXV3xZnVMK1Wd4IUDrK+Lf2Qm0Cxo1li6TG1sbU9aRcIgJs0zKnbxq7o8mbB UW2e8EUV0MDGobjdUFaD4X89jUwkZ/frY= X-Google-Smtp-Source: AGHT+IFUxtkfJc5KA5FIRPDpNTMLzR7n8nqQXez/mScawaL2NDNh5hWWSSs2Qhhirt5MIsnvEx4uwA== X-Received: by 2002:a05:600c:46d0:b0:45d:d8d6:7fcc with SMTP id 5b1f17b1804b1-4777327b249mr88103205e9.27.1762803405768; Mon, 10 Nov 2025 11:36:45 -0800 (PST) Received: from blackdock.suse.cz (nat2.prg.suse.com. [195.250.132.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4775ce32653sm336766725e9.13.2025.11.10.11.36.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Nov 2025 11:36:45 -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 RESEND 2/3] docs: cgroup: Note about sibling relative reclaim protection Date: Mon, 10 Nov 2025 20:36:34 +0100 Message-ID: <20251110193638.623208-3-mkoutny@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251110193638.623208-1-mkoutny@suse.com> References: <20251110193638.623208-1-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 a6def773a3072..be3d805a929ef 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1952,6 +1952,10 @@ targets ancestors of A, the effective protection of = B is capped by the protection value configured for A (and any other intermediate ancestors be= tween 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 5b1f17b1804b1-4775ce32653sm336766725e9.13.2025.11.10.11.36.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Nov 2025 11:36:46 -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 RESEND 3/3] docs: cgroup: No special handling of unpopulated memcgs Date: Mon, 10 Nov 2025 20:36:35 +0100 Message-ID: <20251110193638.623208-4-mkoutny@suse.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251110193638.623208-1-mkoutny@suse.com> References: <20251110193638.623208-1-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 be3d805a929ef..84985bb20c452 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