From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 8763C39B95B; Wed, 25 Mar 2026 09:56:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774432596; cv=none; b=nB5oLS5Jozi9KqwGmQ3iAgWyS0o7evtn3tT+3GMFf4xxUMsqlqRpcA2QP7v90VQaP8bdvP++V6xfOl7AILM3EOQcBC3TLeNT5v49ZZI4+7/v7V+7X+9DBkrqXvq/xhKFxKAz7dCgEuiOZNOC1GGWqwUrsmMmSTiNWKfRKToxbfo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774432596; c=relaxed/simple; bh=lzJB7EbrHC2KlsN4ad0AIXE/JqPFffVa4MuVG4nprqg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=raTjEddeQBovwkbFUEEiKFkLoQvedeuOaQHOsI2Vmh6yYDzTA4GLn9GxJB/FiBy4xO1NQ1ZTbp7mwtHRQdAbYk3M3U+d2+1mezHUUA4uN9zUpGr4y71q4L4ribTipnnMqWNf+uAtB6pQsFzHhwk2WgKcSYdVTTAPIuoYj0P1Tng= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=dyZRqhwm; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=j67m7QkG; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="dyZRqhwm"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="j67m7QkG" Date: Wed, 25 Mar 2026 10:56:25 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1774432587; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=yo43Mk65qIi3fVAhr90NoZvnNv04dJVqhDfc2jkLXUQ=; b=dyZRqhwmGHRDBqNCP852OEwrrmdokd34RZ/dh8iqvruAekLf8RyRGlDLGQv+eTIismmwBj Wsz4q+/tf7RMcexbIk/sVSloNGDErormvM6oPtoTYRs21dU4vGJz0OICF1KE2mFSKSp2g9 s/26/SVQrgsNMuqEKAoE5QPs+KqYkTmSNSxHoEyrG4DlyktJ/HFheZh2H8FKk5gj8HVEk7 mryOkXOczNrmtI9yjk4cgAyizmOTH1YjJqJM10IypzIcHXVmhG/X8XjAqpJhp6sLMURRSO GJWdeeTFzV1dtEV4XZp3tEyvdkkUmVsnwFoG9tNejcsSQyES3XiYjPSLjNNDJQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1774432587; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=yo43Mk65qIi3fVAhr90NoZvnNv04dJVqhDfc2jkLXUQ=; b=j67m7QkG/T09g7TX1updhEyOfg/iinv6Be6bYTMWphS/myAxELmqHSaQmKRY0fHCEn+qF8 aqN+p9bt5i8aOtBQ== From: Sebastian Andrzej Siewior To: Waiman Long Cc: Frederic Weisbecker , LKML , Anna-Maria Behnsen , Gabriele Monaco , Ingo Molnar , Jonathan Corbet , Marcelo Tosatti , Marco Crivellari , Michal Hocko , "Paul E . McKenney" , Peter Zijlstra , Phil Auld , Steven Rostedt , Thomas Gleixner , Valentin Schneider , Vlastimil Babka , linux-doc@vger.kernel.org Subject: Re: [PATCH] doc: Add CPU Isolation documentation Message-ID: <20260325095625.dFHbtoPr@linutronix.de> References: <20250809094247.8384-1-frederic@kernel.org> <20260324153823.VKwebBuG@linutronix.de> <579827ac-a933-45ec-b396-01656c30c9e4@redhat.com> <20260324164005.eBNX2ppQ@linutronix.de> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260324164005.eBNX2ppQ@linutronix.de> On 2026-03-24 17:40:07 [+0100], To Waiman Long wrote: > On 2026-03-24 12:00:17 [-0400], Waiman Long wrote: > > > while looking at this again, shouldn't you also do > > > echo 7 > cpuset.cpus.exclusive > > > > > > to ensure the CPU isn't used somewhere else? > > > > For backport compatibility, the use of cpuset.cpus.exclusive is optional for > > creating a local partition underneath the cgroup root. The example should > > still work without setting cpuset.cpus.exclusive. > > I would have to double check but I think only after the > cpuset.cpus.exclusive the CPU vanished from the cpumask of my current > task. Let me take that back. After setting cpuset.cpus.partition the CPU mask of the remaining tasks gets updated. All good. > > Cheers, > > Longman > Sebastian