From mboxrd@z Thu Jan 1 00:00:00 1970 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 C1EC347A0D0; Wed, 1 Apr 2026 16:27:06 +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=1775060826; cv=none; b=a+8mymWPZGfIcc32hW9LyIAU3/VlHZRxjAGVKpwaQYoEzvF4IuvugRUjUQO+jjCD6GYMMCQbjo5DMUnBnX+WnSDXsrhrlZJKKOiLEuyPxqNFQ/nSdT+X+8DQsk/x36YV3o7OMXKIPuv7tuaLOINQSL149kaYMziaULaMgNpkPCc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775060826; c=relaxed/simple; bh=qvOJix5Rxwc9sdpsH9CobjZ1ASdx57nkq/57g07ShDY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BfPJHhDKbBNm4j3oauJSEdGBtjS76fz1UvRD+IL4UMqHlpo+qaTuNDlRio5Aqv8e75ek8mvrMc6zPWejfA7hWTEnEC1AJmNpsxbSRc4/xk//+wlH6A1Nt43qJehRlPVAUcgfkjg4pS7rI9q0piMDbmIk2luO5j1FaVC8fo48/eY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=X7n+0JD2; 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="X7n+0JD2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC4A6C2BCAF; Wed, 1 Apr 2026 16:27:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775060826; bh=qvOJix5Rxwc9sdpsH9CobjZ1ASdx57nkq/57g07ShDY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=X7n+0JD2uH+l3RwCMkGl6pQIi+znzso60mgBrCG9yeHxgpor1jmmJ4c9QcygjQqD+ eX0AyWzsBagSMFFn/mrD1pHsX1digVY4+XVsifA5nI5bkkuFe4SzL8QMROoITiVtCZ VzI5NtFV7vnkcIItzxxMPu+0xLbQGhtmVAn4hwEgsfJ3aHMxs90Q7Dn+WlzqtKwA9k Xd/kGSN2goq1pT/8YaK0TMG5rRmipBET7a8uzRX5qKJE8a8JclWOiKxdSsPNQVGb7h h1fncA0LQHGgFqMQmE9SCFbMLLZBkRNxt0OTIBWa7xvejjiD00oNfZeZqZHdV3i0BF PGhesc5EQ0U+A== Date: Wed, 1 Apr 2026 18:27:03 +0200 From: Frederic Weisbecker To: Randy Dunlap Cc: 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 , Waiman Long , linux-doc@vger.kernel.org, Sebastian Andrzej Siewior , Bagas Sanjaya Subject: Re: [PATCH v2] doc: Add CPU Isolation documentation Message-ID: References: <20260326140055.41555-1-frederic@kernel.org> <6d113021-6208-4dcc-a209-a2317d680e3f@infradead.org> 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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <6d113021-6208-4dcc-a209-a2317d680e3f@infradead.org> Le Thu, Mar 26, 2026 at 02:42:32PM -0700, Randy Dunlap a écrit : > (Just some small comments -- take them or not.) > > On 3/26/26 7:00 AM, Frederic Weisbecker wrote: > > nohz_full was introduced in v3.10 in 2013, which means this > > documentation is overdue for 13 years. > > > > Fortunately Paul wrote a part of the needed documentation a while ago, > > especially concerning nohz_full in Documentation/timers/no_hz.rst and > > also about per-CPU kthreads in > > Documentation/admin-guide/kernel-per-CPU-kthreads.rst > > > > Introduce a new page that gives an overview of CPU isolation in general. > > > > Signed-off-by: Frederic Weisbecker > > --- > > v2: > > - Fix links and code blocks (Bagas and Sebastian) > > - Isolation is not only about userspace, rephrase accordingly (Valentin) > > - Paste BIOS issues suggestion from Valentin > > - Include the whole rtla suite (Valentin) > > - Rephrase a few details (Waiman) > > - Talk about RCU induced overhead rather than slower RCU (Sebastian) > > > > Documentation/admin-guide/cpu-isolation.rst | 357 ++++++++++++++++++++ > > Documentation/admin-guide/index.rst | 1 + > > 2 files changed, 358 insertions(+) > > create mode 100644 Documentation/admin-guide/cpu-isolation.rst > > > > diff --git a/Documentation/admin-guide/cpu-isolation.rst b/Documentation/admin-guide/cpu-isolation.rst > > new file mode 100644 > > index 000000000000..886dec79b056 > > --- /dev/null > > +++ b/Documentation/admin-guide/cpu-isolation.rst > > @@ -0,0 +1,357 @@ > > +.. SPDX-License-Identifier: GPL-2.0 > > + > > +============= > > +CPU Isolation > > +============= > > + > > +Introduction > > +============ > > + > > +"CPU Isolation" means leaving a CPU exclusive to a given workload > > +without any undesired code interference from the kernel. > > + > > +Those interferences, commonly pointed out as "noise", can be triggered > > nit: "noise," Thanks! I have applied all your suggestions, except this one for now because I don't really understand the typo rule behind. Any hint? -- Frederic Weisbecker SUSE Labs