From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) (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 C27E01C862D; Thu, 27 Aug 2026 14:29:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=65.109.113.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787840952; cv=none; b=m6Nh0hbg+x95MZX1zogkA/ZSrgjOZlKKmeAW1ufHSvpUXUXFJyoq4kxQPHyfvz3iDWoCvO4yklx4sGWS1Ka4APiazN3H/GRISNe+NAfRINECRckWkvUxhIinNls6C+Kd8Aib5PkfBUc6VpUOioQNe9AHvMQ6fEtAbbBa6JCNuXE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787840952; c=relaxed/simple; bh=6brJ3I/FMSLxeAu7VYeM5Y1AtwdHO0fwzquf41vQQ9E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=PimSIt1Zut3uGaIw0Is7lRryujgJWFYLxxd3c+S/JN87cZefV3vxiddloNCmP6x0EpFYDyWqa51JBupZV+rFK9WdCLw4yzHCQBJcLbfY9nGm2L4qSF/UDDnzI1QQ4oYvsFXL1CogF0xG1nPlsoZutkASy3RCfhBGI8qOc34F3HE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de; spf=pass smtp.mailfrom=alien8.de; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b=MN8qz0e3; arc=none smtp.client-ip=65.109.113.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alien8.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b="MN8qz0e3" Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id 7539E40E021A; Thu, 27 Aug 2026 14:28:58 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id ObWb8cOFOnty; Thu, 27 Aug 2026 14:28:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1787840928; bh=nH1dEa45oKyEZ+LvyVfaxCb3KtSM1VwnQfe9BHKlGaY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=MN8qz0e3pXb/1DL78Fq1XC5Hr75Pv2Og34nfm4yQbcx7w01QaBJG/Y5t3S6DR2sI4 nOoLvlLbDx8LnDFCYAY0xNz7ApPmo0ahdYGXcdh4rsrUh3g0z8vSAicxm5WVWFtaW1 52O0ix8ZLAqBxTbXYysHq93LeT6UlocQ+hxu+R7fWPZFIxsIDzqzI2xWmvfrXQMHYk atAbPpbg28vUKuk3TX5o2bUydDwdrhQFraiX+GwA6oSu2MwMu+Q8lFgQVcYIDnGGno Rz1JFfDL8uRIqvl5s2HiRr/faX1irlrpjMcEF7xzlFLvg+ABbDF2cl2/DPgkcdryBm +3byy+38iZZV4K093GMSWXW1xH0y/VkjUsiZ5F7otaUWCSHM1eehZ7AyEi4WedT0dO mJkfzfu4bPPO9/vAXINgj9j+NbdD+q4fUQp75bXyWG0Q6oPt7XadqP1/0hgp7DDS8O B/bfpyjo8zFVlHyWITijge1LfQWkEbwasZIlYkYahqFdfqFuNjZo/u9JXJG8qlAfMl 2aDHAwpswfSgkAfGlLFnjO+ScL9AoTMmt6AIgzmkH+RjL6Ep8u7H0403YE5jeJH7jD 6SrlSEuloFfbRCKWfRuSfBRtKZinMIlNkiiKS76uZ8ttPmRKwz/DJ+zeLtIAhtyTDZ H9DcvsVpehYhAg8DxqoEeJz4= Received: from stx.tnic (unknown [IPv6:2600:1700:38ca:c00::42]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id BAF2440E00E6; Thu, 27 Aug 2026 14:28:33 +0000 (UTC) Date: Thu, 27 Aug 2026 07:28:29 -0700 From: Borislav Petkov To: Breno Leitao Cc: "Luck, Tony" , Thomas Gleixner , Ingo Molnar , Dave Hansen , "x86@kernel.org" , "H. Peter Anvin" , Jonathan Corbet , Shuah Khan , Randy Dunlap , "linux-edac@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "kernel-team@meta.com" Subject: Re: [PATCH 2/2] x86/mce: Add mce=panic_on_ce_count to panic on a corrected error flood Message-ID: <20260827142829.GAapBJjfZwSEhZ-_71@fat_crate.local> References: <20260825161625.GAao2_2d3U7xQFgHrw@fat_crate.local> <20260825191555.GCao3p63v3fXzwa7E7@fat_crate.local> <20260825225202.GEao4ckknyv8nRc8Dh@fat_crate.local> <20260826160934.GBao8PvsM8M-U7XuFR@fat_crate.local> 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: On Thu, Aug 27, 2026 at 02:47:11AM -0700, Breno Leitao wrote: > This is a user-configured option; each user picks whatever number > works best for them. > > From a quick look at the Meta fleet, this follows a bi-modal curve: > a bunch of hosts logging a dozen or so, and a few with thousands. So > doing some napkin math, I'd say "many" is around 100ish for Meta > fleet. Sounds to me like this patch should remain in the Meta kernels too then. Because I don't see it being that useful for upstream. > Correct, that's exactly my approach here. > > After X CE errors, we acknowledge that the machine is no longer > stable enough to keep carrying the workload, and simply panic. It's > the last resort: it means lab technicians haven't fixed the problem, > and nobody has gracefully powered off the host either. So panic instead of graceful shutdown. This makes it even more a Meta-only specific approach. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette