From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E161D591A5 for ; Tue, 19 Nov 2024 16:45:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0041C6B0082; Tue, 19 Nov 2024 11:45:33 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id ECE796B0096; Tue, 19 Nov 2024 11:45:32 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D48586B0098; Tue, 19 Nov 2024 11:45:32 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id B0FB96B0082 for ; Tue, 19 Nov 2024 11:45:32 -0500 (EST) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 3B97B16066F for ; Tue, 19 Nov 2024 16:45:32 +0000 (UTC) X-FDA: 82803419076.12.6869FA5 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf29.hostedemail.com (Postfix) with ESMTP id 373F9120013 for ; Tue, 19 Nov 2024 16:44:22 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=none; spf=pass (imf29.hostedemail.com: domain of "SRS0=f8Hu=SO=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=f8Hu=SO=goodmis.org=rostedt@kernel.org"; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1732034549; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aEU3UBcufStgR5kE2OaU2JKX9cSO7PCvT3/TWErspf0=; b=MeubCyBJbxXslkRwOh5Imy5YUHJ5YqkWtErkR8tmh5L2GyTzugdUqqOuk7fM3aWGwch5pY DaVkmK4w5CO7z8Qq6Ozvng1WVLuvht21Mwne1iLfrvxCKn5HG5fmUwf8cIvtHxC7ztIy0j EoCp/ImXiRACSqAwcLi9R7BDR8iJFrk= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=none; spf=pass (imf29.hostedemail.com: domain of "SRS0=f8Hu=SO=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=f8Hu=SO=goodmis.org=rostedt@kernel.org"; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1732034549; a=rsa-sha256; cv=none; b=EdV4jyPwcctz1Y6/kGDamSd3qvIGSQ9vUkbrg5pxICbxoYagwt3io+3NjWtBX/1My4QwRp QMK1dp2EknD61K0aDenSouzOSb5evpaDT/sAPNhg1yOW3dsrBl61dz4ubm8hgfPbrts6Re c5o9WKQqa8RaYr1MQASbdIs3NFn0+NM= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 8699D5C5741; Tue, 19 Nov 2024 16:44:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA3A1C4CECF; Tue, 19 Nov 2024 16:45:22 +0000 (UTC) Date: Tue, 19 Nov 2024 11:45:56 -0500 From: Steven Rostedt To: Valentin Schneider Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, x86@kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org, Masami Hiramatsu , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Andy Lutomirski , Peter Zijlstra , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Josh Poimboeuf , Jason Baron , Kees Cook , Sami Tolvanen , Ard Biesheuvel , Nicholas Piggin , Juerg Haefliger , Nicolas Saenz Julienne , "Kirill A. Shutemov" , Nadav Amit , Dan Carpenter , Chuang Wang , Yang Jihong , Petr Mladek , "Jason A. Donenfeld" , Song Liu , Julian Pidancet , Tom Lendacky , Dionna Glaze , Thomas =?UTF-8?B?V2Vpw59zY2h1aA==?= , Juri Lelli , Marcelo Tosatti , Yair Podemsky , Daniel Wagner , Petr Tesarik Subject: Re: [RFC PATCH v3 00/15] context_tracking,x86: Defer some IPIs until a user->kernel transition Message-ID: <20241119114556.0949b562@gandalf.local.home> In-Reply-To: <20241119153502.41361-1-vschneid@redhat.com> References: <20241119153502.41361-1-vschneid@redhat.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 373F9120013 X-Stat-Signature: 41yyh3xuqirp7t7thqd4gdb5qa8rouju X-Rspam-User: X-HE-Tag: 1732034662-219654 X-HE-Meta: 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 aT7LQ+Eu IU2sgD6DYh8f4tLVqDwX0rxrlBWScWlI6uwiePu7qsThCUzXcvmZwqlmjz7LyskPfsRBLSkjU+rSdqYZDBrkDW7evK1NFAuAswCCLb7DDIslzHKOhHnyX9Kde9VA/oF8Ny64OHKJ5HBxyp6fYnrZz7YWEm7odn3mlXA5ZQXr3qAG8LBQ2Bpnl6NkYGrvqURtlhTKNLxs5yw2hMfngXSC5fDQQwVqLHylUJagOSuMDl3hXp1VppnULkvPukHPb4Na/Cw8VTtHV5O/5JcYaW2ZUGtbYDs8pWGpL1EIY1qpoL6hxWxcO44Whxl7iJhHYtoWixH3PhCab/YR6lin836bgASkWwTBIWUTvivqe3ZS6GR3eBWM7tPLUVQXzv4tnSHY2SGNT2EmF/GNWb+Q= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 19 Nov 2024 16:34:47 +0100 Valentin Schneider wrote: > Context > ======= > > We've observed within Red Hat that isolated, NOHZ_FULL CPUs running a > pure-userspace application get regularly interrupted by IPIs sent from > housekeeping CPUs. Those IPIs are caused by activity on the housekeeping CPUs > leading to various on_each_cpu() calls, e.g.: FYI, Sending a patch series at the start of the merge window is likely going to get ignored. Care to resend after rc1 is released? Or at least ping about it. -- Steve