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 5ADF1C433FE for ; Fri, 21 Oct 2022 06:39:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CD83C8E0002; Fri, 21 Oct 2022 02:39:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C88848E0001; Fri, 21 Oct 2022 02:39:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B4FF48E0002; Fri, 21 Oct 2022 02:39:48 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id A490B8E0001 for ; Fri, 21 Oct 2022 02:39:48 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 7DD48140112 for ; Fri, 21 Oct 2022 06:39:48 +0000 (UTC) X-FDA: 80044006056.14.10BAD6B Received: from mail-lj1-f177.google.com (mail-lj1-f177.google.com [209.85.208.177]) by imf21.hostedemail.com (Postfix) with ESMTP id E29171C002A for ; Fri, 21 Oct 2022 06:39:47 +0000 (UTC) Received: by mail-lj1-f177.google.com with SMTP id bs14so2390834ljb.9 for ; Thu, 20 Oct 2022 23:39:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=FFzVqav4ytL2f0CsiBF+eInTfMA8Iy0X1Q8WlCib4/Q=; b=EeuUWgJRyRVkPZSaJYbew7R1hyU+bTUqCMY7+N+xsileGZvgqQhRjJwIFKuO7HmDrb bQHMgelR1wfFrvqjoMmlaGOLdTRP9gMDOWOXbUg2AJYoFDXMNqi+SKBmAq6zGoeREQNz Y4WFohrE7QxGDnjHl2VqAyMJ/gTHDLhC8MhuyDd/nj+RAjS1ZAG1gml6XdBRPTdSkVCs 2/N+X0Qyxim7k5rXj4vRb9R1jRMgCaOPyyLGjC39SUnku+JYkTaArB0q2xT0LPxg7B7v +G7VV7ut0/i2IDbQF6qohLPQelmq4jhw2U846FOs07YLHodWw5gXtquQeY3o0P1/5jwm LSEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:references:in-reply-to :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=FFzVqav4ytL2f0CsiBF+eInTfMA8Iy0X1Q8WlCib4/Q=; b=xLdT/IgL58krkcn816U0EwcG6BrHmRUa5vL3nApocNwjo53W9/l1JdO83oP2h/gYxB duC7db2VoJh1TmmmuJWk4bo0ytwKxzHyDtXQ95HjUIGE8Z8lGo89zZFDvBvrqtoSpdEe rU0e8BQRK9P4hQXcZ1bClqANVLZIevlWl/Wuzqg1BR8L9VD9fRHkhyZPnJ0qmFj9mmNL E8g18XUjL21CcbMW80LfbBc3U91QupwyEsXXK0aWlvZKtlzzWuTnjPyFpLFnNqAjq1Nl d+pp1EGpXDLPHCECKiUcmQD08Cl3YqjkT34J4BdQhIEqW59GS5adqymZmFkcylLiZUh/ Gsug== X-Gm-Message-State: ACrzQf0pbdcj8+WcQ14fg/2QrtsIjBtVpXq03gLwPf6be0VFphUmxbvL OV4DzEjCaFhML0qUnvrvmvGxYO5iezZVBEMWd30= X-Google-Smtp-Source: AMsMyM4sbtX82B5mKKEHXGcxQPQfO0Xlq0H1c39lDL8xvOXWXw5Gb+e0I9Rx/xGyhKm+X9hJsrod4+dymJAVsZtidxk= X-Received: by 2002:a2e:9652:0:b0:276:34ad:75c0 with SMTP id z18-20020a2e9652000000b0027634ad75c0mr398362ljh.59.1666334386089; Thu, 20 Oct 2022 23:39:46 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:ab3:5411:0:b0:1f6:575a:5fb7 with HTTP; Thu, 20 Oct 2022 23:39:44 -0700 (PDT) In-Reply-To: References: <20220915150417.722975-19-glider@google.com> <20221019173620.10167-1-youling257@gmail.com> From: youling 257 Date: Fri, 21 Oct 2022 14:39:44 +0800 Message-ID: Subject: Re: [PATCH v7 18/43] instrumented.h: add KMSAN support To: Marco Elver Cc: Alexander Potapenko , Alexander Viro , Alexei Starovoitov , Andrew Morton , Andrey Konovalov , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Christoph Hellwig , Christoph Lameter , David Rientjes , Dmitry Vyukov , Eric Biggers , Eric Dumazet , Greg Kroah-Hartman , Herbert Xu , Ilya Leoshkevich , Ingo Molnar , Jens Axboe , Joonsoo Kim , Kees Cook , Mark Rutland , Matthew Wilcox , "Michael S. Tsirkin" , Pekka Enberg , Peter Zijlstra , Petr Mladek , Stephen Rothwell , Steven Rostedt , Thomas Gleixner , Vasily Gorbik , Vegard Nossum , Vlastimil Babka , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1666334388; a=rsa-sha256; cv=none; b=ltP3RNY+ZOj+VkXtP3TekEs1QIYCnf6HFr7yl072tnLfWLZmXKam9dVi0km9fybNxlegHK lhWvb1h0dO+z3bKTgpI0tsfD1v+uZQa05vfZq3zwyqxwKBa+lm7Xg+Ck/s1agZmve04mY3 6wfcd+2bZH9FTxzN9GjGSOZwLniXJPw= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=EeuUWgJR; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf21.hostedemail.com: domain of youling257@gmail.com designates 209.85.208.177 as permitted sender) smtp.mailfrom=youling257@gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666334388; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=FFzVqav4ytL2f0CsiBF+eInTfMA8Iy0X1Q8WlCib4/Q=; b=cuniWzLWajLtYR3SaD1LyK917En5awvStgurhx2KUOqf2JYRXSCGAGziuIAEsYqJYnd/Vc 2R5PNZd4TIqZ5ZjbEWZ3+0EYOmoPBGl4rnNqgciAdstjfFJNkvMIAzVq0PrLAZhwCfHEQh P0dyaRpsmn+UX1nPHISP4MbeZl3CYh0= X-Rspamd-Queue-Id: E29171C002A Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=EeuUWgJR; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf21.hostedemail.com: domain of youling257@gmail.com designates 209.85.208.177 as permitted sender) smtp.mailfrom=youling257@gmail.com X-Rspam-User: X-Rspamd-Server: rspam08 X-Stat-Signature: xboqacpq33wu6bewbjxqxbndo8sh6cci X-HE-Tag: 1666334387-251052 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: PerfTop: 8253 irqs/sec kernel:75.3% exact: 100.0% lost: 0/0 drop: 0/17899 [4000Hz cycles], (all, 8 CPUs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 14.87% [kernel] [k] 0xffffffff941d1f37 6.71% [kernel] [k] 0xffffffff942016cf what is 0xffffffff941d1f37? 2022-10-21 14:16 GMT+08:00, Marco Elver : > On Thu, 20 Oct 2022 at 22:55, youling 257 wrote: >> >> How to use perf tool? > > The simplest would be to try just "perf top" - and see which kernel > functions consume most CPU cycles. I would suggest you compare both > kernels, and see if you can spot a function which uses more cycles% in > the problematic kernel. >