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 75727C433FE for ; Fri, 21 Oct 2022 15:19:31 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C178F8E0002; Fri, 21 Oct 2022 11:19:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BC7B58E0001; Fri, 21 Oct 2022 11:19:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A68358E0002; Fri, 21 Oct 2022 11:19:30 -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 924918E0001 for ; Fri, 21 Oct 2022 11:19:30 -0400 (EDT) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 6441F160909 for ; Fri, 21 Oct 2022 15:19:30 +0000 (UTC) X-FDA: 80045315700.11.E04F963 Received: from mail-lf1-f53.google.com (mail-lf1-f53.google.com [209.85.167.53]) by imf13.hostedemail.com (Postfix) with ESMTP id B089320044 for ; Fri, 21 Oct 2022 15:19:28 +0000 (UTC) Received: by mail-lf1-f53.google.com with SMTP id f37so5642246lfv.8 for ; Fri, 21 Oct 2022 08:19:28 -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=nLPDviM40EFa/Qu4CMFk6R9DVn/gn4Pe+x/zBYpv/KU=; b=XhEIMtohA6qebiZAOtvEzdbblBUp4RmVtoikpz0bOemQeKrz0hx6m5VW+QD50hW3h0 2RjU721QaaqALbbUVPsNBdm5kJsuy33gZ1Fiyegf207NHPa3Km3EuydthPTsiTlxTlsV ttaj4LAfz+EEBtV0n5Ww6F/Ddgj0t6OilnUkR81XaimlbW5yfwKdFBeL870iMKzwNFwu EBDv+8HkoEW5pYtcWRSQMoRg84NPkjxDzsABW0MxlZJZBcU0pYgMogFmyJJsm54tDjeC j209GxYlVoKNiLpIA6jJThvQ5HmQjnRYcPennaza+uId3mgauL88T4TuWEMJ4sLx9EcM jQpQ== 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=nLPDviM40EFa/Qu4CMFk6R9DVn/gn4Pe+x/zBYpv/KU=; b=knqjU/xTH4oel0XN3Da0Wi+oWo67wTb3oUc2t6qFkqWT20aiJ49sNK5rAyvfd2lbhr jP4cCuU78N4SC71u3jII0wORjJkv0wM//W1qSHPgDb2dpOniRRIYf5ifsU2dLk0WkRct 934uiqycJgFqmxyh9Av3LFNBKyESJ+z9ZxE+K2Woo6dy4Yaum+j1J74ky0VzYQc2QhKY rOrpstncwDqEeCyed6E0IZzG9vzFr/RFB2wQhMBr92Ztx4dqKTNiVmbqFIqXU5lP+G/h 5CU9T1sYOs+dhnYAx26/4qfv5GkYYRvOHTTp4Kd+OrVwg6kZ3MNTv5/3b5yvloFmfOLU S4fQ== X-Gm-Message-State: ACrzQf2zE25efVU11H9dDIcTKhyeZmsX1uNvgbM1m8BK+9KH/yvlgPIK Q4cQYUz6ll7Um8JYd4dt8b4fY6lnsKak2iFXJ4c= X-Google-Smtp-Source: AMsMyM512XVtiUKIJWXuDsQvik0/Z3SsK9ULwn0I2JQT+zvcMZWojkirDhRouC7SL5La3bSLv7lS2lxj1KygSodjF80= X-Received: by 2002:a05:6512:4002:b0:4a2:6243:8384 with SMTP id br2-20020a056512400200b004a262438384mr6716302lfb.29.1666365566622; Fri, 21 Oct 2022 08:19:26 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:ab3:5411:0:b0:1f6:575a:5fb7 with HTTP; Fri, 21 Oct 2022 08:19:25 -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 23:19:25 +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-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666365568; 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=nLPDviM40EFa/Qu4CMFk6R9DVn/gn4Pe+x/zBYpv/KU=; b=UG0m7HTIiTCGMQ/Cx4pz/TNTrBydt+Hj0ONQ1LHYDEBfJXuRryr+G0y+aAam5UT9J01HYY FGZX39DNebn1zrdA6Eld1GJndVnSvtHjF+uvux5cY3lu7cV9u4OMT5Sn0U0D0WlR9tXhzi /SAyYEvwMEK3TN2Z50voSnXAuyW8DSw= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=XhEIMtoh; spf=pass (imf13.hostedemail.com: domain of youling257@gmail.com designates 209.85.167.53 as permitted sender) smtp.mailfrom=youling257@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1666365568; a=rsa-sha256; cv=none; b=lNSQPjsYKuRbKn8HQoX5H8D1s07/1R7FBZFS/q+pqi6WMcLEcRkmevpea2m4TubJX+IgrV mhMIUMF2agj1sUvJuHBiLTn4jOqeapyMpCC7xgyMDToidnQ5PANpTUnl2s8EaKadQljnuv o9/RgfO52tKNlA0UG5+RsqiYN07sbKs= X-Stat-Signature: x76okf13aw8uqbk5z4xuae1zsg5u9577 X-Rspam-User: Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=XhEIMtoh; spf=pass (imf13.hostedemail.com: domain of youling257@gmail.com designates 209.85.167.53 as permitted sender) smtp.mailfrom=youling257@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: B089320044 X-HE-Tag: 1666365568-222921 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: CONFIG_DEBUG_INFO=y CONFIG_AS_HAS_NON_CONST_LEB128=y # CONFIG_DEBUG_INFO_NONE is not set CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y # CONFIG_DEBUG_INFO_DWARF4 is not set # CONFIG_DEBUG_INFO_DWARF5 is not set # CONFIG_DEBUG_INFO_REDUCED is not set # CONFIG_DEBUG_INFO_COMPRESSED is not set # CONFIG_DEBUG_INFO_SPLIT is not set # CONFIG_DEBUG_INFO_BTF is not set # CONFIG_GDB_SCRIPTS is not set perf top still no function name. 12.90% [kernel] [k] 0xffffffff833dfa64 3.78% [kernel] [k] 0xffffffff8285b439 3.61% [kernel] [k] 0xffffffff83370254 2.32% [kernel] [k] 0xffffffff8337025b 1.88% bluetooth.default.so [.] 0x000000000000d09d 2022-10-21 15:37 GMT+08:00, Marco Elver : > On Thu, 20 Oct 2022 at 23:39, youling 257 wrote: >> >> 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? > > You need to build with debug symbols: > CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y > > Then it'll show function names. > >> 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. >> > >