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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B62B5EB64D7 for ; Tue, 20 Jun 2023 15:57:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233000AbjFTP5V (ORCPT ); Tue, 20 Jun 2023 11:57:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42504 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232729AbjFTP5K (ORCPT ); Tue, 20 Jun 2023 11:57:10 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2BA6B7; Tue, 20 Jun 2023 08:57:08 -0700 (PDT) Received: from kwepemm600003.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4Qlrln3fy1zMpHZ; Tue, 20 Jun 2023 23:53:57 +0800 (CST) Received: from localhost.localdomain (10.67.174.95) by kwepemm600003.china.huawei.com (7.193.23.202) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Tue, 20 Jun 2023 23:57:04 +0800 From: Yang Jihong To: , , , , , , , , , , CC: Subject: [PATCH 0/2] perf/core: deliver PERF_RECORD_COMM and PERF_RECORD_MMAP side-band events to all online cpus Date: Tue, 20 Jun 2023 15:55:13 +0000 Message-ID: <20230620155515.101222-1-yangjihong1@huawei.com> X-Mailer: git-send-email 2.30.GIT MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.67.174.95] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemm600003.china.huawei.com (7.193.23.202) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tasks are migrated between cores due to scheduling. If perf samples specified CPUs, PERF_RECORD_COMM and PERF_RECORD_MMAP events need be deliver to all cores to avoids the problem that the comm and symbols cannot be parsed due to task migration to the target core. The specific scenarios are as follows: CPU0 CPU1 perf record -C 0 start taskA starts to be created and executed -> PERF_RECORD_COMM and PERF_RECORD_MMAP events only deliver to CPU1 ...... | migrate to CPU0 | Running on CPU0 <----------/ ... perf record -C 0 stop Now perf samples the PC of taskA. However, perf does not record the PERF_RECORD_COMM and PERF_RECORD_COMM events of taskA. Therefore, the comm and symbols of taskA cannot be parsed. Yang Jihong (2): perf/core: perf_iterate_sb_cpu() supports to receive side-band events for all oneline cpus perf/core: deliver PERF_RECORD_COMM and PERF_RECORD_MMAP side-band events to all online cpus kernel/events/core.c | 58 +++++++++++++++++++++++++++++++------------- 1 file changed, 41 insertions(+), 17 deletions(-) -- 2.30.GIT