From patchwork Mon Mar 1 19:04:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sai Prakash Ranjan X-Patchwork-Id: 388819 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2DB13C433DB for ; Mon, 1 Mar 2021 19:11:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE8CA64DEE for ; Mon, 1 Mar 2021 19:11:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240869AbhCATLS (ORCPT ); Mon, 1 Mar 2021 14:11:18 -0500 Received: from z11.mailgun.us ([104.130.96.11]:59106 "EHLO z11.mailgun.us" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240915AbhCATGD (ORCPT ); Mon, 1 Mar 2021 14:06:03 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1614625547; h=Content-Transfer-Encoding: MIME-Version: References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=KSTg/iMAFnE3tGluW86ejokWeue2G0X6gpc2LUi/L5o=; b=d9SBYUp+fMuIEQcjU/ar7ekuMZMD8505NolesDKC1X8jhTnUjNcHnnDzu8o3wR8D4JZ+VW8+ kgA4UIRulvMltd3ZCNU3O5Qzhnqby3ypkh+NKfeRsd26ZkGLiaUm5JJPnVkbDo6ipI3IRtp/ HGTiTyL3sszb6gGSiyt6GtSnMYY= X-Mailgun-Sending-Ip: 104.130.96.11 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n03.prod.us-west-2.postgun.com with SMTP id 603d3ae19d2570c9fef61f9f (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Mon, 01 Mar 2021 19:05:05 GMT Sender: saiprakash.ranjan=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 7B4E2C433ED; Mon, 1 Mar 2021 19:05:05 +0000 (UTC) Received: from blr-ubuntu-253.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: saiprakash.ranjan) by smtp.codeaurora.org (Postfix) with ESMTPSA id CB947C433C6; Mon, 1 Mar 2021 19:04:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org CB947C433C6 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=saiprakash.ranjan@codeaurora.org From: Sai Prakash Ranjan To: Mathieu Poirier , Suzuki K Poulose , Mike Leach , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Leo Yan Cc: Jiri Olsa , Namhyung Kim , coresight@lists.linaro.org, Stephen Boyd , Denis Nikitin , Mattias Nissler , Al Grant , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Douglas Anderson , Sai Prakash Ranjan Subject: [PATCHv2 2/4] perf evsel: Print warning for excluding kernel mode instruction tracing Date: Tue, 2 Mar 2021 00:34:16 +0530 Message-Id: <523a5af43615b804aa1211a3f27e06226d7159bc.1614624041.git.saiprakash.ranjan@codeaurora.org> X-Mailer: git-send-email 2.29.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add a warning message to check CONFIG_EXCLUDE_KERNEL_HW_ITRACE kernel config which excludes kernel mode instruction tracing to help perf tool users identify the perf event open failure when they attempt kernel mode tracing with this config enabled. Tested-by: Denis Nikitin Signed-off-by: Sai Prakash Ranjan Reviewed-by: Douglas Anderson --- tools/perf/util/evsel.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 1bf76864c4f2..3f584128a590 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -2672,7 +2672,8 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target, ">= 1: Disallow CPU event access\n" ">= 2: Disallow kernel profiling\n" "To make the adjusted perf_event_paranoid setting permanent preserve it\n" - "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = )", + "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = )\n\n" + "Also check CONFIG_EXCLUDE_KERNEL_PMU_TRACE if kernel mode tracing is allowed.", perf_event_paranoid()); case ENOENT: return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));