From patchwork Thu Aug 20 09:19:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265858 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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 26D64C433E1 for ; Thu, 20 Aug 2020 09:29:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 012FF22B4B for ; Thu, 20 Aug 2020 09:29:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597915758; bh=5AckTXm0iPCXnCFpyigvpzwr1s+pozYsuJuIRPH0wgk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=b/S+bXKwZO7EeHYyZKWnjmgl5RM/C8lk7tTfzeM6gzZBAVoFvHOEvONQy8vHT5jO+ 6ViCYg1Bi/HUNcNapYyFXzsyv6KRN2M1jdrxj1ubF2CrjcKSIiqC6BfTi039zM2vcn G43ZkeIzOSRjJYjI0hCT49d8vzsEmHv/0WoOR2mQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727774AbgHTJ3L (ORCPT ); Thu, 20 Aug 2020 05:29:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:36868 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727068AbgHTJ22 (ORCPT ); Thu, 20 Aug 2020 05:28:28 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id ECE8D22CA1; Thu, 20 Aug 2020 09:28:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597915700; bh=5AckTXm0iPCXnCFpyigvpzwr1s+pozYsuJuIRPH0wgk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PzFp4m0VnHt2eJmb35obIL5K44CKIvE02P9hun4OoOQVvv8wwmyX+M7+4ALRM/dmw o1HUHqi7QwCQbbkPGFIf+E/n8BKghTnxySjj+F75BVVFnHtVcX1/FCQTFZ/qqkje4g 1CHvq94kdCA9p0GZSx/SNaTDFJ6Ailp5Ukb+dHFw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adrian Hunter , Andi Kleen , Arnaldo Carvalho de Melo , Jiri Olsa Subject: [PATCH 5.8 105/232] perf intel-pt: Fix duplicate branch after CBR Date: Thu, 20 Aug 2020 11:19:16 +0200 Message-Id: <20200820091617.908535739@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091612.692383444@linuxfoundation.org> References: <20200820091612.692383444@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Adrian Hunter commit a58a057ce65b52125dd355b7d8b0d540ea267a5f upstream. CBR events can result in a duplicate branch event, because the state type defaults to a branch. Fix by clearing the state type. Example: trace 'sleep' and hope for a frequency change Before: $ perf record -e intel_pt//u sleep 0.1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.034 MB perf.data ] $ perf script --itrace=bpe > before.txt After: $ perf script --itrace=bpe > after.txt $ diff -u before.txt after.txt # --- before.txt 2020-07-07 14:42:18.191508098 +0300 # +++ after.txt 2020-07-07 14:42:36.587891753 +0300 @@ -29673,7 +29673,6 @@ sleep 93431 [007] 15411.619905: 1 branches:u: 0 [unknown] ([unknown]) => 7f0818abb2e0 clock_nanosleep@@GLIBC_2.17+0x0 (/usr/lib/x86_64-linux-gnu/libc-2.31.so) sleep 93431 [007] 15411.619905: 1 branches:u: 7f0818abb30c clock_nanosleep@@GLIBC_2.17+0x2c (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 0 [unknown] ([unknown]) sleep 93431 [007] 15411.720069: cbr: cbr: 15 freq: 1507 MHz ( 56%) 7f0818abb30c clock_nanosleep@@GLIBC_2.17+0x2c (/usr/lib/x86_64-linux-gnu/libc-2.31.so) - sleep 93431 [007] 15411.720069: 1 branches:u: 7f0818abb30c clock_nanosleep@@GLIBC_2.17+0x2c (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 0 [unknown] ([unknown]) sleep 93431 [007] 15411.720076: 1 branches:u: 0 [unknown] ([unknown]) => 7f0818abb30e clock_nanosleep@@GLIBC_2.17+0x2e (/usr/lib/x86_64-linux-gnu/libc-2.31.so) sleep 93431 [007] 15411.720077: 1 branches:u: 7f0818abb323 clock_nanosleep@@GLIBC_2.17+0x43 (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 7f0818ac0eb7 __nanosleep+0x17 (/usr/lib/x86_64-linux-gnu/libc-2.31.so) sleep 93431 [007] 15411.720077: 1 branches:u: 7f0818ac0ebf __nanosleep+0x1f (/usr/lib/x86_64-linux-gnu/libc-2.31.so) => 55cb7e4c2827 rpl_nanosleep+0x97 (/usr/bin/sleep) Fixes: 91de8684f1cff ("perf intel-pt: Cater for CBR change in PSB+") Fixes: abe5a1d3e4bee ("perf intel-pt: Decoder to output CBR changes immediately") Signed-off-by: Adrian Hunter Reviewed-by: Andi Kleen Tested-by: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: stable@vger.kernel.org Link: http://lore.kernel.org/lkml/20200710151104.15137-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Greg Kroah-Hartman --- tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -1977,8 +1977,10 @@ next: * possibility of another CBR change that gets caught up * in the PSB+. */ - if (decoder->cbr != decoder->cbr_seen) + if (decoder->cbr != decoder->cbr_seen) { + decoder->state.type = 0; return 0; + } break; case INTEL_PT_PIP: @@ -2019,8 +2021,10 @@ next: case INTEL_PT_CBR: intel_pt_calc_cbr(decoder); - if (decoder->cbr != decoder->cbr_seen) + if (decoder->cbr != decoder->cbr_seen) { + decoder->state.type = 0; return 0; + } break; case INTEL_PT_MODE_EXEC: