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 X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 19E29CA9EAF for ; Thu, 24 Oct 2019 19:02:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E3E6A21D7B for ; Thu, 24 Oct 2019 19:02:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ZDhWZ5D7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2504308AbfJXTCZ (ORCPT ); Thu, 24 Oct 2019 15:02:25 -0400 Received: from mail-yw1-f73.google.com ([209.85.161.73]:35042 "EHLO mail-yw1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2504298AbfJXTCX (ORCPT ); Thu, 24 Oct 2019 15:02:23 -0400 Received: by mail-yw1-f73.google.com with SMTP id t2so15228092ywd.2 for ; Thu, 24 Oct 2019 12:02:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=98x/ZBLRTnMz91JDf+r9eCkgM4R/aoJz7oABA29poQw=; b=ZDhWZ5D7Wad+xuhdcDWVOwjHsUewHijXR4y/lysN14gT4QR+/zxGLfhiRxlGwAByFJ wvV2FnISzVdGITQXf0PO2HsO/HkwjZV7v2BE0VRLy04+b4hbSO4FKoY7WN4sz/JBP1ZV o3uEIPfSt625AEJBsANTLrgdPcGYLg6rMD08yGPhw2CvVkaj5YJyGZa4ERxFIT7hZQQx HeODyGP/Z5W+sz6bzgLTdAN+HCfRn7izfeYB2gAdWXzraeS/rDA+lGdfOdKktC7MJl0b YSufsmH3+5ztriU/uDRYbI53ZDXG2wUof1NI+EYLa+Zt3raRx1eQYkWBjgz3t8EjKwgQ YxqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=98x/ZBLRTnMz91JDf+r9eCkgM4R/aoJz7oABA29poQw=; b=G2ueu7eofBOm1piZDNZDOtFqF9FpMaOlh0xX7xEGEqR6zjSxh6cBvIoP4Cv1VT73AV cyBofloXtW5ZhNVFW1cW7iv5tAJPgSml7nD1mf2HMxugBOiybBohVxy3xdFDC+E1JAzs F0DTkN8+H6brTGI4R+hX5UId35brW1qlV9u4V/gMbAUEbx0O7iQJqGy1tSH/uKrRcs3M i+DIdVUAmf6bP+Bb+6wdUwyHrRfSETweCv/ED23CaJ0di7BtywBJ6F09DTtQT8pcIv1U li+kMlpp062jCirDo514xCVbVhkVFotjFbuvJ1tfkyYXUS5r/Gd7Ja/irMSobjT9RGMZ m+sA== X-Gm-Message-State: APjAAAXBpY8q2mDtlC9XCnVXVwxlnMIy1QkvGXbaIYn6ltmWG7pv7S68 B7GUiTPB/aChhOXxBm7U2BkOrp++wcV3 X-Google-Smtp-Source: APXvYqy0z0w7HaNQVrFGbWenHVtVo7T0wRW7iIgngW02X25slgtdxq4MgrTgKqZ5Bo3fCcCgjigLNvemKmy6 X-Received: by 2002:a81:58d6:: with SMTP id m205mr8304346ywb.293.1571943740635; Thu, 24 Oct 2019 12:02:20 -0700 (PDT) Date: Thu, 24 Oct 2019 12:01:58 -0700 In-Reply-To: <20191024190202.109403-1-irogers@google.com> Message-Id: <20191024190202.109403-6-irogers@google.com> Mime-Version: 1.0 References: <20191023005337.196160-1-irogers@google.com> <20191024190202.109403-1-irogers@google.com> X-Mailer: git-send-email 2.23.0.866.gb869b98d4c-goog Subject: [PATCH v3 5/9] perf tools: avoid a malloc for array events From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , Andi Kleen , Jin Yao , Adrian Hunter , Kan Liang , John Garry , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, clang-built-linux@googlegroups.com Cc: Stephane Eranian , Ian Rogers Content-Type: text/plain; charset="UTF-8" Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Use realloc rather than malloc+memcpy to possibly avoid a memory allocation when appending array elements. Signed-off-by: Ian Rogers --- tools/perf/util/parse-events.y | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 26cb65798522..545ab7cefc20 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -691,14 +691,12 @@ array_terms ',' array_term struct parse_events_array new_array; new_array.nr_ranges = $1.nr_ranges + $3.nr_ranges; - new_array.ranges = malloc(sizeof(new_array.ranges[0]) * - new_array.nr_ranges); + new_array.ranges = realloc($1.ranges, + sizeof(new_array.ranges[0]) * + new_array.nr_ranges); ABORT_ON(!new_array.ranges); - memcpy(&new_array.ranges[0], $1.ranges, - $1.nr_ranges * sizeof(new_array.ranges[0])); memcpy(&new_array.ranges[$1.nr_ranges], $3.ranges, $3.nr_ranges * sizeof(new_array.ranges[0])); - free($1.ranges); free($3.ranges); $$ = new_array; } -- 2.23.0.866.gb869b98d4c-goog