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=-11.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 D247FC433E2 for ; Fri, 17 Jul 2020 06:59:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B73E62071A for ; Fri, 17 Jul 2020 06:59:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728009AbgGQG7R (ORCPT ); Fri, 17 Jul 2020 02:59:17 -0400 Received: from mga05.intel.com ([192.55.52.43]:9062 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726426AbgGQG7R (ORCPT ); Fri, 17 Jul 2020 02:59:17 -0400 IronPort-SDR: A7IlkHLH33zEGOVSU90kNRjJd2T4UjmjYr/7Bv4R/OZb4k5UjlmyWFb5fiNySog3yo6uBos3Fi xg9UFAiDboPA== X-IronPort-AV: E=McAfee;i="6000,8403,9684"; a="234398719" X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="234398719" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jul 2020 23:59:16 -0700 IronPort-SDR: LXjEkZzjSWdCEohMwXBZny+7QYC/vz/DYcs3tVmMOm2M9j2roo2ro3yTb/t6rgao10EiISXbk9 wF3JobaPmZLA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="486378432" Received: from linux.intel.com ([10.54.29.200]) by fmsmga006.fm.intel.com with ESMTP; 16 Jul 2020 23:59:16 -0700 Received: from [10.249.224.34] (abudanko-mobl.ccr.corp.intel.com [10.249.224.34]) by linux.intel.com (Postfix) with ESMTP id 242AE580100; Thu, 16 Jul 2020 23:59:13 -0700 (PDT) Subject: [PATCH v12 01/15] tools/libperf: avoid internal moving of fdarray fds From: Alexey Budankov To: Arnaldo Carvalho de Melo Cc: Jiri Olsa , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Ingo Molnar , Andi Kleen , linux-kernel References: <8d91c3a0-3db4-0a7a-ae13-299adb444bd6@linux.intel.com> Organization: Intel Corp. Message-ID: <676844f8-55d3-c628-23db-aa163a81519e@linux.intel.com> Date: Fri, 17 Jul 2020 09:59:12 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <8d91c3a0-3db4-0a7a-ae13-299adb444bd6@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Avoid moving of fds by fdarray__filter() so fds indices returned by fdarray__add() can be used for access and processing of objects at struct pollfd *entries. Signed-off-by: Alexey Budankov Acked-by: Jiri Olsa Acked-by: Namhyung Kim --- tools/lib/api/fd/array.c | 11 +++++------ tools/perf/tests/fdarray.c | 20 ++------------------ 2 files changed, 7 insertions(+), 24 deletions(-) diff --git a/tools/lib/api/fd/array.c b/tools/lib/api/fd/array.c index 58d44d5eee31..89f9a2193c2d 100644 --- a/tools/lib/api/fd/array.c +++ b/tools/lib/api/fd/array.c @@ -93,22 +93,21 @@ int fdarray__filter(struct fdarray *fda, short revents, return 0; for (fd = 0; fd < fda->nr; ++fd) { + if (!fda->entries[fd].events) + continue; + if (fda->entries[fd].revents & revents) { if (entry_destructor) entry_destructor(fda, fd, arg); + fda->entries[fd].revents = fda->entries[fd].events = 0; continue; } - if (fd != nr) { - fda->entries[nr] = fda->entries[fd]; - fda->priv[nr] = fda->priv[fd]; - } - ++nr; } - return fda->nr = nr; + return nr; } int fdarray__poll(struct fdarray *fda, int timeout) diff --git a/tools/perf/tests/fdarray.c b/tools/perf/tests/fdarray.c index c7c81c4a5b2b..d0c8a05aab2f 100644 --- a/tools/perf/tests/fdarray.c +++ b/tools/perf/tests/fdarray.c @@ -12,6 +12,7 @@ static void fdarray__init_revents(struct fdarray *fda, short revents) for (fd = 0; fd < fda->nr; ++fd) { fda->entries[fd].fd = fda->nr - fd; + fda->entries[fd].events = revents; fda->entries[fd].revents = revents; } } @@ -29,7 +30,7 @@ static int fdarray__fprintf_prefix(struct fdarray *fda, const char *prefix, FILE int test__fdarray__filter(struct test *test __maybe_unused, int subtest __maybe_unused) { - int nr_fds, expected_fd[2], fd, err = TEST_FAIL; + int nr_fds, err = TEST_FAIL; struct fdarray *fda = fdarray__new(5, 5); if (fda == NULL) { @@ -55,7 +56,6 @@ int test__fdarray__filter(struct test *test __maybe_unused, int subtest __maybe_ fdarray__init_revents(fda, POLLHUP); fda->entries[2].revents = POLLIN; - expected_fd[0] = fda->entries[2].fd; pr_debug("\nfiltering all but fda->entries[2]:"); fdarray__fprintf_prefix(fda, "before", stderr); @@ -66,17 +66,9 @@ int test__fdarray__filter(struct test *test __maybe_unused, int subtest __maybe_ goto out_delete; } - if (fda->entries[0].fd != expected_fd[0]) { - pr_debug("\nfda->entries[0].fd=%d != %d\n", - fda->entries[0].fd, expected_fd[0]); - goto out_delete; - } - fdarray__init_revents(fda, POLLHUP); fda->entries[0].revents = POLLIN; - expected_fd[0] = fda->entries[0].fd; fda->entries[3].revents = POLLIN; - expected_fd[1] = fda->entries[3].fd; pr_debug("\nfiltering all but (fda->entries[0], fda->entries[3]):"); fdarray__fprintf_prefix(fda, "before", stderr); @@ -88,14 +80,6 @@ int test__fdarray__filter(struct test *test __maybe_unused, int subtest __maybe_ goto out_delete; } - for (fd = 0; fd < 2; ++fd) { - if (fda->entries[fd].fd != expected_fd[fd]) { - pr_debug("\nfda->entries[%d].fd=%d != %d\n", fd, - fda->entries[fd].fd, expected_fd[fd]); - goto out_delete; - } - } - pr_debug("\n"); err = 0; -- 2.24.1