From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751647AbdGZMC2 (ORCPT ); Wed, 26 Jul 2017 08:02:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33570 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751610AbdGZMC0 (ORCPT ); Wed, 26 Jul 2017 08:02:26 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 6B0FA883D8 Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: ext-mx02.extmail.prod.ext.phx2.redhat.com; spf=none smtp.mailfrom=jolsa@kernel.org DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 6B0FA883D8 From: Jiri Olsa To: Arnaldo Carvalho de Melo Cc: lkml , Ingo Molnar , Peter Zijlstra , Alexander Shishkin , Namhyung Kim , David Ahern , Andi Kleen Subject: [PATCH 1/3] perf tools: Add perf_evsel__read_size function Date: Wed, 26 Jul 2017 14:02:04 +0200 Message-Id: <20170726120206.9099-2-jolsa@kernel.org> In-Reply-To: <20170726120206.9099-1-jolsa@kernel.org> References: <20170726120206.9099-1-jolsa@kernel.org> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Wed, 26 Jul 2017 12:02:25 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently we use the size of struct perf_counts_values to read the event, which prevents us to put any new member to the struct. Adding perf_evsel__read_size to return size of the buffer needed for event read. Link: http://lkml.kernel.org/n/tip-cfc3dmil3tlzezzxtyi9f38m@git.kernel.org Signed-off-by: Jiri Olsa --- tools/perf/util/evsel.c | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 450b5fadf8cb..4dd0fcc06db9 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1261,15 +1261,42 @@ void perf_counts_values__scale(struct perf_counts_values *count, *pscaled = scaled; } +static int perf_evsel__read_size(struct perf_evsel *evsel) +{ + u64 read_format = evsel->attr.read_format; + int entry = sizeof(u64); /* value */ + int size = 0; + int nr = 1; + + if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) + size += sizeof(u64); + + if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) + size += sizeof(u64); + + if (read_format & PERF_FORMAT_ID) + entry += sizeof(u64); + + if (read_format & PERF_FORMAT_GROUP) { + nr = evsel->nr_members; + size += sizeof(u64); + } + + size += entry * nr; + return size; +} + int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread, struct perf_counts_values *count) { + size_t size = perf_evsel__read_size(evsel); + memset(count, 0, sizeof(*count)); if (FD(evsel, cpu, thread) < 0) return -EINVAL; - if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) <= 0) + if (readn(FD(evsel, cpu, thread), count->values, size) <= 0) return -errno; return 0; -- 2.9.4