From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932490Ab3KLV54 (ORCPT ); Tue, 12 Nov 2013 16:57:56 -0500 Received: from terminus.zytor.com ([198.137.202.10]:40268 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756787Ab3KLV51 (ORCPT ); Tue, 12 Nov 2013 16:57:27 -0500 Date: Tue, 12 Nov 2013 13:57:15 -0800 From: tip-bot for David Ahern Message-ID: Cc: acme@redhat.com, linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, dsahern@gmail.com, tglx@linutronix.de, jolsa@redhat.com Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, acme@redhat.com, dsahern@gmail.com, tglx@linutronix.de, jolsa@redhat.com In-Reply-To: <1384267617-3446-3-git-send-email-dsahern@gmail.com> References: <1384267617-3446-3-git-send-email-dsahern@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/urgent] perf evlist: Round mmap pages to power 2 - v2 Git-Commit-ID: 9639837e95db90d056f4683c911717921519320e X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.1 (terminus.zytor.com [127.0.0.1]); Tue, 12 Nov 2013 13:57:21 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 9639837e95db90d056f4683c911717921519320e Gitweb: http://git.kernel.org/tip/9639837e95db90d056f4683c911717921519320e Author: David Ahern AuthorDate: Tue, 12 Nov 2013 07:46:54 -0700 Committer: Arnaldo Carvalho de Melo CommitDate: Tue, 12 Nov 2013 16:31:53 -0300 perf evlist: Round mmap pages to power 2 - v2 Currently perf requires the -m / --mmap_pages option to be a power of 2. To be more user friendly perf should automatically round this up to the next power of 2. Currently: $ perf record -m 3 -a -- sleep 1 --mmap_pages/-m value must be a power of two.sleep: Terminated With patch: $ perf record -m 3 -a -- sleep 1 rounding mmap pages size to 16384 (4 pages) ... v2: Add bytes units to rounding message per Ingo's request. Other suggestions (e.g., prefixing INFO) should be addressed by wrapping pr_info to catch all instances. Suggested-by: Ingo Molnar Signed-off-by: David Ahern Cc: Ingo Molnar Cc: Jiri Olsa Link: http://lkml.kernel.org/r/1384267617-3446-3-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evlist.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 3960560..fb4727d 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -710,7 +710,6 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, { unsigned int *mmap_pages = opt->value; unsigned long pages, val; - size_t size; static struct parse_tag tags[] = { { .tag = 'B', .mult = 1 }, { .tag = 'K', .mult = 1 << 10 }, @@ -726,11 +725,6 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, if (val != (unsigned long) -1) { /* we got file size value */ pages = PERF_ALIGN(val, page_size) / page_size; - if (pages < (1UL << 31) && !is_power_of_2(pages)) { - pages = next_pow2(pages); - pr_info("rounding mmap pages size to %lu (%lu pages)\n", - pages * page_size, pages); - } } else { /* we got pages count value */ char *eptr; @@ -741,14 +735,14 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str, } } - if (pages > UINT_MAX || pages > SIZE_MAX / page_size) { - pr_err("--mmap_pages/-m value too big\n"); - return -1; + if (pages < (1UL << 31) && !is_power_of_2(pages)) { + pages = next_pow2(pages); + pr_info("rounding mmap pages size to %lu bytes (%lu pages)\n", + pages * page_size, pages); } - size = perf_evlist__mmap_size(pages); - if (!size) { - pr_err("--mmap_pages/-m value must be a power of two."); + if (pages > UINT_MAX || pages > SIZE_MAX / page_size) { + pr_err("--mmap_pages/-m value too big\n"); return -1; }