From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752312AbbIOHEL (ORCPT ); Tue, 15 Sep 2015 03:04:11 -0400 Received: from terminus.zytor.com ([198.137.202.10]:50188 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751292AbbIOHEJ (ORCPT ); Tue, 15 Sep 2015 03:04:09 -0400 Date: Tue, 15 Sep 2015 00:03:51 -0700 From: tip-bot for Arnaldo Carvalho de Melo Message-ID: Cc: linux-kernel@vger.kernel.org, kan.liang@intel.com, acme@redhat.com, tglx@linutronix.de, adrian.hunter@intel.com, dsahern@gmail.com, wangnan0@huawei.com, bp@suse.de, jolsa@redhat.com, namhyung@kernel.org, hpa@zytor.com, mingo@kernel.org, fweisbec@gmail.com, eranian@google.com Reply-To: wangnan0@huawei.com, dsahern@gmail.com, adrian.hunter@intel.com, tglx@linutronix.de, acme@redhat.com, kan.liang@intel.com, linux-kernel@vger.kernel.org, eranian@google.com, fweisbec@gmail.com, mingo@kernel.org, hpa@zytor.com, namhyung@kernel.org, jolsa@redhat.com, bp@suse.de To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] tools lib api cpu: Introduce cpu.[ch] to obtain cpu related information Git-Commit-ID: 09f6acf2eacad3a0f9a4b9f77e0b021f0cb45780 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 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 09f6acf2eacad3a0f9a4b9f77e0b021f0cb45780 Gitweb: http://git.kernel.org/tip/09f6acf2eacad3a0f9a4b9f77e0b021f0cb45780 Author: Arnaldo Carvalho de Melo AuthorDate: Thu, 10 Sep 2015 12:20:14 -0300 Committer: Arnaldo Carvalho de Melo CommitDate: Mon, 14 Sep 2015 12:50:26 -0300 tools lib api cpu: Introduce cpu.[ch] to obtain cpu related information E.g.: $ ./cpu__get_max_freq 3200000 It does that, as Kan's patch does, by looking at these files: $ cat /sys/devices/system/cpu/online 0-3 $ ./sysfs__read_ull devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq=3200000 $ I.e. find out the first online CPU, then read its cpufreq info. But do it in tools/lib/api/, so that other tools/ living code can use it, not just perf. Based-on-a-patch-by: Kan Liang Cc: Adrian Hunter Cc: Borislav Petkov Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Cc: Stephane Eranian Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-915v4cvxqplaub8qco66b9mv@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/api/Build | 1 + tools/lib/api/cpu.c | 18 ++++++++++++++++++ tools/lib/api/cpu.h | 6 ++++++ 3 files changed, 25 insertions(+) diff --git a/tools/lib/api/Build b/tools/lib/api/Build index 3653965..e8b8a23 100644 --- a/tools/lib/api/Build +++ b/tools/lib/api/Build @@ -1,2 +1,3 @@ libapi-y += fd/ libapi-y += fs/ +libapi-y += cpu.o diff --git a/tools/lib/api/cpu.c b/tools/lib/api/cpu.c new file mode 100644 index 0000000..8c64893 --- /dev/null +++ b/tools/lib/api/cpu.c @@ -0,0 +1,18 @@ +#include + +#include "cpu.h" +#include "fs/fs.h" + +int cpu__get_max_freq(unsigned long long *freq) +{ + char entry[PATH_MAX]; + int cpu; + + if (sysfs__read_int("devices/system/cpu/online", &cpu) < 0) + return -1; + + snprintf(entry, sizeof(entry), + "devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", cpu); + + return sysfs__read_ull(entry, freq); +} diff --git a/tools/lib/api/cpu.h b/tools/lib/api/cpu.h new file mode 100644 index 0000000..81e9d39 --- /dev/null +++ b/tools/lib/api/cpu.h @@ -0,0 +1,6 @@ +#ifndef __API_CPU__ +#define __API_CPU__ + +int cpu__get_max_freq(unsigned long long *freq); + +#endif /* __API_CPU__ */