From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755736Ab0EJJ1x (ORCPT ); Mon, 10 May 2010 05:27:53 -0400 Received: from mga11.intel.com ([192.55.52.93]:43471 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753195Ab0EJJ1w (ORCPT ); Mon, 10 May 2010 05:27:52 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.52,361,1270450800"; d="scan'208";a="796952168" Subject: [RFC][PATCH 3/9] perf: export registerred pmus via sysfs From: Lin Ming To: Peter Zijlstra , Ingo Molnar Cc: Frederic Weisbecker , "eranian@gmail.com" , "Gary.Mohr@Bull.com" , Corey Ashford , "arjan@linux.intel.com" , "Zhang, Yanmin" , Paul Mackerras , "David S. Miller" , Russell King , Paul Mundt , lkml Content-Type: text/plain Date: Mon, 10 May 2010 17:27:03 +0800 Message-Id: <1273483623.15998.57.camel@minggr.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1 (2.24.1-2.fc10) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Export pmus via sysfs /sys/devices/system/cpu/pmus/0...N The file name is the pmu id, ie, /sys/devices/system/cpu/pmus/N represents pmu id N. So perf tool can use it to initialize perf_event_attr. Signed-off-by: Lin Ming --- kernel/perf_event.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 46 insertions(+), 0 deletions(-) diff --git a/kernel/perf_event.c b/kernel/perf_event.c index f19d40e..003b632 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -5744,6 +5744,52 @@ static int __init perf_event_sysfs_init(void) } device_initcall(perf_event_sysfs_init); +#define PMU_ID_LEN 5 +static int __init perf_pmu_sysfs_init(void) +{ + struct kobject *pmu_kobj; + struct pmu *pmu; + struct bin_attribute *bin_attr; + char *pmu_id; + int err; + int i = 0; + + pmu_kobj = kobject_create_and_add("pmus", &cpu_sysdev_class.kset.kobj); + if (!pmu_kobj) { + printk(KERN_WARNING "%s: kset create error\n", __func__); + return -ENOMEM; + } + + list_for_each_entry(pmu, &pmus, entry) { + bin_attr = kzalloc(sizeof(*bin_attr), GFP_KERNEL); + pmu_id = kzalloc(PMU_ID_LEN, GFP_KERNEL); + + if (!bin_attr || !pmu_id) { + if (bin_attr) + kfree(bin_attr); + if (pmu_id) + kfree(pmu_id); + return -ENOMEM; + } + + sysfs_attr_init(&bin_attr.attr); + sprintf(pmu_id, "%d\n", i++); + bin_attr->size = 0; + bin_attr->attr.name = pmu_id; + bin_attr->attr.mode = 0444; + + err = sysfs_create_bin_file(pmu_kobj, bin_attr); + if (err) { + kfree(bin_attr); + kfree(pmu_id); + return -ENOMEM; + } + } + + return 0; +} +device_initcall(perf_pmu_sysfs_init); + void perf_event_register_pmu(struct pmu *pmu) { pmu->id = pmu_id_curr++;