Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751277AbaLQCWN (ORCPT ); Tue, 16 Dec 2014 21:22:13 -0500 Received: from szxga01-in.huawei.com ([119.145.14.64]:39268 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751027AbaLQCWM (ORCPT ); Tue, 16 Dec 2014 21:22:12 -0500 Message-ID: <5490E856.6050904@huawei.com> Date: Wed, 17 Dec 2014 10:20:06 +0800 From: Zefan Li User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Vince Weaver CC: , Arnaldo Carvalho de Melo , LKML , Ingo Molnar , "Peter Zijlstra" , Stephane Eranian , Tejun Heo Subject: Re: [perf tool] cgroup support broken on Debian? References: <20141215220150.GP9845@kernel.org> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.18.230] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2014/12/17 1:17, Vince Weaver wrote: > On Mon, 15 Dec 2014, Stephane Eranian wrote: >> On Mon, Dec 15, 2014 at 11:01 PM, Arnaldo Carvalho de Melo wrote: > >> fs is visible. The cgroup file system type is not there anymore. They are using >> tmpfs which is not ideal to detect just cgroup. Looks like now, we have to look >> at the mount point which is flaky. > > The trivial fix is to just always assume things will be under > /sys/fs/cgroup > which looks like to be the new official mount point. > > This will break on older systems though, or systems that mount cgroupfs in > multiple locations. > > Another alternative is to change the interface to require the full > cgroupfs pathname as an argument to -G > What's the problem here? none /sys/fs/cgroup tmpfs rw,relatime,size=4k,mode=755 0 0 systemd /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,perf_event,name=systemd 0 0 cgroup is mounted in /sys/fs/cgroup/systemd, so you should pass '/' to the -G argument: sudo perf stat -a -e cycles:u,cycles:u,cycles:u -G / -- sleep 1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/