From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Steets Subject: Re: perf: prctl(PR_TASK_PERF_EVENTS_DISABLE) has no effect Date: Fri, 27 Jan 2012 14:06:48 -0600 Message-ID: <4F2303D8.80300@rgmadvisors.com> References: <4F22D8D9.3010108@rgmadvisors.com> <1327684363.2446.176.camel@twins> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Return-path: Received: from na3sys009aog109.obsmtp.com ([74.125.149.201]:36753 "EHLO na3sys009aog109.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752034Ab2A0UG5 (ORCPT ); Fri, 27 Jan 2012 15:06:57 -0500 Received: by mail-yx0-f176.google.com with SMTP id l9so1098064yen.21 for ; Fri, 27 Jan 2012 12:06:50 -0800 (PST) In-Reply-To: <1327684363.2446.176.camel@twins> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Peter Zijlstra Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo On 1/27/12 11:12 AM, Peter Zijlstra wrote: > On Fri, 2012-01-27 at 11:03 -0600, Andrew Steets wrote: >> Can anyone tell >> me if I'm using this wrong or if this is a bug? > > You're using it wrong, it will disable events you own (created) not > events that monitor you. Is there an alternate way of disabling events that monitor the current process? I ask because I came across the following description in tools/perf/design.txt: A process can enable or disable all the counter groups that are attached to it, using prctl: prctl(PR_TASK_PERF_EVENTS_ENABLE); prctl(PR_TASK_PERF_EVENTS_DISABLE); This applies to all counters on the current process, whether created by this process or by another, and doesn't affect any counters that this process has created on other processes. It only enables or disables the group leaders, not any other members in the groups. -Andrew -- --------------------------------------------------------------- This email, along with any attachments, is confidential. If you believe you received this message in error, please contact the sender immediately and delete all copies of the message. Thank you.