From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: Issue perf attaching to processes creating many short-live threads Date: Fri, 23 Oct 2015 12:56:53 -0600 Message-ID: <562A82F5.8090306@gmail.com> References: <562A81ED.70900@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pa0-f41.google.com ([209.85.220.41]:33194 "EHLO mail-pa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751358AbbJWS44 (ORCPT ); Fri, 23 Oct 2015 14:56:56 -0400 Received: by pabrc13 with SMTP id rc13so125063049pab.0 for ; Fri, 23 Oct 2015 11:56:55 -0700 (PDT) In-Reply-To: <562A81ED.70900@redhat.com> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: William Cohen , "linux-perf-use." Cc: =?UTF-8?B?5aSn5bmz5oCc?= On 10/23/15 12:52 PM, William Cohen wrote: > Earlier this month Rei Odeira found that the oprofile tool operf would > have problems attaching and monitoring a process that created many > very short-lived threads. It looks like the kernel's perf tool also > has issues when attempting to attach and monitor a process that is > creating many short-lived threads. known a problem. If this is the problem I think it is you will find that strace shows perf stuck walking /proc directory. David