From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: Found unknown events Date: Mon, 04 Nov 2013 22:04:24 -0700 Message-ID: <52787C58.7030100@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pd0-f172.google.com ([209.85.192.172]:58920 "EHLO mail-pd0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750911Ab3KEFE0 (ORCPT ); Tue, 5 Nov 2013 00:04:26 -0500 Received: by mail-pd0-f172.google.com with SMTP id w10so7759634pde.31 for ; Mon, 04 Nov 2013 21:04:26 -0800 (PST) In-Reply-To: Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: wufei , linux-perf-users@vger.kernel.org On 11/4/13, 7:40 AM, wufei wrote: > Hello All, > > I am using perf to measure a multi-threaded program on kernel 3.2.23, > the system has 40 cores and there are lots of context switches during > the test. The command is: > # perf record -e sched:sched_stat_sleep -e sched:sched_switch -e > sched:sched_process_exit -g -r 0 -p 39249 sleep 5 > It generates a ~1GB size perf.data. `perf report` got 2 issues: > > 1. A lot of this warning message: > Warning: Timestamp below last timeslice flush What's the NUMA make up? multiple sockets? > > 2. No useful output, but this: > Found 32117 unknown events! Try increasing the mmap size. e.g., -m 2048. Does it decrease or remove this stat? David