Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757955Ab1CaOVp (ORCPT ); Thu, 31 Mar 2011 10:21:45 -0400 Received: from mail-yw0-f46.google.com ([209.85.213.46]:48548 "EHLO mail-yw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752952Ab1CaOVo (ORCPT ); Thu, 31 Mar 2011 10:21:44 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:content-transfer-encoding :in-reply-to:x-url:user-agent; b=ia40kCYvy6OkTcGxD4q/hRYtg00h0YS+fMtfkJdI8AT3QPBrJNq7bZh6uNrVQvVJSY ukDxvpP1LHjURg30MOzaf5pPYj+ha8T0AWcFpoFyv3qeOHtPIrWHDOM2d/daeaGR1ZAP 9wZswBKcU85dn9GGogtAhsR93vcOWL3e8BdT4= Date: Thu, 31 Mar 2011 11:21:35 -0300 From: Arnaldo Carvalho de Melo To: Dave Jones Cc: Linus Torvalds , Andrew Morton , Linux Kernel , Tejun Heo Subject: Re: excessive kworker activity when idle. (was Re: vma corruption in today's -git) Message-ID: <20110331142135.GB25095@ghostprotocols.net> References: <20110329040939.GA32764@redhat.com> <20110331030917.GB26057@redhat.com> <20110331035511.GA1255@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1161 Lines: 29 Em Wed, Mar 30, 2011 at 10:32:11PM -0700, Linus Torvalds escreveu: > On Wed, Mar 30, 2011 at 8:55 PM, Dave Jones wrote: > > I tried that, and wasn't particularly enlightened. > > > > + ? ? ?6.53% ?kworker/1:2 ?[kernel.kallsyms] ?[k] read_hpet > > + ? ? ?4.83% ?kworker/0:0 ?[kernel.kallsyms] ?[k] read_hpet > > Go into those, deeper into the callchain. That's how to see what the > upper-level problem is - by seeing who actually calls it. The leafs > themselves (where the time is obviously spent) don't tend to be very > informative, no. Yeah, please press 'E' since you're using the TUI, where you can expand collapse callchains in all its levels. Pressing 'E' will expand all of them, 'C' will collapse it all. Enter on lines with a '+' will expand just that one, etc. Press 'h' to get more help. Or use 'perf report --stdio' and you'll get it all expanded and in plain text. - Arnaldo -- 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/