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Message-ID: <20110331142135.GB25095@ghostprotocols.net> Date: Thu, 31 Mar 2011 11:21:35 -0300 From: Arnaldo Carvalho de Melo <acme@...stprotocols.net> To: Dave Jones <davej@...hat.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Linux Kernel <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org> Subject: Re: excessive kworker activity when idle. (was Re: vma corruption in today's -git) Em Wed, Mar 30, 2011 at 10:32:11PM -0700, Linus Torvalds escreveu: > On Wed, Mar 30, 2011 at 8:55 PM, Dave Jones <davej@...hat.com> 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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