linux-kernel - Re: excessive kworker activity when idle. (was Re: vma corruption in today's -git)

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Message-ID: <AANLkTik=WBy7CRQSENiiRfi2BFtwL5iT9d3RBK4uZz1d@mail.gmail.com>
Date:	Thu, 31 Mar 2011 08:58:14 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>,
	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)

On Thu, Mar 31, 2011 at 8:49 AM, Dave Jones <davej@...hat.com> wrote:
>
> That's a recent change though, and I first saw this back in November.

So your November report said that you could see "thousands" of these a
second. But maybe it didn't use up all CPU until recently?

Especially if you have a high CONFIG_HZ value, you'd still see a
thousand flushes a second even with the old "delay a bit". So it would
use a fair amount of CPU, and certainly waste a lot of power. But it
wouldn't pin the CPU entirely.

With that commit f23eb2b2b285, the buggy case would become basically
totally CPU-bound.

I dunno. Right now 'trinity' just ends up printing out a lot of system
call errors for me. I assume that's its normal behavior?

                               Linus
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