Re: excessive kworker activity when idle. (was Re: vma corruption intoday's -git)
From: Linus Torvalds
Date: Thu Mar 31 2011 - 11:54:26 EST
And with your fixed trinity thing, I can now do this:
On Wed, Mar 30, 2011 at 9:08 PM, Dave Jones <davej@xxxxxxxxxx> wrote:
>
> git clone git://git.codemonkey.org.uk/trinity
> cd trinity ; make
> ./trinity --mode=random -i
>
> let it run for a while, then kill it. kworker should then go nuts.
I really thought "hey, that reproduced it", because "top" did indeed
show kworker going nuts after a while. And perf did show it doing all
that
| queue_work
| schedule_work
| flush_to_ldisc
that looks like the re-scheduling.
But when I killed trinity, kworker immediately calmed down too.
Which I'd actually expect, since any tty it is using (and making cause
problem) should calm down when it's closed - even if it was stuck
before.
But maybe I haven't triggered just the right condition to actually get
it into some really infinite case.
Regardless, I'll put my money where my mouth is, and try to remove the
crazy re-flush thing.
Linus
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