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Date: Wed, 4 Apr 2007 12:04:31 +0200
From: Ingo Molnar <mingo@...e.hu>
To: Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc: Gautham R Shenoy <ego@...ibm.com>, akpm@...ux-foundation.org,
paulmck@...ibm.com, torvalds@...ux-foundation.org,
linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...sign.ru>,
"Rafael J. Wysocki" <rjw@...k.pl>, dipankar@...ibm.com,
dino@...ibm.com, masami.hiramatsu.pt@...achi.com
Subject: Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2)
* Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:
> > Rafael has already sent out the fix for that, but for some reason I
> > don't see it in the -mm.
> >
> > With that fix, freezer and hence hotplug succeeds even when I am
> > running a 'make -j' test.
nice!
> Good to know that!
>
> So Ingo/Rafael, should we ignore the problem of "TASK_UNINTERRUPTIBLE
> sleepers can break freezer" for the timebeing? Mainly because its not
> trivial to solve and we need to tackle it case by case basis as and
> when users report specific problems.
yeah, i think you are right - and the TASK_UNINTERRUPTIBLE thing is not
only quite complex, it also breaks the symmetry of freezer use
(sw-suspend obviously cannot freeze uninterruptible tasks). We should
watch whether the current latency of freezing is good enough in
practice.
Ingo
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