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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 - 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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