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From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
To: Gautham R Shenoy <ego@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>,
	akpm@linux-foundation.org, paulmck@us.ibm.com,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	Oleg Nesterov <oleg@tv-sign.ru>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	dipankar@in.ibm.com, dino@in.ibm.com,
	masami.hiramatsu.pt@hitachi.com
Subject: Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2)
Date: Wed, 4 Apr 2007 08:45:02 +0530	[thread overview]
Message-ID: <20070404031502.GA23591@in.ibm.com> (raw)
In-Reply-To: <20070403141516.GB14900@in.ibm.com>

On Tue, Apr 03, 2007 at 07:45:16PM +0530, Gautham R Shenoy wrote:
> > Should we ignore this for the timebeing and take up later as and when
> > users report problems?
> 
> In my case, the problem of freezer failing was due to the vfork freezer race
> in do_fork. The parent task was waiting_for_completion() while the child was
> frozen.

Good catch and ...

> 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.

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.

-- 
Regards,
vatsa

  parent reply	other threads:[~2007-04-04  3:07 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-02  5:34 [RFC] Cpu-hotplug: Using the Process Freezer (try2) Gautham R Shenoy
2007-04-02  5:37 ` [PATCH 1/8] Enhance process freezer interface for usage beyond software suspend Gautham R Shenoy
2007-04-02 13:56   ` Pavel Machek
2007-04-02 20:48     ` Rafael J. Wysocki
2007-04-02 20:51       ` Pavel Machek
2007-04-06 14:34         ` Rafael J. Wysocki
2007-04-06 22:20           ` Nigel Cunningham
2007-04-07  9:33             ` Rafael J. Wysocki
2007-04-07  9:47               ` Nigel Cunningham
2007-04-09  3:04         ` Gautham R Shenoy
2007-04-03  7:59       ` Gautham R Shenoy
2007-04-05  9:46   ` Oleg Nesterov
2007-04-05 10:59     ` Gautham R Shenoy
2007-04-05 11:30       ` Oleg Nesterov
2007-04-02  5:37 ` [PATCH 2/8] Make process freezer reentrant Gautham R Shenoy
2007-04-05  9:53   ` Oleg Nesterov
2007-04-05 10:19     ` Gautham R Shenoy
2007-04-02  5:38 ` [PATCH 3/8] Use process freezer for cpu-hotplug Gautham R Shenoy
2007-04-05 10:53   ` Oleg Nesterov
2007-04-05 12:14     ` Gautham R Shenoy
2007-04-05 13:34       ` Oleg Nesterov
2007-04-06 17:27   ` Nathan Lynch
2007-04-06 17:34     ` Ingo Molnar
2007-04-06 17:47       ` Nathan Lynch
2007-04-06 22:22         ` Nigel Cunningham
2007-04-14 18:48       ` Pavel Machek
2007-04-02  5:39 ` [PATCH 4/8] Rip out lock_cpu_hotplug() Gautham R Shenoy
2007-04-02  5:40 ` [PATCH 5/8] __cpu_up: use singlethreaded workqueue Gautham R Shenoy
2007-04-05 12:08   ` Oleg Nesterov
2007-04-02  5:41 ` [PATCH 6/8] Make non-singlethreaded workqueues freezeable by default Gautham R Shenoy
2007-04-05 11:57   ` Oleg Nesterov
2007-04-05 20:06     ` Andrew Morton
2007-04-02  5:42 ` [PATCH 7/8] Clean up workqueue.c with respect to the freezer based cpu-hotplug Gautham R Shenoy
2007-04-03 11:47   ` Oleg Nesterov
2007-04-03 13:59     ` Srivatsa Vaddagiri
2007-04-03 15:03       ` Oleg Nesterov
2007-04-03 17:18         ` Srivatsa Vaddagiri
2007-04-04 15:28           ` Oleg Nesterov
2007-04-04 17:49             ` Srivatsa Vaddagiri
2007-04-05 12:20               ` Oleg Nesterov
2007-04-12  2:22           ` Srivatsa Vaddagiri
2007-04-12 10:01             ` Gautham R Shenoy
2007-04-12 16:00             ` Oleg Nesterov
2007-04-13  9:46               ` Gautham R Shenoy
2007-04-02  5:42 ` [PATCH 8/8] Make kernel threads freezeable for cpu-hotplug Gautham R Shenoy
2007-04-02  6:16 ` [RFC] Cpu-hotplug: Using the Process Freezer (try2) Ingo Molnar
2007-04-02  9:28   ` Srivatsa Vaddagiri
2007-04-02 11:18     ` Ingo Molnar
2007-04-02 12:42       ` Srivatsa Vaddagiri
2007-04-02 14:16         ` Gautham R Shenoy
2007-04-02 18:56         ` Ingo Molnar
2007-04-03 12:56           ` Srivatsa Vaddagiri
2007-04-03 14:15             ` Gautham R Shenoy
2007-04-03 19:25               ` Rafael J. Wysocki
2007-04-04  3:15               ` Srivatsa Vaddagiri [this message]
2007-04-04 10:04                 ` Ingo Molnar
2007-04-04 10:41                   ` Gautham R Shenoy
2007-04-04 11:49                     ` Ingo Molnar
2007-04-04 12:24                       ` Gautham R Shenoy
2007-04-02 11:19   ` Gautham R Shenoy
2007-04-02 11:27     ` Ingo Molnar
2007-04-02 22:12       ` Rafael J. Wysocki
2007-04-02 13:22   ` Pavel Machek
2007-04-03 12:01   ` Gautham R Shenoy
2007-04-03 19:34     ` Rafael J. Wysocki
2007-04-03 20:24       ` Andrew Morton
2007-04-04 10:06         ` utrace merge Ingo Molnar
2007-04-04 10:36           ` Christoph Hellwig
2007-04-04 18:41             ` Andrew Morton
2007-04-03 14:01   ` [RFC] Cpu-hotplug: Using the Process Freezer (try2) Gautham R Shenoy

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