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From: Ingo Molnar <mingo@elte.hu>
To: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>,
	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 12:04:31 +0200	[thread overview]
Message-ID: <20070404100431.GB19120@elte.hu> (raw)
In-Reply-To: <20070404031502.GA23591@in.ibm.com>


* Srivatsa Vaddagiri <vatsa@in.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

  reply	other threads:[~2007-04-04 10:05 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
2007-04-04 10:04                 ` Ingo Molnar [this message]
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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