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From: Mark Lord <lkml@rtr.ca>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>,
	Radoslaw Szkodzinski <lkml@astralstorm.puszkin.org>,
	Ingo Molnar <mingo@elte.hu>,
	linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks
Date: Wed, 05 Dec 2007 17:31:28 -0500	[thread overview]
Message-ID: <475726C0.9060803@rtr.ca> (raw)
In-Reply-To: <20071203072328.371d0b00@laptopd505.fenrus.org>

Arjan van de Ven wrote:
> On Mon, 3 Dec 2007 11:27:15 +0100
> Andi Kleen <andi@firstfloor.org> wrote:
> 
>>> Kernel waiting 2 minutes on TASK_UNINTERRUPTIBLE is certainly
>>> broken.
>> What should it do when the NFS server doesn't answer anymore or 
>> when the network to the SAN RAID array located a few hundred KM away
>> develops some hickup?  Or just the SCSI driver decides to do lengthy
>> error recovery  -- you could argue that is broken if it takes longer 
>> than 2 minutes, but in practice these things are hard to test
>> and to fix.
>>
> 
> the scsi layer will have the IO totally aborted within that time anyway;
> the retry timeout for disks is 30 seconds after all.
..

Mmm.. but the SCSI layer may do many retries, each with 30sec timeouts..

      parent reply	other threads:[~2007-12-05 22:31 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-01  9:20 [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks Ingo Molnar
2007-12-01 18:31 ` David Rientjes
2007-12-01 18:33   ` Ingo Molnar
2007-12-01 18:42 ` David Rientjes
2007-12-01 19:36   ` Ingo Molnar
2007-12-02  0:54     ` Ingo Oeser
2007-12-02  8:58       ` Ingo Molnar
2007-12-02 15:52       ` David Rientjes
2007-12-02 18:57 ` Andi Kleen
2007-12-02 18:59   ` Ingo Molnar
2007-12-02 19:41     ` Arjan van de Ven
2007-12-02 20:08       ` Ingo Molnar
2007-12-02 20:09       ` Andi Kleen
2007-12-02 20:26         ` Ingo Molnar
2007-12-02 20:47           ` Andi Kleen
2007-12-02 21:10             ` Ingo Molnar
2007-12-02 21:19               ` Andi Kleen
2007-12-02 21:24                 ` Ingo Molnar
2007-12-02 21:34                   ` Andi Kleen
2007-12-02 22:25                     ` Ingo Molnar
2007-12-02 22:18                 ` Arjan van de Ven
2007-12-02 22:20                 ` Ingo Molnar
2007-12-03  0:00                   ` Andi Kleen
2007-12-02 22:43             ` Arjan van de Ven
2007-12-03  0:07               ` Andi Kleen
2007-12-03  0:59                 ` Arjan van de Ven
2007-12-03  9:55                   ` Andi Kleen
2007-12-03 10:15                     ` Radoslaw Szkodzinski
2007-12-03 10:23                       ` Ingo Molnar
2007-12-03 10:27                       ` Andi Kleen
2007-12-03 10:38                         ` Ingo Molnar
2007-12-03 11:04                           ` Andi Kleen
2007-12-03 11:59                             ` Ingo Molnar
2007-12-03 12:13                               ` Andi Kleen
2007-12-03 12:28                                 ` Ingo Molnar
2007-12-03 12:41                                   ` Andi Kleen
2007-12-03 13:00                                     ` Ingo Molnar
2007-12-03 13:14                                       ` Andi Kleen
     [not found]                                         ` <20071203132955.GA31354@elte.hu>
2007-12-03 13:41                                           ` Radoslaw Szkodzinski
2007-12-03 13:59                                             ` Ingo Molnar
2007-12-03 14:15                                               ` Andi Kleen
2007-12-03 13:48                                           ` Andi Kleen
2007-12-03 13:55                                             ` Ingo Molnar
2007-12-03 14:17                                               ` Andi Kleen
2007-12-03 14:33                                                 ` Ingo Molnar
2007-12-03 17:02                                                 ` Ray Lee
2007-12-03 13:50                                 ` Pekka Enberg
2007-12-03 13:57                                   ` Ingo Molnar
2007-12-03 14:14                                   ` Andi Kleen
2007-12-03 14:19                                     ` Ingo Molnar
2007-12-03 17:57                                       ` Andrew Morton
2007-12-03 18:28                                         ` Rafael J. Wysocki
2007-12-03 19:24                                           ` Ingo Molnar
2007-12-03 22:47                                             ` Rafael J. Wysocki
2007-12-04  0:05                                               ` Ingo Molnar
2007-12-03 15:23                         ` Arjan van de Ven
2007-12-03 16:36                           ` Andi Kleen
2007-12-05 22:31                           ` Mark Lord [this message]

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