linux-kernel - Re: ipc,sem: sysv semaphore scalability

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Date:	Mon, 25 Mar 2013 10:03:15 -0400
From:	Rik van Riel <riel@...riel.com>
To:	Emmanuel Benisty <benisty.e@...il.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hhuang@...hat.com,
	"Low, Jason" <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: Re: ipc,sem: sysv semaphore scalability

On 03/25/2013 10:00 AM, Rik van Riel wrote:
> On 03/25/2013 09:47 AM, Emmanuel Benisty wrote:
>> On Mon, Mar 25, 2013 at 12:10 AM, Linus Torvalds
>> <torvalds@...ux-foundation.org> wrote:
>>> And you never see this problem without Rik's patches?
>>
>> No, never.
>>
>>> Could you bisect
>>> *which* patch it starts with? Are the first four ones ok (the moving
>>> of the locking around, but without the fine-grained ones), for
>>> example?
>>
>> With the first four patches only, I got some X server freeze (just
>> tried once).
>
> Could you try booting with panic=1 so the kernel panics on the first
> oops?

Sorry that should be "oops=panic"

> Maybe that way (if we are lucky) we will be able to capture the first
> oops, and maybe get an idea of what causes the problem.

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