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

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Message-ID: <51507301.3050601@surriel.com>
Date:	Mon, 25 Mar 2013 11:53:37 -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 11:20 AM, Emmanuel Benisty wrote:
> On Mon, Mar 25, 2013 at 9:03 PM, Rik van Riel <riel@...riel.com> wrote:
>>>> 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.
>
> Sorry Rik, I get all kind of weird behaviors (wireless dies, compiling
> gets stuck and is impossible to kill, can't kill X) with the 4
> patches+oops=panic but no trace. Here after is 7+1 patches with
> oops=panic boot: http://i.imgur.com/1jep1qx.jpg

This may be a stupid question, but you re-compile and re-install
the kernel modules every time you changed the kernel?

The behaviour you report with just the first four patches is so
random, it sounds almost like a mismatched data structure between
compiles...

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