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

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Message-ID: <CA+i8gK+DNOk5tvRsVJFKyk0A2qOD_az7yJ5+3Y2xS=Ear1VkVA@mail.gmail.com>
Date:	Mon, 25 Mar 2013 20:47:42 +0700
From:	Emmanuel Benisty <benisty.e@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rik van Riel <riel@...riel.com>,
	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 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).

> Another thing to try might be to enable SLUB debugging (ie make sure that all of
>
>   CONFIG_SLUB_DEBUG=y
>   CONFIG_SLUB=y
>   CONFIG_SLUB_DEBUG_ON=y
>
> are set in your kernel config)

My bad, I forgot to enable this in my former build, sorry. Here's what
I get now:
http://i.imgur.com/G6H8KgD.jpg
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