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Date: Mon, 25 Mar 2013 20:47:42 +0700
Message-ID: <CA+i8gK+DNOk5tvRsVJFKyk0A2qOD_az7yJ5+3Y2xS=Ear1VkVA@mail.gmail.com>
Subject: Re: ipc,sem: sysv semaphore scalability
From: Emmanuel Benisty <benisty.e@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@surriel.com>, Davidlohr Bueso <davidlohr.bueso@hp.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>, hhuang@redhat.com,
        "Low, Jason" <jason.low2@hp.com>,
        Michel Lespinasse <walken@google.com>,
        Larry Woodman <lwoodman@redhat.com>,
        "Vinod, Chegu" <chegu_vinod@hp.com>
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On Mon, Mar 25, 2013 at 12:10 AM, Linus Torvalds
<torvalds@linux-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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