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References: <1362183392.3420.23.camel@buesod1.americas.hpqcorp.net>
Date: Sat, 2 Mar 2013 11:43:08 +0700
Message-ID: <CA+i8gKJ99-f0Q=kqf2=zY_kjSt8UE6jq0nETWmW0fSdnh00vCw@mail.gmail.com>
Subject: Re: [RFC PATCH 0/2] ipc: do not hold ipc lock more than necessary
From: Emmanuel Benisty <benisty.e@gmail.com>
To: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        "Vinod, Chegu" <chegu_vinod@hp.com>, "Low, Jason" <jason.low2@hp.com>,
        linux-tip-commits@vger.kernel.org,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>, aquini@redhat.com,
        Michel Lespinasse <walken@google.com>, Ingo Molnar <mingo@kernel.org>,
        Larry Woodman <lwoodman@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Hi,

On Sat, Mar 2, 2013 at 7:16 AM, Davidlohr Bueso <davidlohr.bueso@hp.com> wrote:
> The following set of not-thoroughly-tested patches are based on the
> discussion of holding the ipc lock unnecessarily, such as for permissions
> and security checks:
>
> https://lkml.org/lkml/2013/2/28/540
>
> Patch 0/1: Introduces new functions, analogous to ipc_lock and ipc_lock_check
> in the ipc utility code, allowing to obtain the ipc object without holding the lock.
>
> Patch 0/2: Use the new functions and only acquire the ipc lock when needed.

Not sure how much a work in progress this is but my machine dies
immediately when I start chromium, crappy mobile phone picture here:
http://i.imgur.com/S0hfPz3.jpg

Thanks.
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