linux-kernel - Re: [RFC PATCH 0/2] ipc: do not hold ipc lock more than necessary

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

Hi,

On Sat, Mar 2, 2013 at 7:16 AM, Davidlohr Bueso <davidlohr.bueso@...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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