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

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Message-ID: <515B371D.9010809@oracle.com>
Date:	Tue, 02 Apr 2013 15:53:01 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Peter Hurley <peter@...leysoftware.com>,
	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...riel.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	hhuang@...hat.com, "Low, Jason" <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	Larry Woodman <lwoodman@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>,
	Stanislav Kinsbursky <skinsbursky@...allels.com>
Subject: Re: ipc,sem: sysv semaphore scalability

On 04/02/2013 01:52 PM, Linus Torvalds wrote:
> On Tue, Apr 2, 2013 at 9:08 AM, Sasha Levin <sasha.levin@...cle.com> wrote:
>>
>> By just playing with the 'msgsz' parameter with MSG_COPY set.
> 
> Hmm. Looking closer, I suspect you're testing without commit
> 88b9e456b164 ("ipc: don't allocate a copy larger than max"). That
> should limit the size passed in to prepare_copy -> load_copy to
> msg_ctlmax.

That commit has a revert in the -next trees, do we need a revert
of the revert?

	commit ff6577a3e714ccae02d4400e989762c19c37b0b3
	Author: Andrew Morton <akpm@...ux-foundation.org>
	Date:   Wed Mar 27 10:24:02 2013 +1100
	
	    revert "ipc: don't allocate a copy larger than max"
	
	    Revert 88b9e456b164.  Dave has confirmed that this was causing oopses
	    during trinity testing.
	
	    Cc: Peter Hurley <peter@...leysoftware.com>
	    Cc: Stanislav Kinsbursky <skinsbursky@...allels.com>
	    Reported-by: Dave Jones <davej@...hat.com>
	    Cc: <stable@...r.kernel.org>
	    Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>



Thanks,
Sasha
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