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

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Message-ID: <20130402200027.GE17422@redhat.com>
Date:	Tue, 2 Apr 2013 16:00:27 -0400
From:	Dave Jones <davej@...hat.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Hurley <peter@...leysoftware.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 Tue, Apr 02, 2013 at 03:53:01PM -0400, Sasha Levin wrote:
 > 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?

Yeah, I told Andrew to drop that, but I think he's travelling.

	Dave

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