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

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Message-ID: <1363902605.4488.33.camel@thor.lan>
Date:	Thu, 21 Mar 2013 17:50:05 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...riel.com>, torvalds@...ux-foundation.org,
	davidlohr.bueso@...com, linux-kernel@...r.kernel.org,
	hhuang@...hat.com, jason.low2@...com, walken@...gle.com,
	lwoodman@...hat.com, chegu_vinod@...com,
	Dave Jones <davej@...hat.com>
Subject: Re: ipc,sem: sysv semaphore scalability

On Thu, 2013-03-21 at 14:10 -0700, Andrew Morton wrote:
> On Wed, 20 Mar 2013 15:55:30 -0400 Rik van Riel <riel@...riel.com> wrote:
> 
> > This series makes the sysv semaphore code more scalable,
> > by reducing the time the semaphore lock is held, and making
> > the locking more scalable for semaphore arrays with multiple
> > semaphores.
> > 
> > The first four patches were written by Davidlohr Buesso, and
> > reduce the hold time of the semaphore lock.
> > 
> > The last three patches change the sysv semaphore code locking
> > to be more fine grained, providing a performance boost when
> > multiple semaphores in a semaphore array are being manipulated
> > simultaneously.
> 
> These patches conflict pretty badly with Peter's:

On one point I'm a little confused: my series has been in linux-next for
a while. On what tree is this series based?


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