linux-kernel - Re: [PATCH v2 0/4] ipc: reduce ipc lock contention

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Message-ID: <1362645933.2606.14.camel@laptop>
Date:	Thu, 07 Mar 2013 09:45:33 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Rik van Riel <riel@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Waiman Long <Waiman.Long@...com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	Emmanuel Benisty <benisty.e@...il.com>,
	"Vinod, Chegu" <chegu_vinod@...com>,
	"Low, Jason" <jason.low2@...com>, "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>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>, chris.mason@...ionio.com
Subject: Re: [PATCH v2 0/4] ipc: reduce ipc lock contention

On Tue, 2013-03-05 at 15:53 -0500, Rik van Riel wrote:

> Indeed.  Though how well my patches will work with Oracle will
> depend a lot on what kind of semctl syscalls they are doing.
> 
> Does Oracle typically do one semop per semctl syscall, or does
> it pass in a whole bunch at once?

https://oss.oracle.com/~mason/sembench.c

I think Chris wrote that to match a particular pattern of semaphore
operations the database engine in question does. I haven't checked to
see if it triggers the case in point though.

Also, Chris since left Oracle but maybe he knows who to poke.

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