linux-kernel - Re: mmotm 2009-04-10-02-21 uploaded

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Message-ID: <20090413174104.GA856@elte.hu>
Date:	Mon, 13 Apr 2009 19:41:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Valdis.Kletnieks@...edu, Mike Travis <travis@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mm-commits@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	Dave Jones <davej@...hat.com>, Len Brown <lenb@...nel.org>
Subject: Re: mmotm 2009-04-10-02-21 uploaded - forkbombed by work_for_cpu


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> > I think Andrew has a stack of fixes queued up, one of which 
> > should solve this problem too - which Mike tested - as the 
> > commit from Andrew has caused another regression as well.
> > 
> > There's no sha1 - the patch is in this thread on lkml:
> > 
> >   sysbench(oltp)+mysql 10% regression with 2.6.30-rc1
> > 
> > | From: Andrew Morton <akpm@...ux-foundation.org>
> > |
> > | Atttempting to rid us of the problematic work_on_cpu().  Just use
> > | smp_call_fuction_single() here.
> > |
> > | This repairs a 10% sysbench(oltp)+mysql regression which Mike 
> > | reported,
> > 
> 
> Yup.  It's presently in Len's hands.  And Rusty's.
> 
> Vladis, perhaps you can verify?

I have not tested it but it looks good and the use of a much more 
atomic primitive can only improve the situation - so unless there's 
something suspicious about it i'd suggest for Linus to pick this up 
from email, before -rc2.

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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