linux-kernel - Re: [git pull] scheduler fixes

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Date:	Tue, 4 Dec 2007 22:04:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
Cc:	Greg KH <greg@...ah.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	herton@...driva.com.br, dvgevers@...all.nl
Subject: Re: [git pull] scheduler fixes


* Luiz Fernando N. Capitulino <lcapitulino@...driva.com.br> wrote:

> | >    git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git
> | > 
> | > It has another commit besides this fix. Thanks,
> | 
> | Can you make up something that I can apply for 2.6.23-stable?  or is 
> | this not an issue on that tree?
> 
>  FWIW I couldn't reproduce the problem with 2.6.23.9. sched_slice() is 
> quite different on that kernel and _maybe_ it won't never divide by 
> zero.

no, this is due to a fairly recent commit, so 2.6.23 should not be 
affected. (We cleaned up sched_rr_interval() in one of the 2.6.24 
scheduler commits.)

>  My original report on vendor-sec was wrong. I've said that 2.6.23.9 
> had the same bug but turns out the kernel I tested had the Ingo's CFS 
> backport patch applied. I didn't know that, I thought it was a vanilla 
> kernel.
> 
>  Btw, I think it's important to release a new CFS backport patch 
> because maybe some distro is using it (Mandriva stable kernel is using 
> the CFS backport patch, but we didn't update to latest version yet).

this should only affect the v24 CFS version - i've updated the v24 
backport patches. sched_rr_interval() is almost never used, and it's 
basically never used for SCHED_OTHER tasks.

	Ingo
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