linux-kernel - Re: [patch] CFS scheduler, -v8

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Date:	Wed, 2 May 2007 13:17:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>, Mark Lord <lkml@....ca>,
	Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>
Subject: Re: [patch] CFS scheduler, -v8


* Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> The problem is with comparing a s64 values with (s64)ULONG_MAX, which 
> evaluates to -1. Then we check if exec_delta64 and fair_delta64 are 
> greater than (s64)ULONG_MAX (-1), if so we assign (s64)ULONG_MAX to 
> the respective values.

ah, indeed ...

> The fix is to compare these values against (s64)LONG_MAX and assign 
> (s64)LONG_MAX to exec_delta64 and fair_delta64 if they are greater 
> than (s64)LONG_MAX.
> 
> Tested on PowerPC, the regression is gone, tasks are load balanced as 
> they were in v7.

thanks, applied!

	Ingo
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