linux-kernel - Re: [REGRESSION 2.6.30][PATCH 1/1] sched: defer idle accounting till after load update period

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Date:	Tue, 13 Apr 2010 14:06:55 -0700
From:	Chase Douglas <chase.douglas@...onical.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	kernel-team <kernel-team@...ts.ubuntu.com>
Subject: Re: [REGRESSION 2.6.30][PATCH 1/1] sched: defer idle accounting till 
	after load update period

On Tue, Apr 13, 2010 at 2:02 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, 13 Apr 2010, Andrew Morton wrote:
>
>> On Thu, 1 Apr 2010 22:01:59 +0200 (CEST)
>> Thomas Gleixner <tglx@...utronix.de> wrote:
>>
>> > On Thu, 1 Apr 2010, Chase Douglas wrote:
>> > > On Thu, Apr 1, 2010 at 3:27 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
>> > >
>> > > Thomas Gleixner seems to think this isn't the best approach (later
>> > > email in this thread), so I'm deferring sending it unless someone is
>> > > still interested in this approach.
>> >
>> > Well, it's a good workaround for now I think, I just answered Andrews
>> > question whether we can't do any better :)
>> >
>>
>> So... should we merge Chase's patch?
>
> I have no better solution right now. Peter ?

I've made one small change to it. Checking the atomic .counter
variable probably isn't the most portable, and atomic_long_read()
should be portable and not add any overhead on sane platforms, so I
swapped out the check against .counter with an atomic_long_read().
I'll resend it shortly.

-- Chase
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