linux-kernel - Re: [patch] CFS scheduler, v3

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Message-ID: <20070424180633.GG5475@linux-os.sc.intel.com>
Date:	Tue, 24 Apr 2007 11:06:34 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Christoph Lameter <clameter@....com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	William Lee Irwin III <wli@...omorphy.com>,
	Ingo Molnar <mingo@...e.hu>, 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>
Subject: Re: [patch] CFS scheduler, v3

On Tue, Apr 24, 2007 at 10:55:45AM -0700, Christoph Lameter wrote:
> On Tue, 24 Apr 2007, Siddha, Suresh B wrote:
> > yes, we were planning to move this to a different percpu section, where
> > all the elements in this new section will be cacheline aligned(both
> > at the start, aswell as end)
> 
> I would not call this a per cpu area. It is used by multiple cpus it 
> seems. 

not decided about the name yet. but the area is allocated per cpu and yes,
the data can be referred by other cpus.

> But for 0.5%? on what benchmark? Is is really worth it?

famous database workload :)

I don't think the new section will be added for this 0.5%. This is a straight
fwd optimization, and anyone can plug into this new section in future.

thanks,
suresh
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