linux-kernel - Re: [patch 2/2] x86, fpu: lazy allocation of FPU area

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Message-ID: <20080306212116.GC1747@elf.ucw.cz>
Date:	Thu, 6 Mar 2008 22:21:16 +0100
From:	Pavel Machek <pavel@....cz>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	mingo@...e.hu, hpa@...or.com, tglx@...utronix.de,
	andi@...stfloor.org, hch@...radead.org,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [patch 2/2] x86, fpu: lazy allocation of FPU area - v3

On Thu 2008-03-06 11:26:53, Suresh Siddha wrote:
> On Wed, Mar 05, 2008 at 08:48:01PM +0100, Pavel Machek wrote:
> > On Mon 2008-03-03 15:02:46, Suresh Siddha wrote:
> > > Only allocate the FPU area when the application actually uses FPU, i.e., in the
> > > first lazy FPU trap. This could save memory for non-fpu using apps.
> > 
> > How many such apps are on your system, and how much does this
> > 'optimalization' cost?
> 
> On a normal kernel boot, where there are 200 or so tasks running, only 20
> or so apps seem to be using FPU.

Aha, now I see it is useful ;-).
									Pavel
-- 
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