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From: Pavel Machek <pavel@ucw.cz>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de,
	andi@firstfloor.org, hch@infradead.org,
	linux-kernel@vger.kernel.org,
	Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: [patch 2/2] x86, fpu: lazy allocation of FPU area - v3
Date: Thu, 6 Mar 2008 22:21:16 +0100	[thread overview]
Message-ID: <20080306212116.GC1747@elf.ucw.cz> (raw)
In-Reply-To: <20080306192653.GI28006@linux-os.sc.intel.com>

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
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  reply	other threads:[~2008-03-06 21:21 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-03 23:02 [patch 1/2] x86, fpu: split FPU state from task struct " Suresh Siddha
2008-03-03 23:02 ` [patch 2/2] x86, fpu: lazy allocation of FPU area " Suresh Siddha
2008-03-04  1:20   ` Christoph Hellwig
2008-03-04  1:43     ` Suresh Siddha
2008-03-04 10:32       ` Ingo Molnar
2008-03-04 17:55         ` Suresh Siddha
2008-03-05 19:47           ` Pavel Machek
2008-03-06 15:51             ` Ingo Molnar
2008-03-06 19:10               ` Suresh Siddha
2008-03-06 20:24               ` Pavel Machek
2008-03-06 20:52                 ` Andi Kleen
2008-03-07 12:29                 ` H. Peter Anvin
2008-03-07 13:06                   ` Arjan van de Ven
2008-03-07 13:18                     ` Andi Kleen
2008-03-07 13:20                       ` Arjan van de Ven
2008-03-07 13:27                         ` Andi Kleen
2008-03-05 19:48   ` Pavel Machek
2008-03-06 19:26     ` Suresh Siddha
2008-03-06 21:21       ` Pavel Machek [this message]
2008-03-04  1:18 ` [patch 1/2] x86, fpu: split FPU state from task struct " Christoph Hellwig
2008-03-04  1:36   ` Suresh Siddha
2008-03-04  8:20     ` Ingo Molnar
2008-03-06 12:39     ` Christoph Hellwig
2008-03-04 10:28 ` Ingo Molnar
2008-03-04 17:59   ` Suresh Siddha
2008-03-04 20:53     ` Ingo Molnar

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