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From: Suresh Siddha <suresh.b.siddha@intel.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
	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 11:26:53 -0800	[thread overview]
Message-ID: <20080306192653.GI28006@linux-os.sc.intel.com> (raw)
In-Reply-To: <20080305194801.GB4386@ucw.cz>

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.

> ISTR glibc always using FPU...?

Apparently not, alteast not on my system. And also going forward, as we extend
this state, thought is nice to have.

thanks,
suresh

  reply	other threads:[~2008-03-06 19:27 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 [this message]
2008-03-06 21:21       ` Pavel Machek
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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