From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de,
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
Date: Sun, 24 Feb 2008 08:32:29 -0800 [thread overview]
Message-ID: <20080224163228.GD27194@linux-os.sc.intel.com> (raw)
In-Reply-To: <20080224122005.GA13637@one.firstfloor.org>
On Sun, Feb 24, 2008 at 01:20:05PM +0100, Andi Kleen wrote:
> On Sat, Feb 23, 2008 at 06:34:39PM -0800, 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.
>
> Did you measure this making any difference?
>
> At least at some point glibc always touched the FPU once to initialize
> it.
Simple kernel boot showed that only 20 or so tasks using FPU, out of
200 or so tasks running.
thanks,
suresh
next prev parent reply other threads:[~2008-02-24 16:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-24 2:34 [patch 1/2] x86,fpu: split FPU state from task struct Suresh Siddha
2008-02-24 2:34 ` [patch 2/2] x86,fpu: lazy allocation of FPU area Suresh Siddha
2008-02-24 3:08 ` Christoph Hellwig
2008-02-24 12:20 ` Andi Kleen
2008-02-24 16:32 ` Siddha, Suresh B [this message]
2008-02-24 3:04 ` [patch 1/2] x86,fpu: split FPU state from task struct Christoph Hellwig
2008-02-24 7:22 ` Ingo Molnar
2008-02-24 16:30 ` Siddha, Suresh B
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