From: Andi Kleen <andi@firstfloor.org>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de,
andi@firstfloor.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
Date: Sun, 24 Feb 2008 13:20:05 +0100 [thread overview]
Message-ID: <20080224122005.GA13637@one.firstfloor.org> (raw)
In-Reply-To: <20080224023547.412501000@linux-os.sc.intel.com>
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.
-andi
next prev parent reply other threads:[~2008-02-24 12:19 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 [this message]
2008-02-24 16:32 ` Siddha, Suresh B
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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