linux-kernel - Re: [PATCH 0/6] x86, fpu: cleanups, introduce non-lazy FPU restore for xsave

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Message-ID: <5037F317.7020606@zytor.com>
Date:	Fri, 24 Aug 2012 14:33:11 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
CC:	mingo@...nel.org, torvalds@...ux-foundation.org,
	andreas.herrmann3@....com, bp@...64.org, robert.richter@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] x86, fpu: cleanups, introduce non-lazy FPU restore
 for xsave

I have applied this to tip:x86/fpu, but I have also asked Suresh to
prepare a followon patch to decouple eager save from the existence of
the XSAVE instruction.  It seems pretty clear that eager save is a net
benefit in the presence of the XSAVEOPT, but it isn't as clear for only
having XSAVE, as far as I can tell.  Either way it would seem to be a
policy decision that is somewhat separate from the exact instruction.

	-hpa
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