linux-kernel - Re: [PATCH 0/9] rework of extended state handling, LWP support

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Date:	Wed, 30 Nov 2011 18:37:46 +0100
From:	Hans Rosenfeld <hans.rosenfeld@....com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	<hpa@...or.com>, <tglx@...utronix.de>, <mingo@...e.hu>,
	<suresh.b.siddha@...el.com>, <eranian@...gle.com>,
	<brgerst@...il.com>, <robert.richter@....com>,
	<Andreas.Herrmann3@....com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/9] rework of extended state handling, LWP support

On Tue, Nov 29, 2011 at 01:31:09PM -0800, Andi Kleen wrote:
> Hans Rosenfeld <hans.rosenfeld@....com> writes:
> >
> > The lazy allocation of the xstate area has been removed. The support for
> > extended states that cannot be saved/restored lazily, like AMD's LWP,
> > need this. Since optimized library functions using SSE etc. are widely
> > used today, most processes would have an xstate area anyway, making the
> > memory overhead negligible.
> 
> Do you have any data on that?  It sounds dubious for specialized
> workloads.

What kind of specialized workload do you mean?


Hans


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