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

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Date:	Tue, 29 Nov 2011 13:31:09 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Hans Rosenfeld <hans.rosenfeld@....com>
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

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.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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