linux-kernel - Re: [patch] x86, tlb: switch cr3 in leave

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Date:	Thu, 22 Mar 2012 17:37:03 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...nel.org>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] x86, tlb: switch cr3 in leave_mm() only when needed

On Thu, Mar 22, 2012 at 5:20 PM, H. Peter Anvin <hpa@...or.com> wrote:
>
> Looks great to me.  Linus, do you want this one later in the window if
> it tests out OK between now and then, or is it too late?

It's small and trivial, so it's fine. I *would* like to hear whether
it actually makes any real difference, though. I do see "intel_idle()"
as a big cost in idle profiles, and I assume that translates to power
use too, but if you guys have some actual numbers, that would be even
better.

                   Linus
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