linux-kernel - Re: [PATCH 2/3] x86: mm: Change tlb_flushall

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Message-ID: <52B03C84.1000600@linaro.org>
Date:	Tue, 17 Dec 2013 19:59:00 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Mel Gorman <mgorman@...e.de>, H Peter Anvin <hpa@...or.com>,
	Linux-X86 <x86@...nel.org>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH 2/3] x86: mm: Change tlb_flushall_shift for IvyBridge

On 12/16/2013 09:59 PM, Ingo Molnar wrote:
> So if the kbuild speedup of 1-2% is true and reproducable then that 
> might be worth doing.

I have a Intel desktop and need it for daily works. Wonder if Intel guys
like to have a try? I assume the patch is already in Fengguang's testing
system.
> 
> Building the kernel is obviously a prime workload - and given that the 
> kernel is active only about 10% of the time for a typical kernel 
> build, a 1-2% speedup means a 10-20% speedup in kernel performance 
> (which sounds a bit too good at first glance).

Maybe a extra time tlb flush causes more tlb refill that cost much user
space time.
-- 
Thanks
    Alex
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