linux-kernel - Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb

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Date:	Tue, 15 May 2012 11:11:14 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Alex Shi <alex.shi@...el.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, arnd@...db.de,
	rostedt@...dmis.org, fweisbec@...il.com, jeremy@...p.org,
	riel@...hat.com, luto@....edu, avi@...hat.com, len.brown@...el.com,
	dhowells@...hat.com, fenghua.yu@...el.com, borislav.petkov@....com,
	yinghai@...nel.org, ak@...ux.intel.com, cpw@....com,
	steiner@....com, akpm@...ux-foundation.org, penberg@...nel.org,
	hughd@...gle.com, rientjes@...gle.com,
	kosaki.motohiro@...fujitsu.com, n-horiguchi@...jp.nec.com,
	tj@...nel.org, oleg@...hat.com, axboe@...nel.dk, jmorris@...ei.org,
	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, yongjie.ren@...el.com
Subject: Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm

On Tue, 2012-05-15 at 16:55 +0800, Alex Shi wrote:
> Not every flush_tlb_mm execution moment is really need to evacuate all
> TLB entries, like in munmap, just few 'invlpg' is better for whole
> process performance, since it leaves most of TLB entries for later
> accessing.
> 
> This patch is changing flush_tlb_mm(mm) to flush_tlb_mm(mm, start,
> end)
> in cases. 

Ok, so you're not getting it.

NACKED-BY: Peter Zijlstra <a.p.zijlstra@...llo.nl>
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