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

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Message-ID: <CAGjg+kGErUbt5JS7SLCGtUO_JKk0LtkpyM4JgFUsxHME53k=hQ@mail.gmail.com>
Date:	Wed, 16 May 2012 18:58:58 +0800
From:	Alex Shi <lkml.alex@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alex Shi <alex.shi@...el.com>, Nick Piggin <npiggin@...il.com>,
	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,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm

On Wed, May 16, 2012 at 4:58 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2012-05-16 at 16:53 +0800, Alex Shi wrote:
>>
>> Sorry. Do you mean not every archs use 'include/asm-generic/tlb.h', so
>> the assignment of tlb->start in tlb_gather_mmu make trouble?
>>
> Yes exactly. I know you work for Intel, but surely its not forbidden by
> contract to look outside of arch/x86/ ? I know!, look at arch/ia64/
> that's still Intel.

:) It is my fault. 'make cscope' just help me focus insight into x86.

But frankly speaking, it looks mess that every arch implement similar fields of
 mmu_gather. If someone can unify the common fields of mmu_gather, and
left private field for specific arch. it will be great and much helpful.

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