linux-kernel - Re: [PATCH 06/17] arm: mmu

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Message-ID: <AANLkTinLv=oy5_nPdziV6gpG-BLedsrNF0ew4Wz3x690@mail.gmail.com>
Date:	Fri, 25 Feb 2011 11:59:23 -0800
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>, Mel Gorman <mel@....ul.ie>,
	Nick Piggin <npiggin@...nel.dk>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	Russell King <rmk@....linux.org.uk>,
	"Luck,Tony" <tony.luck@...el.com>, PaulMundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 06/17] arm: mmu_gather rework

On Fri, Feb 25, 2011 at 11:45 AM, Peter Zijlstra <peterz@...radead.org> wrote:

> Grmbl.. so doing that would require flush_tlb_range() to take an mm, not
> a vma, but tile and arm both use the vma->flags & VM_EXEC test to avoid
> flushing their i-tlbs.
>
> I'm tempted to make them flush i-tlbs unconditionally as its still
> better than hitting an mm wide tlb flush due to the page table free.
>
> Ideas?

What's wrong with using vma->vm_mm?

Hugh
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