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Date: Fri, 25 Feb 2011 11:59:23 -0800
Message-ID: <AANLkTinLv=oy5_nPdziV6gpG-BLedsrNF0ew4Wz3x690@mail.gmail.com>
Subject: Re: [PATCH 06/17] arm: mmu_gather rework
From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>, Avi Kivity <avi@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, Rik van Riel <riel@redhat.com>,
        Ingo Molnar <mingo@elte.hu>, akpm@linux-foundation.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
        linux-mm@kvack.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        David Miller <davem@davemloft.net>, Mel Gorman <mel@csn.ul.ie>,
        Nick Piggin <npiggin@kernel.dk>,
        Paul McKenney <paulmck@linux.vnet.ibm.com>,
        Yanmin Zhang <yanmin_zhang@linux.intel.com>,
        Russell King <rmk@arm.linux.org.uk>, "Luck,Tony" <tony.luck@intel.com>,
        PaulMundt <lethal@linux-sh.org>
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On Fri, Feb 25, 2011 at 11:45 AM, Peter Zijlstra <peterz@infradead.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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