linux-kernel - Re: [RFC][PATCH 6/8] mm: handle_speculative

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Message-ID: <28c262361001042200k3e5a5ef9v42400120cbd33b61@mail.gmail.com>
Date:	Tue, 5 Jan 2010 15:00:42 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, cl@...ux-foundation.org,
	"hugh.dickins" <hugh.dickins@...cali.co.uk>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

On Tue, Jan 5, 2010 at 1:43 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Tue, 5 Jan 2010 13:29:40 +0900
> Minchan Kim <minchan.kim@...il.com> wrote:
>
>> Hi, Kame.
>>
>> On Tue, Jan 5, 2010 at 9:25 AM, KAMEZAWA Hiroyuki
>> <kamezawa.hiroyu@...fujitsu.com> wrote:
>> > On Mon, 04 Jan 2010 19:24:35 +0100
>> > Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>> >
>> >> Generic speculative fault handler, tries to service a pagefault
>> >> without holding mmap_sem.
>> >>
>> >> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>> >
>> >
>> > I'm sorry if I miss something...how does this patch series avoid
>> > that vma is removed while __do_fault()->vma->vm_ops->fault() is called ?
>> > ("vma is removed" means all other things as freeing file struct etc..)
>>
>> Isn't it protected by get_file and iget?
>> Am I miss something?
>>
> Only kmem_cache_free() part of following code is modified by the patch.

That's it I missed. Thanks, Kame. ;-)
-- 
Kind regards,
Minchan Kim
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