Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()
From: Peter Zijlstra <peterz@infradead.org>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>, cl@linux-foundation.org,
       "hugh.dickins" <hugh.dickins@tiscali.co.uk>,
       Nick Piggin <nickpiggin@yahoo.com.au>, Ingo Molnar <mingo@elte.hu>
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Date: Tue, 05 Jan 2010 09:35:21 +0100
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On Tue, 2010-01-05 at 15:09 +0900, Minchan Kim wrote:

> Couldn't we synchronize rcu in that cases(munmap, exit and so on)?
> It can delay munap and exit but it would be better than handling them by more
> complicated things, I think. And both cases aren't often cases so we
> can achieve advantage than disadvantage?

Sadly there are programs that mmap()/munmap() at a staggering rate
(clamav comes to mind), so munmap() performance is important too.


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