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

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Message-Id: <20100108092333.1040c799.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 8 Jan 2010 09:23:33 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>,
	"hugh.dickins" <hugh.dickins@...cali.co.uk>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

On Thu, 7 Jan 2010 14:33:50 -0800 (PST)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Thu, 7 Jan 2010, Peter Zijlstra wrote:
> >
> > I haven't yet looked at the patch, but isn't expand_stack() kinda like
> > what you want? That serializes using anon_vma_lock().
> 
> Yeah, that sounds like the right thing to do.  It is the same operation, 
> after all (and has the same effects, especially for the special case of 
> upwards-growing stacks).
> 
> So basically the idea is to extend that stack expansion to brk(), and 
> possibly mmap() in general.
> 
Hmm, do_brk() sometimes unmap conflicting mapping. Isn't it be a problem ?
Stack expansion just fails and SEGV if it hit with other mmaps....

Thanks,
-Kame





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