Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

[KAMEZAWA Hiroyuki]

On Fri, 8 Jan 2010 09:23:33 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:

> On Thu, 7 Jan 2010 14:33:50 -0800 (PST)
> Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> 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....
Sorry please ignore the last line...

Sorry for noise.
-Kame

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