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

[KAMEZAWA Hiroyuki]

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....

Thanks,
-Kame





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