On Tuesday, May 13, 2003 15:49:29 -0700 William Lee Irwin III <wli@holomorphy.com> wrote:
>> That doesn't sound like it's going to help, there isn't a unique
>> mmap_sem to be taken and so we just get caught between acquisitions
>> with the same problem.
On Tue, May 13, 2003 at 06:00:08PM -0500, Dave McCracken wrote:
> Actually it does fix it. I added code in vmtruncate_list() to do a
> down_write(&vma->vm_mm->mmap_sem) around the zap_page_range(), and the
> problem went away. It serializes against any outstanding page faults on a
> particular page table. New faults will see that the page is no longer in
> the file and fail with SIGBUS. Andrew's test case stopped failing.
> I've attached the patch so you can see what I did.
> Can anyone think of any gotchas to this solution?
How many processes are you doing this with? If it's a small number can
you try it with 1000 or so?
-- wli
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