Messages in this thread | | | Date | Mon, 19 Mar 2001 12:54:51 +0000 | From | "Stephen C. Tweedie" <> | Subject | Re: changing mm->mmap_sem (was: Re: system call for process information?) |
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Hi,
On Sun, Mar 18, 2001 at 10:34:38AM +0100, Manfred Spraul wrote:
> > The problem is that mmap_sem seems to be protecting the list > > of VMAs, so taking _only_ the page_table_lock could let a VMA > > change under us while a page fault is underway ... > > No, that can't happen.
It can. Page faults often need to block, so they have to be able to drop the page_table_lock. Holding the mmap_sem is all that keeps the vma intact until the IO is complete.
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