Re: page fault fastpath: Increasing SMP scalability by introducingpte

[Christoph Lameter]

On Sun, 15 Aug 2004, Manfred Spraul wrote:

> Very odd. Why do you see a problem with the page_table_lock but no
> problem from the mmap semaphore?

Because there is a only a down_read() call for the mmap semaphore before
invoking handle_mm_fault. This is a rw semaphore which means that multiple
processors/processes may be entering handle_mm_fault with a read lock on
the mmap semaphore.
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