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?

I will have a look at that...

> The page fault codepath acquires both.
> How often is the page table lock acquired per page fault? Just once or
> multiple spin_lock calls per page fault? Is the problem contention or
> cache line trashing?

The page table lock seems to be acquired at least 2 times and up to 5
times per page fault.
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