Re: page fault fastpath: Increasing SMP scalability by introducing pte locks?

Christoph Lameter
2004-08-16T15:24:32Z

On Mon, 16 Aug 2004, Ray Bryant wrote:

> Something else to worry about here is mm->rss. Previously, this was updated
> only with the page_table_lock held, so concurrent increments were not a
> problem. rss may need to converted be an atomic_t if you use pte_locks.
> It may be that an approximate value for rss is good enough, but I'm not sure
> how to bound the error that could be introduced by a couple of hundred
> processers handling page faults in parallel and updating rss without locking
> it or making it an atomic_t.

Correct. There are a number of issues that may have to be addressed but
first we need to agree on a general idea how to proceed.