Re: page fault fastpath: Increasing SMP scalability by introducingpte locks?

[Christoph Lameter]

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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/