Re: page fault scalability patch V11 [0/7]: overview

From: William Lee Irwin III <>
Date: 2004-11-20 13:41:04
William Lee Irwin III wrote:
>> Unprivileged triggers for full-tasklist scans are NMI oops material.

On Sat, Nov 20, 2004 at 01:25:37PM +1100, Nick Piggin wrote:
> What about pushing the per-thread rss delta back into the global atomic
> rss counter in each schedule()?
> Pros:
> This would take the task exiting problem into its stride as a matter of
> course.
> Single atomic read to get rss.
> Cons:
> would just be moving the atomic op somewhere else if we don't get
> many page faults per schedule.
> Not really nice dependancies.
> Assumes schedule (not context switch) must occur somewhat regularly.
> At present this is not true for SCHED_FIFO tasks.
> Too nasty?

This doesn't sound too hot. There's enough accounting that can't be
done anywhere but schedule(), and this can be done elsewhere. Plus,
you're moving an already too-frequent operation to a more frequent

-- wli
To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to
More majordomo info at
Received on Fri Nov 19 23:57:43 2004

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:32 EST