Re: [patch] voluntary-preempt-2.6.8.1-P0

Lee Revell
2004-08-16T05:14:30Z

On Mon, 2004-08-16 at 00:51, Ingo Molnar wrote:
> * Lee Revell <rlrevell@joe-job.com> wrote:

> seems we need a lock-break in the innermost loop of copy_page_range().
> That loop processes up to 1024 pages currently, before the lock-break in
> the outer loop happens. Large GUI processes are more likely to have full
> 4MB regions mapped & populated.
>
> i suspect you could trigger a similarly bad latency by doing a fork() in
> mlockall-test.cc - the attached mlockall-test2.cc does this. Do you get
> bad latencies?
>

Yes, mlockall-test2 with 10+MB of memory produces a 200us-3ms xrun about
half the time.

Lee