Re: [CFT][RFC] HT scheduler

[Nick Piggin]

William Lee Irwin III wrote:

> On Thu, Dec 11, 2003 at 07:57:31PM +1100, Nick Piggin wrote:
>
> > OK, it is spinning on .text.lock.futex. The following results are
> > top 10 profiles from a 120 rooms run and a 150 rooms run. The 150
> > room run managed only 24.8% the throughput of the 120 room run.
> > Might this be a JVM problem?
> > I'm using Sun Java HotSpot(TM) Server VM (build 1.4.2_01-b06, mixed mode)
> >           ROOMS          120             150
> > PROFILES
> > total                   100.0%          100.0%
> > default_idle             81.0%           66.8%
> > .text.lock.rwsem          4.6%            1.3%
> > schedule                  1.9%            1.4%
> > .text.lock.futex          1.5%           19.1%
> > __wake_up                 1.1%            1.3%
> > futex_wait                0.7%            2.8%
> > futex_wake                0.7%            0.5%
> > .text.lock.dev            0.6%            0.2%
> > rwsem_down_read_failed    0.5%
> > unqueue_me                                3.2%
>
> If this thing is heavily threaded, it could be mm->page_table_lock.

I'm not sure how threaded it is, probably very. Would inline spinlocks
help show up mm->page_table_lock?

It really looks like .text.lock.futex though, doesn't it? Would that be
the hashed futex locks? I wonder why it suddenly goes downhill past about
140 rooms though.



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