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    SubjectRe: [CFT][RFC] HT scheduler


    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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