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    SubjectRe: rsdl:mouse freezing while doing git-gc
    On 12/04/07, surya.prabhakar@wipro.com <surya.prabhakar@wipro.com> wrote:
    > > [...]
    > >
    > > btw, it's sd-0.39, isn't?
    > No! it is not. I have updated it to 2.6.21-rc5-sd-0.39.patch and
    > did the same tests.

    It's nice-dependent. At least, that's something one would expect from
    this design..

    > PRI values s constantly changing while the git-gc is running. Is this
    > expected behaviour?

    Yep. Each nice level has a set of dynamic priorities which can be be
    used by a task. After exhausting a time quota on a current level, the
    task is moved to another (if there are no more -> "expired" array). So
    the "PRI" field shows the current dynamic level.
    The exceptions are SCHED_BATCH and Real-Time (FIFO and RR) tasks which
    have different priority scheme.

    /*
    * This contains a bitmap for each dynamic priority level with empty slots
    * for the valid priorities each different nice level can have. It allows
    * us to stagger the slots where differing priorities run in a way that
    * keeps latency differences between different nice levels at a minimum.
    * ie, where 0 means a slot for that priority, priority running from left to
    * right:
    * nice -20 0000000000000000000000000000000000000000
    * nice -10 1001000100100010001001000100010010001000
    * nice 0 0101010101010101010101010101010101010101
    * nice 5 1101011010110101101011010110101101011011
    * nice 10 0110111011011101110110111011101101110111
    * nice 15 0111110111111011111101111101111110111111
    * nice 19 1111111111111111111011111111111111111111

    As you can see there is only a single possible level for nice 19
    tasks, that's why your first results looked strange _but_ it might
    have been due to the old version which lacks the prio_matrix (or it
    was broken.. PRI == 0 for NICE 19 is very strabge indeed). So it's
    good you have upgraded to the recent one.

    I have made a small debugging extension that allows to monitor all the
    priority levels (and how many times) being used by a given task
    (configured via proc).. will test it later (don't have sd-enabled
    kernel here). Just want to be sure that the "rules" are never broken.
    Most likely Con did it already but as he is off-line we can't know.

    >
    > Did another test with hackbench and git-gc both at same priorities
    > and captured the top output, in here all of them seem to have
    > same priority..

    Yep, this one looks good.


    > thanks.
    >
    > surya.

    --
    Best regards,
    Dmitry Adamushko
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