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    SubjectRe: [PATCH] Restore deterministic CPU accounting on powerpc

    * Paul Mackerras <> wrote:

    > Since powerpc started using CONFIG_GENERIC_CLOCKEVENTS, the
    > deterministic CPU accounting (CONFIG_VIRT_CPU_ACCOUNTING) has been
    > broken on powerpc, because we end up counting user time twice: once in
    > timer_interrupt() and once in update_process_times().
    > This fixes the problem by pulling the code in update_process_times
    > that updates utime and stime into a separate function called
    > account_process_tick. If CONFIG_VIRT_CPU_ACCOUNTING is not defined,
    > there is a version of account_process_tick in kernel/timer.c that
    > simply accounts a whole tick to either utime or stime as before. If
    > CONFIG_VIRT_CPU_ACCOUNTING is defined, then arch code gets to
    > implement account_process_tick.
    > This also lets us simplify the s390 code a bit; it means that the s390
    > timer interrupt can now call update_process_times even when
    > CONFIG_VIRT_CPU_ACCOUNTING is turned on, and can just implement a
    > suitable account_process_tick().
    > Signed-off-by: Paul Mackerras <>

    lets push this towards Linus via the scheduler tree, ok?

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      Last update: 2007-11-03 09:57    [W:0.021 / U:5.732 seconds]
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