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    SubjectRe: [PATCH] sched: cpuacct: Use bigger percpu counter batch values for stats counters

    Hi Martin,

    > For s390 the jiffies_to_cputime is a compile time constant. No need to
    > initialize it at runtime, no?

    Indeed it is, I didn't look closely enough. Same with ia64 so no work to
    do on either arch :)

    > The patch itself trades some accuracy (larger cpu accounting value that
    > are stored per-cpu) against runtime overhead (spinlock to transfer the
    > value to the global variable in __percpu_counter_add). Did you
    > calculate how big the loss in accuracy is?

    The idea is we are already batching percpu_counter_batch jiffies, so
    with CONFIG_VIRT_CPU_ACCOUNTING we batch the equivalent amount in


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