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    Subject[PATCH] change cpuacct usage percpu format
    I'd like to change cpuacct.usage_percpu format before it's widely used.
    Current format is not easy to use in hardware with DR feature.

    cpuacct.usage_percpu shows per cpu usage information via cgroupfs.
    It shows all present cpus information and "whose information ?"
    is explained just by index of data implicitly.

    IIRC, there is physical cpu hotplug and it can remove
    cpus and change present map. Considering a software which records
    this information pediodically(like sar.), its better to show id of cpu
    in explict way.

    Signed-off-by: KAMEZAWA Hiroyuki <>
    kernel/sched.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    Index: mmotm-2.6.29-Feb24/kernel/sched.c
    --- mmotm-2.6.29-Feb24.orig/kernel/sched.c
    +++ mmotm-2.6.29-Feb24/kernel/sched.c
    @@ -9719,7 +9719,7 @@ static int cpuacct_percpu_seq_read(struc

    for_each_present_cpu(i) {
    percpu = cpuacct_cpuusage_read(ca, i);
    - seq_printf(m, "%llu ", (unsigned long long) percpu);
    + seq_printf(m, "%d %llu\n", i, (unsigned long long) percpu);
    seq_printf(m, "\n");
    return 0;

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      Last update: 2009-02-27 06:09    [W:0.022 / U:2.220 seconds]
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