lkml.org 
[lkml]   [2011]   [Sep]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[RFD 5/9] per-cgroup boot time
    Date
    Record the time in which the cgroup was created. This can be
    used to provide a more accurate boottime information in
    cpuacct.proc.stat.

    Signed-off-by: Glauber Costa <glommer@parallels.com>
    ---
    kernel/sched.c | 5 +++++
    1 files changed, 5 insertions(+), 0 deletions(-)

    diff --git a/kernel/sched.c b/kernel/sched.c
    index 9c6e44e..7612410 100644
    --- a/kernel/sched.c
    +++ b/kernel/sched.c
    @@ -280,6 +280,7 @@ struct task_group {
    #endif
    unsigned long total_forks;
    struct kernel_stat __percpu *cpustat;
    + struct timespec start_time;
    };

    /* task_group_lock serializes the addition/removal of task groups */
    @@ -8141,6 +8142,7 @@ void __init sched_init(void)
    INIT_LIST_HEAD(&root_task_group.siblings);
    autogroup_init(&init_task);

    + root_task_group.start_time = (struct timespec){0, 0};
    root_task_group.cpustat = alloc_percpu(struct kernel_stat);
    /* Failing that early an allocation means we're screwed anyway */
    BUG_ON(!root_task_group.cpustat);
    @@ -8619,6 +8621,8 @@ struct task_group *sched_create_group(struct task_group *parent)
    kstat->cpustat[IOWAIT_BASE] = root_kstat->cpustat[IOWAIT];
    }

    + get_monotonic_boottime(&tg->start_time);
    +
    spin_lock_irqsave(&task_group_lock, flags);
    list_add_rcu(&tg->list, &task_groups);

    @@ -9154,6 +9158,7 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft, struct seq_fil
    irq = softirq = steal = cputime64_zero;
    guest = guest_nice = cputime64_zero;
    getboottime(&boottime);
    + boottime = timespec_add(boottime, tg->start_time);
    jif = boottime.tv_sec;

    for_each_possible_cpu(i) {
    --
    1.7.6


    \
     
     \ /
      Last update: 2011-09-24 00:27    [W:0.042 / U:119.648 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site