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    SubjectRe: [for-next][PATCH 4/5] tracing: Check all tasks on each CPU when filtering pids
    On Thu, Oct 29, 2015 at 03:07:58AM -0400, Steven Rostedt wrote:
    > static ssize_t
    > ftrace_event_pid_write(struct file *filp, const char __user *ubuf,
    > size_t cnt, loff_t *ppos)
    > @@ -1711,6 +1727,12 @@ ftrace_event_pid_write(struct file *filp, const char __user *ubuf,
    > tr, INT_MAX);
    > register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post,
    > tr, 0);
    > +
    > + /*
    > + * Ignoring of pids is done at task switch. But we have to
    > + * check for those tasks that are currently running.
    > + */
    > + on_each_cpu(ignore_task_cpu, tr, 1);
    > }
    on_each_cpu(ignore_task_cpu, tr, 1); can be put outside of the else
    block, then ignore_pid can be updated when appending pid,
    eg. echo 'xxx' >> set_event_pid, in case xxx is running on some cpu.
    >
    > mutex_unlock(&event_mutex);


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