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tracing: Call on_each_cpu() when adding or removing single pids from set_event_pid 

For the case where pids are already in set_event_pid, and one is added or
removed then each CPU should be checked to make sure that the new or old pid
is on or not on a CPU.

 For example:

 # echo 123 >> set_event_pid

or

 # echo '!123' >> set_event_pid

Link: http://lkml.kernel.org/r/20151030061643.GA19480@cac

Suggested-by: Jiaxing Wang <hello.wjx@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-11-02 13:08:26 -05:00 committed by Steven Rostedt
parent fb66228828
commit 799fd44cf5
1 changed files with 7 additions and 6 deletions
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13
kernel/trace/trace_events.c
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@ -1729,14 +1729,15 @@ 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);
}
/*
* Ignoring of pids is done at task switch. But we have to
* check for those tasks that are currently running.
* Always do this in case a pid was appended or removed.
*/
on_each_cpu(ignore_task_cpu, tr, 1);
mutex_unlock(&event_mutex);
ret = read;