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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2015-11-02 13:08:26 -0500
committerSteven Rostedt <rostedt@goodmis.org>2015-11-02 13:08:26 -0500
commit799fd44cf5bbcc51c46b674035bfc49cbf6907ba (patch)
treebdca4e60b2c7a6daeeef55bd1e473b1797d8a802 /kernel/trace
parentfb662288284e8f2ec26f13d50a6b0d5781771648 (diff)
downloadlinux-799fd44cf5bbcc51c46b674035bfc49cbf6907ba.tar.bz2
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>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_events.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index fb0261e90acc..292bccf3e011 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -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;