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| author |   Steven Rostedt <rostedt@goodmis.org> | 2016-04-13 16:59:18 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-04-19 10:28:28 -0400 |
| commit | c37775d57830a36382a9774bb84eca4ce3d019cc (patch) | |
| tree | 460e9b501ee496689da8ecb84290b7f2d32c91e6 /kernel/trace/trace.h | |
| parent | tracing: Use pid bitmap instead of a pid array for set_event_pid (diff) | |
| download | linux-dev-c37775d57830a36382a9774bb84eca4ce3d019cc.tar.xz linux-dev-c37775d57830a36382a9774bb84eca4ce3d019cc.zip | |
tracing: Add infrastructure to allow set_event_pid to follow children
Add the infrastructure needed to have the PIDs in set_event_pid to
automatically add PIDs of the children of the tasks that have their PIDs in
set_event_pid. This will also remove PIDs from set_event_pid when a task
exits
This is implemented by adding hooks into the fork and exit tracepoints. On
fork, the PIDs are added to the list, and on exit, they are removed.
Add a new option called event_fork that when set, PIDs in set_event_pid will
automatically get their children PIDs added when they fork, as well as any
task that exits will have its PID removed from set_event_pid.
This works for instances as well.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 68cbb8e10aea..2525042760e6 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -655,6 +655,7 @@ static inline void __trace_stack(struct trace_array *tr, unsigned long flags, extern cycle_t ftrace_now(int cpu); extern void trace_find_cmdline(int pid, char comm[]); +extern void trace_event_follow_fork(struct trace_array *tr, bool enable); #ifdef CONFIG_DYNAMIC_FTRACE extern unsigned long ftrace_update_tot_cnt; @@ -966,6 +967,7 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf, C(STOP_ON_FREE, "disable_on_free"), \ C(IRQ_INFO, "irq-info"), \ C(MARKERS, "markers"), \ + C(EVENT_FORK, "event-fork"), \ FUNCTION_FLAGS \ FGRAPH_FLAGS \ STACK_FLAGS \ |