ftrace: Create set_ftrace_notrace_pid to not trace tasks

Browse source

There's currently a way to select a task that should only be traced by
functions, but there's no way to select a task not to be traced by the
function tracer. Add a set_ftrace_notrace_pid file that acts the same as
set_ftrace_pid (and is also affected by function-fork), but the task pids in
this file will not be traced even if they are listed in the set_ftrace_pid
file. This makes it easy for tools like trace-cmd to "hide" itself from the
function tracer when it is recording other tasks.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

...

This commit is contained in:

Steven Rostedt (VMware) 2020-03-19 23:19:06 -04:00

parent 717e3f5ebc

commit b3b1e6eded

4 changed files with 180 additions and 35 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

181

kernel/trace/ftrace.c

View file

20

kernel/trace/trace.c

View file

2

kernel/trace/trace.h

View file

12

kernel/trace/trace_events.c

View file