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| author |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-03-19 23:19:06 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-03-27 16:39:02 -0400 |
| commit | b3b1e6ededa4337940adba6cf06e8351056e3097 (patch) | |
| tree | d316c05b89cf064f9221aaac8afb0c9b259f6e8a /kernel/trace/trace.h | |
| parent | ftrace: Make function trace pid filtering a bit more exact (diff) | |
| download | wireguard-linux-b3b1e6ededa4337940adba6cf06e8351056e3097.tar.xz wireguard-linux-b3b1e6ededa4337940adba6cf06e8351056e3097.zip | |
ftrace: Create set_ftrace_notrace_pid to not trace tasks
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>
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 fdc72f5f0bb0..6b5ff5adb4ad 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -331,6 +331,7 @@ struct trace_array { #ifdef CONFIG_FUNCTION_TRACER struct ftrace_ops *ops; struct trace_pid_list __rcu *function_pids; + struct trace_pid_list __rcu *function_no_pids; #ifdef CONFIG_DYNAMIC_FTRACE /* All of these are protected by the ftrace_lock */ struct list_head func_probes; @@ -782,6 +783,7 @@ extern int pid_max; bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid); bool trace_ignore_this_task(struct trace_pid_list *filtered_pids, + struct trace_pid_list *filtered_no_pids, struct task_struct *task); void trace_filter_add_remove_task(struct trace_pid_list *pid_list, struct task_struct *self, |