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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_events.c | |
| parent | ftrace: Make function trace pid filtering a bit more exact (diff) | |
| download | linux-dev-b3b1e6ededa4337940adba6cf06e8351056e3097.tar.xz linux-dev-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_events.c')
| -rw-r--r-- | kernel/trace/trace_events.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index f38234ecea18..c196d0dc5871 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -549,8 +549,8 @@ event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, pid_list = rcu_dereference_sched(tr->filtered_pids); this_cpu_write(tr->array_buffer.data->ignore_pid, - trace_ignore_this_task(pid_list, prev) && - trace_ignore_this_task(pid_list, next)); + trace_ignore_this_task(pid_list, NULL, prev) && + trace_ignore_this_task(pid_list, NULL, next)); } static void @@ -563,7 +563,7 @@ event_filter_pid_sched_switch_probe_post(void *data, bool preempt, pid_list = rcu_dereference_sched(tr->filtered_pids); this_cpu_write(tr->array_buffer.data->ignore_pid, - trace_ignore_this_task(pid_list, next)); + trace_ignore_this_task(pid_list, NULL, next)); } static void @@ -579,7 +579,7 @@ event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) pid_list = rcu_dereference_sched(tr->filtered_pids); this_cpu_write(tr->array_buffer.data->ignore_pid, - trace_ignore_this_task(pid_list, task)); + trace_ignore_this_task(pid_list, NULL, task)); } static void @@ -596,7 +596,7 @@ event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) /* Set tracing if current is enabled */ this_cpu_write(tr->array_buffer.data->ignore_pid, - trace_ignore_this_task(pid_list, current)); + trace_ignore_this_task(pid_list, NULL, current)); } static void __ftrace_clear_event_pids(struct trace_array *tr) @@ -1597,7 +1597,7 @@ static void ignore_task_cpu(void *data) mutex_is_locked(&event_mutex)); this_cpu_write(tr->array_buffer.data->ignore_pid, - trace_ignore_this_task(pid_list, current)); + trace_ignore_this_task(pid_list, NULL, current)); } static ssize_t |