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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2020-03-19 23:19:06 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-03-27 16:39:02 -0400
commitb3b1e6ededa4337940adba6cf06e8351056e3097 (patch)
treed316c05b89cf064f9221aaac8afb0c9b259f6e8a /kernel/trace/trace_events.c
parent717e3f5ebc823e5ecfdd15155b0fd81af9fc58d6 (diff)
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.c12
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