diff options
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 5e634b9c1e0a..6519b7afc499 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -386,16 +386,22 @@ trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid) * Returns false if @task should be traced. */ bool -trace_ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task) +trace_ignore_this_task(struct trace_pid_list *filtered_pids, + struct trace_pid_list *filtered_no_pids, + struct task_struct *task) { /* - * Return false, because if filtered_pids does not exist, - * all pids are good to trace. + * If filterd_no_pids is not empty, and the task's pid is listed + * in filtered_no_pids, then return true. + * Otherwise, if filtered_pids is empty, that means we can + * trace all tasks. If it has content, then only trace pids + * within filtered_pids. */ - if (!filtered_pids) - return false; - return !trace_find_filtered_pid(filtered_pids, task->pid); + return (filtered_pids && + !trace_find_filtered_pid(filtered_pids, task->pid)) || + (filtered_no_pids && + trace_find_filtered_pid(filtered_no_pids, task->pid)); } /** @@ -5013,6 +5019,8 @@ static const char readme_msg[] = #ifdef CONFIG_FUNCTION_TRACER " set_ftrace_pid\t- Write pid(s) to only function trace those pids\n" "\t\t (function)\n" + " set_ftrace_notrace_pid\t- Write pid(s) to not function trace those pids\n" + "\t\t (function)\n" #endif #ifdef CONFIG_FUNCTION_GRAPH_TRACER " set_graph_function\t- Trace the nested calls of a function (function_graph)\n" |