scripts/gdb: add helper and convenience function to look up tasks
Add the helper task_by_pid that can look up a task by its PID. Also
export it as a convenience function.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/gdb/linux/tasks.py b/scripts/gdb/linux/tasks.py
index cd25984..13bb97c 100644
--- a/scripts/gdb/linux/tasks.py
+++ b/scripts/gdb/linux/tasks.py
@@ -44,3 +44,30 @@
utils.container_of(t['thread_group']['next'],
self.task_ptr_type, "thread_group")
return t
+
+
+def get_task_by_pid(pid):
+ for task in TaskList():
+ if int(task['pid']) == pid:
+ return task
+ return None
+
+
+class LxTaskByPidFunc(gdb.Function):
+ """Find Linux task by PID and return the task_struct variable.
+
+$lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and
+return that task_struct variable which PID matches."""
+
+ def __init__(self):
+ super(LxTaskByPidFunc, self).__init__("lx_task_by_pid")
+
+ def invoke(self, pid):
+ task = get_task_by_pid(pid)
+ if task:
+ return task.dereference()
+ else:
+ raise gdb.GdbError("No task of PID " + str(pid))
+
+
+LxTaskByPidFunc()
diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py
index fa66d23..4d7eb2c 100644
--- a/scripts/gdb/vmlinux-gdb.py
+++ b/scripts/gdb/vmlinux-gdb.py
@@ -26,3 +26,4 @@
import linux.symbols
import linux.modules
import linux.dmesg
+ import linux.tasks