[PATCH v4 07/13] scripts/gdb: Add task iteration helper

Jan Kiszka
2013-01-21T17:12:08Z

The internal helper for_each_task iterates over all tasks of the target,
calling the provided function on each. For performance reasons, we cache
a reference to the gdb type object of a task.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
scripts/gdb/task.py | 40 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 40 insertions(+), 0 deletions(-)
create mode 100644 scripts/gdb/task.py

diff --git a/scripts/gdb/task.py b/scripts/gdb/task.py
new file mode 100644
index 0000000..ff05aa5
--- /dev/null
+++ b/scripts/gdb/task.py
@@ -0,0 +1,40 @@
+#
+# gdb helper commands and functions for Linux kernel debugging
+#
+# task & thread tools
+#
+# Copyright (c) Siemens AG, 2011, 2012
+#
+# Authors:
+# Jan Kiszka <jan.kiszka@siemens.com>
+#
+# This work is licensed under the terms of the GNU GPL version 2.
+#
+
+import gdb
+
+from utils import *
+
+task_ptr_type = None
+
+def get_task_ptr_type():
+ global task_ptr_type
+ if task_ptr_type == None:
+ task_ptr_type = get_type("struct task_struct").pointer()
+ return task_ptr_type
+
+def for_each_task(func, arg = None):
+ init_task = gdb.parse_and_eval("init_task")
+ g = init_task.address
+ while True:
+ g = container_of(g['tasks']['next'], get_task_ptr_type(),
+ "tasks")
+ if g == init_task.address:
+ break;
+ t = g
+ while True:
+ func(t, arg)
+ t = container_of(t['thread_group']['next'],
+ get_task_ptr_type(), "thread_group")
+ if t == g:
+ break
--
1.7.3.4