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

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Message-Id: <150b6a984796b0cdf5dd3dda0e7373edd8fdb996.1358787929.git.jan.kiszka@siemens.com>
Date:	Mon, 21 Jan 2013 18:06:14 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>, Ben Widawsky <ben@...dawsk.net>
Subject: [PATCH v4 07/13] scripts/gdb: Add task iteration helper

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@...mens.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@...mens.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

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