linux-kernel - [PATCH v5 11/20] scripts/gdb: Add task iteration helper

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Message-Id: <05a9f93b3ea301f67c87dd7a69b32d5bf69a81e7.1359463075.git.jan.kiszka@siemens.com>
Date:	Tue, 29 Jan 2013 13:37:54 +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>, Borislav Petkov <bp@...en8.de>
Subject: [PATCH v5 11/20] 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.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/task.py |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 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..6b73dbf
--- /dev/null
+++ b/scripts/gdb/task.py
@@ -0,0 +1,35 @@
+#
+# gdb helper commands and functions for Linux kernel debugging
+#
+#  task & thread tools
+#
+# Copyright (c) Siemens AG, 2011-2013
+#
+# 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_type = CachedType("struct task_struct")
+
+def for_each_task(func, arg = None):
+	global task_type
+	task_ptr_type = task_type.get_type().pointer()
+	init_task = gdb.parse_and_eval("init_task")
+	g = init_task.address
+	while True:
+		g =  container_of(g['tasks']['next'], task_ptr_type, "tasks")
+		if g == init_task.address:
+			break;
+		t = g
+		while True:
+			func(t, arg)
+			t = container_of(t['thread_group']['next'],
+					 task_ptr_type, "thread_group")
+			if t == g:
+				break
-- 
1.7.3.4

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