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authorJan Kiszka <jan.kiszka@siemens.com>2015-02-17 13:46:38 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-17 14:34:53 -0800
commit2b514827ef06fd69e1739e7f367712619dee7784 (patch)
treec222ab179c1a2af790106882f1b560d417281891
parentscripts/gdb: add infrastructure (diff)
downloadlinux-dev-2b514827ef06fd69e1739e7f367712619dee7784.tar.xz
linux-dev-2b514827ef06fd69e1739e7f367712619dee7784.zip
scripts/gdb: add cache for type objects
Type lookups are very slow in gdb-python which is often noticeable when iterating over a number of objects. Introduce the helper class CachedType that keeps a reference to a gdb.Type object but also refreshes it after an object file has been loaded. 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>
-rw-r--r--scripts/gdb/linux/utils.py34
1 files changed, 34 insertions, 0 deletions
diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py
new file mode 100644
index 000000000000..f88361130e4c
--- /dev/null
+++ b/scripts/gdb/linux/utils.py
@@ -0,0 +1,34 @@
+#
+# gdb helper commands and functions for Linux kernel debugging
+#
+# common utilities
+#
+# Copyright (c) Siemens AG, 2011-2013
+#
+# Authors:
+# Jan Kiszka <jan.kiszka@siemens.com>
+#
+# This work is licensed under the terms of the GNU GPL version 2.
+#
+
+import gdb
+
+
+class CachedType:
+ def __init__(self, name):
+ self._type = None
+ self._name = name
+
+ def _new_objfile_handler(self, event):
+ self._type = None
+ gdb.events.new_objfile.disconnect(self._new_objfile_handler)
+
+ def get_type(self):
+ if self._type is None:
+ self._type = gdb.lookup_type(self._name)
+ if self._type is None:
+ raise gdb.GdbError(
+ "cannot resolve type '{0}'".format(self._name))
+ if hasattr(gdb, 'events') and hasattr(gdb.events, 'new_objfile'):
+ gdb.events.new_objfile.connect(self._new_objfile_handler)
+ return self._type