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authorIngo Molnar <mingo@elte.hu>2006-07-10 04:44:04 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-10 13:24:14 -0700
commitd6d897cec29252b8d0785198cfa6ca16d30c739d (patch)
tree01b138b10c7afa0e88e9720be3d3616e4f0bccc1 /include/linux
parent55794a412fdf9af1744800e5020a4ec6b21e3cdc (diff)
[PATCH] lockdep: core, reduce per-lock class-cache size
lockdep_map is embedded into every lock, which blows up data structure sizes all around the kernel. Reduce the class-cache to be for the default class only - that is used in 99.9% of the cases and even if we dont have a class cached, the lookup in the class-hash is lockless. This change reduces the per-lock dep_map overhead by 56 bytes on 64-bit platforms and by 28 bytes on 32-bit platforms. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/lockdep.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 316e0fb8d7b..c040a8c969a 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -120,7 +120,7 @@ struct lock_class {
*/
struct lockdep_map {
struct lock_class_key *key;
- struct lock_class *class[MAX_LOCKDEP_SUBCLASSES];
+ struct lock_class *class_cache;
const char *name;
};