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[PATCH] lockdep: core, reduce per-lock class-cache size

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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>
This commit is contained in:
Ingo Molnar 2006-07-10 04:44:04 -07:00 • committed by Linus Torvalds
parent 55794a412f
commit d6d897cec2
2 changed files with 55 additions and 34 deletions
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2
include/linux/lockdep.h
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@ -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;
};