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| author | Ingo Molnar <mingo@elte.hu> | 2006-07-10 04:44:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-10 13:24:14 -0700 |
| commit | d6d897cec29252b8d0785198cfa6ca16d30c739d (patch) | |
| tree | 01b138b10c7afa0e88e9720be3d3616e4f0bccc1 /include | |
| parent | 55794a412fdf9af1744800e5020a4ec6b21e3cdc (diff) | |
| download | op-kernel-dev-d6d897cec29252b8d0785198cfa6ca16d30c739d.zip op-kernel-dev-d6d897cec29252b8d0785198cfa6ca16d30c739d.tar.gz | |
[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')
| -rw-r--r-- | include/linux/lockdep.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 316e0fb..c040a8c 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; }; |
