[PATCH] lockdep: core, reduce per-lock class-cache size
commitd6d897cec29252b8d0785198cfa6ca16d30c739d
authorIngo Molnar <mingo@elte.hu>
Mon, 10 Jul 2006 11:44:04 +0000 (10 04:44 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Mon, 10 Jul 2006 20:24:14 +0000 (10 13:24 -0700)
tree01b138b10c7afa0e88e9720be3d3616e4f0bccc1
parent55794a412fdf9af1744800e5020a4ec6b21e3cdc
[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>
include/linux/lockdep.h
kernel/lockdep.c