From: Ingo Molnar <mingo@elte.hu>
Date: Mon, 10 Jul 2006 11:44:04 +0000 (-0700)
Subject: [PATCH] lockdep: core, reduce per-lock class-cache size
X-Git-Tag: v2.6.18-rc2~236
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6d897cec29252b8d0785198cfa6ca16d30c739d;p=pandora-kernel.git

[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>
---

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