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slub: No need for per node slab counters if !SLUB_DEBUG

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The per node counters are used mainly for showing data through the sysfs API.
If that API is not compiled in then there is no point in keeping track of this
data. Disable counters for the number of slabs and the number of total slabs
if !SLUB_DEBUG. Incrementing the per node counters is also accessing a
potentially contended cacheline so this could actually be a performance
benefit to embedded systems.

SLABINFO support is also affected. It now must depends on SLUB_DEBUG (which
is on by default).

Patch also avoids a check for a NULL kmem_cache_node pointer in new_slab()
if the system is not compiled with NUMA support.

[penberg@cs.helsinki.fi: fix oops and move ->nr_slabs into CONFIG_SLUB_DEBUG]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Christoph Lameter
2008-04-14 18:53:02 +03:00
committed by Pekka Enberg
parent 49bd5221ce
commit 0f389ec630
3 changed files with 42 additions and 13 deletions
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2
init/Kconfig
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@@ -763,7 +763,7 @@ endmenu # General setup
config SLABINFO
bool
depends on PROC_FS
depends on SLAB || SLUB
depends on SLAB || SLUB_DEBUG
default y
config RT_MUTEXES