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slub: Make cpu partial slab support configurable

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CPU partial support can introduce level of indeterminism that is not
wanted in certain context (like a realtime kernel). Make it
configurable.

This patch is based on Christoph Lameter's "slub: Make cpu partial slab
support configurable V2".

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Joonsoo Kim
2013-06-19 14:05:52 +09:00
committed by Pekka Enberg
parent e7efa615cc
commit 345c905d13
2 changed files with 32 additions and 6 deletions
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11
init/Kconfig
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@@ -1511,6 +1511,17 @@ config SLOB
endchoice
config SLUB_CPU_PARTIAL
default y
depends on SLUB
bool "SLUB per cpu partial cache"
help
Per cpu partial caches accellerate objects allocation and freeing
that is local to a processor at the price of more indeterminism
in the latency of the free. On overflow these caches will be cleared
which requires the taking of locks that may cause latency spikes.
Typically one would choose no for a realtime system.
config MMAP_ALLOW_UNINITIALIZED
bool "Allow mmapped anonymous memory to be uninitialized"
depends on EXPERT && !MMU