path: root/init/Kconfig
diff options
Diffstat (limited to 'init/Kconfig')
1 files changed, 40 insertions, 13 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 29d9e47ee0da..7ce952052947 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -478,15 +478,6 @@ config SHMEM
option replaces shmem and tmpfs with the much simpler ramfs code,
which may be appropriate on small systems without swap.
-config SLAB
- default y
- bool "Use full SLAB allocator" if (EMBEDDED && !SMP && !SPARSEMEM)
- help
- Disabling this replaces the advanced SLAB allocator and
- kmalloc support with the drastically simpler SLOB allocator.
- SLOB is more space efficient but does not scale well and is
- more susceptible to fragmentation.
default y
bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
@@ -496,6 +487,46 @@ config VM_EVENT_COUNTERS
on EMBEDDED systems. /proc/vmstat will only show page counts
if VM event counters are disabled.
+ prompt "Choose SLAB allocator"
+ default SLAB
+ help
+ This option allows to select a slab allocator.
+config SLAB
+ bool "SLAB"
+ help
+ The regular slab allocator that is established and known to work
+ well in all environments. It organizes chache hot objects in
+ per cpu and per node queues. SLAB is the default choice for
+ slab allocator.
+config SLUB
+ bool "SLUB (Unqueued Allocator)"
+ help
+ SLUB is a slab allocator that minimizes cache line usage
+ instead of managing queues of cached objects (SLAB approach).
+ Per cpu caching is realized using slabs of objects instead
+ of queues of objects. SLUB can use memory efficiently
+ way and has enhanced diagnostics.
+config SLOB
+# SLOB cannot support SMP because SLAB_DESTROY_BY_RCU does not work
+# properly.
+ depends on EMBEDDED && !SMP && !SPARSEMEM
+ bool "SLOB (Simple Allocator)"
+ help
+ SLOB replaces the SLAB allocator with a drastically simpler
+ allocator. SLOB is more space efficient that SLAB but does not
+ scale well (single lock for all operations) and is more susceptible
+ to fragmentation. SLOB it is a great choice to reduce
+ memory usage and code size for embedded systems.
endmenu # General setup
@@ -511,10 +542,6 @@ config BASE_SMALL
default 0 if BASE_FULL
default 1 if !BASE_FULL
-config SLOB
- default !SLAB
- bool
menu "Loadable module support"
config MODULES