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slob: implement RCU freeing

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The SLOB allocator should implement SLAB_DESTROY_BY_RCU correctly, because
even on UP, RCU freeing semantics are not equivalent to simply freeing
immediately.  This also allows SLOB to be used on SMP.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin
2007-05-16 22:10:49 -07:00
committed by Linus Torvalds
parent b2cd64153b
commit afc0cedbe9
2 changed files with 47 additions and 12 deletions
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init/Kconfig
+2 -5
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@@ -577,14 +577,11 @@ config SLUB
and has enhanced diagnostics.
config SLOB
#
# SLOB does not support SMP because SLAB_DESTROY_BY_RCU is unsupported
#
depends on EMBEDDED && !SMP && !SPARSEMEM
depends on EMBEDDED && !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
allocator. SLOB is more space efficient than SLAB but does not
scale well (single lock for all operations) and is also highly
susceptible to fragmentation. SLUB can accomplish a higher object
density. It is usually better to use SLUB instead of SLOB.