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percpu: reduce PCPU_MIN_UNIT_SIZE to 32k 

In preparation of enabling percpu allocator for UP, reduce
PCPU_MIN_UNIT_SIZE to 32k.  On UP, the first chunk doesn't have to
include static percpu variables and chunk size can be smaller which is
important as UP percpu allocator will use contiguous kernel memory to
populate chunks.

PCPU_MIN_UNIT_SIZE also determines the maximum supported allocation
size but 32k should still be enough.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Christoph Lameter <cl@linux.com>
This commit is contained in:
Tejun Heo 2010-09-03 18:22:47 +02:00
parent 4f8b02b4e5
commit 6abad5acac
1 changed files with 1 additions and 1 deletions
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2
include/linux/percpu.h
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@ -42,7 +42,7 @@
#ifdef CONFIG_SMP
/* minimum unit size, also is the maximum supported allocation size */
#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(64 << 10)
#define PCPU_MIN_UNIT_SIZE PFN_ALIGN(32 << 10)
/*
* Percpu allocator can serve percpu allocations before slab is