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percpu: allow non-linear / sparse cpu -> unit mapping

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Currently cpu and unit are always identity mapped.  To allow more
efficient large page support on NUMA and lazy allocation for possible
but offline cpus, cpu -> unit mapping needs to be non-linear and/or
sparse.  This can be easily implemented by adding a cpu -> unit
mapping array and using it whenever looking up the matching unit for a
cpu.

The only unusal conversion is in pcpu_chunk_addr_search().  The passed
in address is unit0 based and unit0 might not be in use so it needs to
be converted to address of an in-use unit.  This is easily done by
adding the unit offset for the current processor.

[ Impact: allows non-linear/sparse cpu -> unit mapping, no visible change yet ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Miller <davem@davemloft.net>
This commit is contained in:
Tejun Heo
2009-07-04 08:11:00 +09:00
parent ce3141a277
commit 2f39e637ea
3 changed files with 97 additions and 37 deletions
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3
include/linux/percpu.h
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@@ -57,6 +57,7 @@
#endif
extern void *pcpu_base_addr;
extern const int *pcpu_unit_map;
typedef void * (*pcpu_fc_alloc_fn_t)(unsigned int cpu, size_t size);
typedef void (*pcpu_fc_free_fn_t)(void *ptr, size_t size);
@@ -66,7 +67,7 @@ typedef void (*pcpu_fc_map_fn_t)(void *ptr, size_t size, void *addr);
extern size_t __init pcpu_setup_first_chunk(
size_t static_size, size_t reserved_size,
ssize_t dyn_size, size_t unit_size,
void *base_addr);
void *base_addr, const int *unit_map);
extern ssize_t __init pcpu_embed_first_chunk(
size_t static_size, size_t reserved_size,