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| author | Tejun Heo <tj@kernel.org> | 2009-07-04 08:11:00 +0900 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2009-07-04 08:11:00 +0900 |
| commit | 2f39e637ea240efb74cf807d31c93a71a0b89174 (patch) | |
| tree | d26bd3ad962031c5b495a528b4115c2ed4ff7a80 /include | |
| parent | ce3141a277ff6cc37e51008b8888dc2cb7456ef1 (diff) | |
| download | linux-2f39e637ea240efb74cf807d31c93a71a0b89174.tar.gz linux-2f39e637ea240efb74cf807d31c93a71a0b89174.tar.bz2 linux-2f39e637ea240efb74cf807d31c93a71a0b89174.zip | |
percpu: allow non-linear / sparse cpu -> unit mapping
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/percpu.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 63c8b7a23e66..1e0e8878dc2a 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -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, |