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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 /arch/x86/kernel/setup_percpu.c | |
| parent | ce3141a277ff6cc37e51008b8888dc2cb7456ef1 (diff) | |
| download | kernel_samsung_espresso10-2f39e637ea240efb74cf807d31c93a71a0b89174.zip kernel_samsung_espresso10-2f39e637ea240efb74cf807d31c93a71a0b89174.tar.gz kernel_samsung_espresso10-2f39e637ea240efb74cf807d31c93a71a0b89174.tar.bz2 | |
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 'arch/x86/kernel/setup_percpu.c')
0 files changed, 0 insertions, 0 deletions