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percpu: generalize first chunk allocator selection

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Now that all first chunk allocators are in mm/percpu.c, it makes sense
to make generalize percpu_alloc kernel parameter.  Define PCPU_FC_*
and set pcpu_chosen_fc using early_param() in mm/percpu.c.  Arch code
can use the set value to determine which first chunk allocator to use.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2009-08-14 15:00:50 +09:00
parent 08fc458061
commit f58dc01ba2
4 changed files with 56 additions and 23 deletions
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11
Documentation/kernel-parameters.txt
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@@ -1919,11 +1919,12 @@ and is between 256 and 4096 characters. It is defined in the file
Format: { 0 | 1 }
See arch/parisc/kernel/pdc_chassis.c
percpu_alloc= [X86] Select which percpu first chunk allocator to use.
Allowed values are one of "lpage", "embed" and "page".
See comments in arch/x86/kernel/setup_percpu.c for
details on each allocator. This parameter is primarily
for debugging and performance comparison.
percpu_alloc= Select which percpu first chunk allocator to use.
Currently supported values are "embed", "page" and
"lpage". Archs may support subset or none of the
selections. See comments in mm/percpu.c for details
on each allocator. This parameter is primarily for
debugging and performance comparison.
pf. [PARIDE]
See Documentation/blockdev/paride.txt.