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[LMB] Add lmb_alloc_nid()

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A variant of lmb_alloc() that tries to allocate memory on a specified
NUMA node 'nid' but falls back to normal lmb_alloc() if that fails.

The caller provides a 'nid_range' function pointer which assists the
allocator.  It is given args 'start', 'end', and pointer to integer
'this_nid'.

It places at 'this_nid' the NUMA node id that corresponds to 'start',
and returns the end address within 'start' to 'end' at which memory
assosciated with 'nid' ends.

This callback allows a platform to use lmb_alloc_nid() in just
about any context, even ones in which early_pfn_to_nid() might
not be working yet.

This function will be used by the NUMA setup code on sparc64, and also
it can be used by powerpc, replacing it's hand crafted
"careful_allocation()" function in arch/powerpc/mm/numa.c

If x86 ever converts it's NUMA support over to using the LMB helpers,
it can use this too as it has something entirely similar.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
David S. Miller
2008-03-24 20:50:48 +11:00
committed by Paul Mackerras
parent 4b1d99b37f
commit c50f68c8ae
2 changed files with 78 additions and 10 deletions
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2
include/linux/lmb.h
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@@ -42,6 +42,8 @@ extern void __init lmb_init(void);
extern void __init lmb_analyze(void);
extern long __init lmb_add(u64 base, u64 size);
extern long __init lmb_reserve(u64 base, u64 size);
extern u64 __init lmb_alloc_nid(u64 size, u64 align, int nid,
u64 (*nid_range)(u64, u64, int *));
extern u64 __init lmb_alloc(u64 size, u64 align);
extern u64 __init lmb_alloc_base(u64 size,
u64, u64 max_addr);