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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
View File

@ -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);

86
lib/lmb.c
View File

@ -232,6 +232,82 @@ long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base,
return (i < rgn->cnt) ? i : -1;
}
static u64 lmb_align_down(u64 addr, u64 size)
{
return addr & ~(size - 1);
}
static u64 lmb_align_up(u64 addr, u64 size)
{
return (addr + (size - 1)) & ~(size - 1);
}
static u64 __init lmb_alloc_nid_unreserved(u64 start, u64 end,
u64 size, u64 align)
{
u64 base;
long j;
base = lmb_align_down((end - size), align);
while (start <= base &&
((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0))
base = lmb_align_down(lmb.reserved.region[j].base - size,
align);
if (base != 0 && start <= base) {
if (lmb_add_region(&lmb.reserved, base,
lmb_align_up(size, align)) < 0)
base = ~(u64)0;
return base;
}
return ~(u64)0;
}
static u64 __init lmb_alloc_nid_region(struct lmb_property *mp,
u64 (*nid_range)(u64, u64, int *),
u64 size, u64 align, int nid)
{
u64 start, end;
start = mp->base;
end = start + mp->size;
start = lmb_align_up(start, align);
while (start < end) {
u64 this_end;
int this_nid;
this_end = nid_range(start, end, &this_nid);
if (this_nid == nid) {
u64 ret = lmb_alloc_nid_unreserved(start, this_end,
size, align);
if (ret != ~(u64)0)
return ret;
}
start = this_end;
}
return ~(u64)0;
}
u64 __init lmb_alloc_nid(u64 size, u64 align, int nid,
u64 (*nid_range)(u64 start, u64 end, int *nid))
{
struct lmb_region *mem = &lmb.memory;
int i;
for (i = 0; i < mem->cnt; i++) {
u64 ret = lmb_alloc_nid_region(&mem->region[i],
nid_range,
size, align, nid);
if (ret != ~(u64)0)
return ret;
}
return lmb_alloc(size, align);
}
u64 __init lmb_alloc(u64 size, u64 align)
{
return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
@ -250,16 +326,6 @@ u64 __init lmb_alloc_base(u64 size, u64 align, u64 max_addr)
return alloc;
}
static u64 lmb_align_down(u64 addr, u64 size)
{
return addr & ~(size - 1);
}
static u64 lmb_align_up(u64 addr, u64 size)
{
return (addr + (size - 1)) & ~(size - 1);
}
u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr)
{
long i, j;