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hugetlb: support boot allocate different sizes 

Make some infrastructure changes to allow boot-time allocation of
different hugepage page sizes.

- move all basic hstate initialisation into hugetlb_add_hstate
- create a new function hugetlb_hstate_alloc_pages() to do the
  actual initial page allocations. Call this function early in
  order to allocate giant pages from bootmem.
- Check for multiple hugepages= parameters

Acked-by: Adam Litke <agl@us.ibm.com>
Acked-by: Nishanth Aravamudan <nacc@us.ibm.com>
Acked-by: Andrew Hastings <abh@cray.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen 2008-07-23 21:27:48 -07:00 committed by Linus Torvalds
parent aa888a7497
commit 8faa8b077b
1 changed files with 30 additions and 9 deletions
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39
mm/hugetlb.c
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@ -981,15 +981,10 @@ static void __init gather_bootmem_prealloc(void)
}
}
static void __init hugetlb_init_one_hstate(struct hstate *h)
static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
{
unsigned long i;
for (i = 0; i < MAX_NUMNODES; ++i)
INIT_LIST_HEAD(&h->hugepage_freelists[i]);
h->hugetlb_next_nid = first_node(node_online_map);
for (i = 0; i < h->max_huge_pages; ++i) {
if (h->order >= MAX_ORDER) {
if (!alloc_bootmem_huge_page(h))
@ -997,7 +992,7 @@ static void __init hugetlb_init_one_hstate(struct hstate *h)
} else if (!alloc_fresh_huge_page(h))
break;
}
h->max_huge_pages = h->free_huge_pages = h->nr_huge_pages = i;
h->max_huge_pages = i;
}
static void __init hugetlb_init_hstates(void)
@ -1005,7 +1000,9 @@ static void __init hugetlb_init_hstates(void)
struct hstate *h;
for_each_hstate(h) {
hugetlb_init_one_hstate(h);
/* oversize hugepages were init'ed in early boot */
if (h->order < MAX_ORDER)
hugetlb_hstate_alloc_pages(h);
}
}
@ -1301,6 +1298,8 @@ module_init(hugetlb_init);
void __init hugetlb_add_hstate(unsigned order)
{
struct hstate *h;
unsigned long i;
if (size_to_hstate(PAGE_SIZE << order)) {
printk(KERN_WARNING "hugepagesz= specified twice, ignoring\n");
return;
@ -1310,15 +1309,21 @@ void __init hugetlb_add_hstate(unsigned order)
h = &hstates[max_hstate++];
h->order = order;
h->mask = ~((1ULL << (order + PAGE_SHIFT)) - 1);
h->nr_huge_pages = 0;
h->free_huge_pages = 0;
for (i = 0; i < MAX_NUMNODES; ++i)
INIT_LIST_HEAD(&h->hugepage_freelists[i]);
h->hugetlb_next_nid = first_node(node_online_map);
snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
huge_page_size(h)/1024);
hugetlb_init_one_hstate(h);
parsed_hstate = h;
}
static int __init hugetlb_setup(char *s)
{
unsigned long *mhp;
static unsigned long *last_mhp;
/*
* !max_hstate means we haven't parsed a hugepagesz= parameter yet,
@ -1329,9 +1334,25 @@ static int __init hugetlb_setup(char *s)
else
mhp = &parsed_hstate->max_huge_pages;
if (mhp == last_mhp) {
printk(KERN_WARNING "hugepages= specified twice without "
"interleaving hugepagesz=, ignoring\n");
return 1;
}
if (sscanf(s, "%lu", mhp) <= 0)
*mhp = 0;
/*
* Global state is always initialized later in hugetlb_init.
* But we need to allocate >= MAX_ORDER hstates here early to still
* use the bootmem allocator.
*/
if (max_hstate && parsed_hstate->order >= MAX_ORDER)
hugetlb_hstate_alloc_pages(parsed_hstate);
last_mhp = mhp;
return 1;
}
__setup("hugepages=", hugetlb_setup);