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authorAndi Kleen <ak@suse.de>2008-07-23 21:27:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:18 -0700
commit8faa8b077b2cdc4e4646842fe50b07840955a013 (patch)
tree9c55a56ad5bb36219c8cf030329e67acd1b7e2e0 /mm
parentaa888a74977a8f2120ae9332376e179c39a6b07d (diff)
downloadop-kernel-dev-8faa8b077b2cdc4e4646842fe50b07840955a013.zip
op-kernel-dev-8faa8b077b2cdc4e4646842fe50b07840955a013.tar.gz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/hugetlb.c39
1 files changed, 30 insertions, 9 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 1a6fe87..243a868 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -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);
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