diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 63 |
1 files changed, 43 insertions, 20 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 8fb86ba..82efecb 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -32,6 +32,7 @@ static unsigned int surplus_huge_pages_node[MAX_NUMNODES]; static gfp_t htlb_alloc_mask = GFP_HIGHUSER; unsigned long hugepages_treat_as_movable; int hugetlb_dynamic_pool; +static int hugetlb_next_nid; /* * Protects updates to hugepage_freelists, nr_huge_pages, and free_huge_pages @@ -165,36 +166,56 @@ static int adjust_pool_surplus(int delta) return ret; } -static int alloc_fresh_huge_page(void) +static struct page *alloc_fresh_huge_page_node(int nid) { - static int prev_nid; struct page *page; - int nid; - - /* - * Copy static prev_nid to local nid, work on that, then copy it - * back to prev_nid afterwards: otherwise there's a window in which - * a racer might pass invalid nid MAX_NUMNODES to alloc_pages_node. - * But we don't need to use a spin_lock here: it really doesn't - * matter if occasionally a racer chooses the same nid as we do. - */ - nid = next_node(prev_nid, node_online_map); - if (nid == MAX_NUMNODES) - nid = first_node(node_online_map); - prev_nid = nid; - page = alloc_pages_node(nid, htlb_alloc_mask|__GFP_COMP|__GFP_NOWARN, - HUGETLB_PAGE_ORDER); + page = alloc_pages_node(nid, + htlb_alloc_mask|__GFP_COMP|__GFP_THISNODE|__GFP_NOWARN, + HUGETLB_PAGE_ORDER); if (page) { set_compound_page_dtor(page, free_huge_page); spin_lock(&hugetlb_lock); nr_huge_pages++; - nr_huge_pages_node[page_to_nid(page)]++; + nr_huge_pages_node[nid]++; spin_unlock(&hugetlb_lock); put_page(page); /* free it into the hugepage allocator */ - return 1; } - return 0; + + return page; +} + +static int alloc_fresh_huge_page(void) +{ + struct page *page; + int start_nid; + int next_nid; + int ret = 0; + + start_nid = hugetlb_next_nid; + + do { + page = alloc_fresh_huge_page_node(hugetlb_next_nid); + if (page) + ret = 1; + /* + * Use a helper variable to find the next node and then + * copy it back to hugetlb_next_nid afterwards: + * otherwise there's a window in which a racer might + * pass invalid nid MAX_NUMNODES to alloc_pages_node. + * But we don't need to use a spin_lock here: it really + * doesn't matter if occasionally a racer chooses the + * same nid as we do. Move nid forward in the mask even + * if we just successfully allocated a hugepage so that + * the next caller gets hugepages on the next node. + */ + next_nid = next_node(hugetlb_next_nid, node_online_map); + if (next_nid == MAX_NUMNODES) + next_nid = first_node(node_online_map); + hugetlb_next_nid = next_nid; + } while (!page && hugetlb_next_nid != start_nid); + + return ret; } static struct page *alloc_buddy_huge_page(struct vm_area_struct *vma, @@ -365,6 +386,8 @@ static int __init hugetlb_init(void) for (i = 0; i < MAX_NUMNODES; ++i) INIT_LIST_HEAD(&hugepage_freelists[i]); + hugetlb_next_nid = first_node(node_online_map); + for (i = 0; i < max_huge_pages; ++i) { if (!alloc_fresh_huge_page()) break; |
