diff options
| -rw-r--r-- | mm/hugetlb.c | 70 |
1 files changed, 45 insertions, 25 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 5d7601b02874..bffcf774f60b 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -622,6 +622,20 @@ static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid) } /* + * common helper function for hstate_next_node_to_{alloc|free}. + * return next node in node_online_map, wrapping at end. + */ +static int next_node_allowed(int nid) +{ + nid = next_node(nid, node_online_map); + if (nid == MAX_NUMNODES) + nid = first_node(node_online_map); + VM_BUG_ON(nid >= MAX_NUMNODES); + + return nid; +} + +/* * Use a helper variable to find the next node and then * copy it back to next_nid_to_alloc afterwards: * otherwise there's a window in which a racer might @@ -634,12 +648,12 @@ static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid) */ static int hstate_next_node_to_alloc(struct hstate *h) { - int next_nid; - next_nid = next_node(h->next_nid_to_alloc, node_online_map); - if (next_nid == MAX_NUMNODES) - next_nid = first_node(node_online_map); + int nid, next_nid; + + nid = h->next_nid_to_alloc; + next_nid = next_node_allowed(nid); h->next_nid_to_alloc = next_nid; - return next_nid; + return nid; } static int alloc_fresh_huge_page(struct hstate *h) @@ -649,15 +663,17 @@ static int alloc_fresh_huge_page(struct hstate *h) int next_nid; int ret = 0; - start_nid = h->next_nid_to_alloc; + start_nid = hstate_next_node_to_alloc(h); next_nid = start_nid; do { page = alloc_fresh_huge_page_node(h, next_nid); - if (page) + if (page) { ret = 1; + break; + } next_nid = hstate_next_node_to_alloc(h); - } while (!page && next_nid != start_nid); + } while (next_nid != start_nid); if (ret) count_vm_event(HTLB_BUDDY_PGALLOC); @@ -668,17 +684,19 @@ static int alloc_fresh_huge_page(struct hstate *h) } /* - * helper for free_pool_huge_page() - find next node - * from which to free a huge page + * helper for free_pool_huge_page() - return the next node + * from which to free a huge page. Advance the next node id + * whether or not we find a free huge page to free so that the + * next attempt to free addresses the next node. */ static int hstate_next_node_to_free(struct hstate *h) { - int next_nid; - next_nid = next_node(h->next_nid_to_free, node_online_map); - if (next_nid == MAX_NUMNODES) - next_nid = first_node(node_online_map); + int nid, next_nid; + + nid = h->next_nid_to_free; + next_nid = next_node_allowed(nid); h->next_nid_to_free = next_nid; - return next_nid; + return nid; } /* @@ -693,7 +711,7 @@ static int free_pool_huge_page(struct hstate *h, bool acct_surplus) int next_nid; int ret = 0; - start_nid = h->next_nid_to_free; + start_nid = hstate_next_node_to_free(h); next_nid = start_nid; do { @@ -715,9 +733,10 @@ static int free_pool_huge_page(struct hstate *h, bool acct_surplus) } update_and_free_page(h, page); ret = 1; + break; } next_nid = hstate_next_node_to_free(h); - } while (!ret && next_nid != start_nid); + } while (next_nid != start_nid); return ret; } @@ -1028,10 +1047,9 @@ int __weak alloc_bootmem_huge_page(struct hstate *h) void *addr; addr = __alloc_bootmem_node_nopanic( - NODE_DATA(h->next_nid_to_alloc), + NODE_DATA(hstate_next_node_to_alloc(h)), huge_page_size(h), huge_page_size(h), 0); - hstate_next_node_to_alloc(h); if (addr) { /* * Use the beginning of the huge page to store the @@ -1167,29 +1185,31 @@ static int adjust_pool_surplus(struct hstate *h, int delta) VM_BUG_ON(delta != -1 && delta != 1); if (delta < 0) - start_nid = h->next_nid_to_alloc; + start_nid = hstate_next_node_to_alloc(h); else - start_nid = h->next_nid_to_free; + start_nid = hstate_next_node_to_free(h); next_nid = start_nid; do { int nid = next_nid; if (delta < 0) { - next_nid = hstate_next_node_to_alloc(h); /* * To shrink on this node, there must be a surplus page */ - if (!h->surplus_huge_pages_node[nid]) + if (!h->surplus_huge_pages_node[nid]) { + next_nid = hstate_next_node_to_alloc(h); continue; + } } if (delta > 0) { - next_nid = hstate_next_node_to_free(h); /* * Surplus cannot exceed the total number of pages */ if (h->surplus_huge_pages_node[nid] >= - h->nr_huge_pages_node[nid]) + h->nr_huge_pages_node[nid]) { + next_nid = hstate_next_node_to_free(h); continue; + } } h->surplus_huge_pages += delta; |