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authorAdam Litke <agl@us.ibm.com>2008-04-28 05:13:06 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 11:58:23 -0400
commit3b1163006332302117b1b2acf226d4014ff46525 (patch)
treec9e43179620cfe612ce57795cb0b1e1ceb2c9d1b /mm/hugetlb.c
parent122c7a59055c77434118d7dd4dff4b625d4a2c15 (diff)
Subject: [PATCH] hugetlb: vmstat events for huge page allocations
Allocating huge pages directly from the buddy allocator is not guaranteed to succeed. Success depends on several factors (such as the amount of physical memory available and the level of fragmentation). With the addition of dynamic hugetlb pool resizing, allocations can occur much more frequently. For these reasons it is desirable to keep track of huge page allocation successes and failures. Add two new vmstat entries to track huge page allocations that succeed and fail. The presence of the two entries is contingent upon CONFIG_HUGETLB_PAGE being enabled. [akpm@linux-foundation.org: reduced ifdeffery] Signed-off-by: Adam Litke <agl@us.ibm.com> Signed-off-by: Eric Munson <ebmunson@us.ibm.com> Tested-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Andy Whitcroft <apw@shadowen.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 93ea46a0fba..8deae4eb969 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -242,6 +242,11 @@ static int alloc_fresh_huge_page(void)
242 hugetlb_next_nid = next_nid; 242 hugetlb_next_nid = next_nid;
243 } while (!page && hugetlb_next_nid != start_nid); 243 } while (!page && hugetlb_next_nid != start_nid);
244 244
245 if (ret)
246 count_vm_event(HTLB_BUDDY_PGALLOC);
247 else
248 count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
249
245 return ret; 250 return ret;
246} 251}
247 252
@@ -302,9 +307,11 @@ static struct page *alloc_buddy_huge_page(struct vm_area_struct *vma,
302 */ 307 */
303 nr_huge_pages_node[nid]++; 308 nr_huge_pages_node[nid]++;
304 surplus_huge_pages_node[nid]++; 309 surplus_huge_pages_node[nid]++;
310 __count_vm_event(HTLB_BUDDY_PGALLOC);
305 } else { 311 } else {
306 nr_huge_pages--; 312 nr_huge_pages--;
307 surplus_huge_pages--; 313 surplus_huge_pages--;
314 __count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
308 } 315 }
309 spin_unlock(&hugetlb_lock); 316 spin_unlock(&hugetlb_lock);
310 317