From d8a8e1f0da3d29d7268b3300c96a059d63901b76 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Wed, 12 Dec 2012 13:51:09 -0800 Subject: thp, vmstat: implement HZP_ALLOC and HZP_ALLOC_FAILED events hzp_alloc is incremented every time a huge zero page is successfully allocated. It includes allocations which where dropped due race with other allocation. Note, it doesn't count every map of the huge zero page, only its allocation. hzp_alloc_failed is incremented if kernel fails to allocate huge zero page and falls back to using small pages. Signed-off-by: Kirill A. Shutemov Cc: Andrea Arcangeli Cc: Andi Kleen Cc: "H. Peter Anvin" Cc: Mel Gorman Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/huge_memory.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'mm/huge_memory.c') diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d89220cb1d9..9a5d45dfad4 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -184,8 +184,11 @@ retry: zero_page = alloc_pages((GFP_TRANSHUGE | __GFP_ZERO) & ~__GFP_MOVABLE, HPAGE_PMD_ORDER); - if (!zero_page) + if (!zero_page) { + count_vm_event(THP_ZERO_PAGE_ALLOC_FAILED); return 0; + } + count_vm_event(THP_ZERO_PAGE_ALLOC); preempt_disable(); if (cmpxchg(&huge_zero_pfn, 0, page_to_pfn(zero_page))) { preempt_enable(); -- cgit v1.2.3