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[PATCHv6 07/30] thp, vmstats: add counters for huge file pages

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THP_FILE_ALLOC: how many times huge page was allocated and put page
cache.

THP_FILE_MAPPED: how many times file huge page was mapped.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 include/linux/vm_event_item.h | 7 +++++++
 mm/memory.c                   | 1 +
 mm/vmstat.c                   | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index ec084321fe09..42604173f122 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -70,6 +70,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		THP_FAULT_FALLBACK,
 		THP_COLLAPSE_ALLOC,
 		THP_COLLAPSE_ALLOC_FAILED,
+		THP_FILE_ALLOC,
+		THP_FILE_MAPPED,
 		THP_SPLIT_PAGE,
 		THP_SPLIT_PAGE_FAILED,
 		THP_DEFERRED_SPLIT_PAGE,
@@ -100,4 +102,9 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		NR_VM_EVENT_ITEMS
 };
 
+#ifndef CONFIG_TRANSPARENT_HUGEPAGE
+#define THP_FILE_ALLOC ({ BUILD_BUG(); 0; })
+#define THP_FILE_MAPPED ({ BUILD_BUG(); 0; })
+#endif
+
 #endif		/* VM_EVENT_ITEM_H_INCLUDED */
diff --git a/mm/memory.c b/mm/memory.c
index f9054d5f7775..c41804c0d524 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2914,6 +2914,7 @@ static int do_set_pmd(struct fault_env *fe, struct page *page)
 
 	/* fault is handled */
 	ret = 0;
+	count_vm_event(THP_FILE_MAPPED);
 out:
 	spin_unlock(fe->ptl);
 	return ret;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 5e4300482897..b898bc35b214 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -846,6 +846,8 @@ const char * const vmstat_text[] = {
 	"thp_fault_fallback",
 	"thp_collapse_alloc",
 	"thp_collapse_alloc_failed",
+	"thp_file_alloc",
+	"thp_file_mapped",
 	"thp_split_page",
 	"thp_split_page_failed",
 	"thp_deferred_split_page",
-- 
2.8.0.rc3

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[PATCHv6 00/30] THP-enabled tmpfs/shmem using compound pages "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 11/30] thp: handle file pages in mremap() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 17/30] vmscan: split file huge pages before paging them out "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 06/30] mm: introduce do_set_pmd() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 14/30] thp: run vma_adjust_trans_huge() outside i_mmap_rwsem "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 10/30] thp: handle file COW faults "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 22/30] mm, rmap: account shmem thp pages "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 26/30] shmem, thp: respect MADV_{NO,}HUGEPAGE for file mappings "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 15/30] thp: file pages support for split_huge_page() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 01/30] thp, mlock: update unevictable-lru.txt "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 18/30] page-flags: relax policy for PG_mappedtodisk and PG_reclaim "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 05/30] rmap: support file thp "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 08/30] thp: support file pages in zap_huge_pmd() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 12/30] thp: skip file huge pmd on copy_huge_pmd() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 13/30] thp: prepare change_huge_pmd() for file thp "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 21/30] truncate: handle file thp "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 07/30] thp, vmstats: add counters for huge file pages "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 20/30] filemap: prepare find and delete operations for huge pages "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 23/30] shmem: prepare huge= mount option and sysfs knob "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 19/30] radix-tree: implement radix_tree_maybe_preload_order() "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:00 +0200
  [PATCHv6 04/30] mm: postpone page table allocation until we have page to map "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:10 +0200
  [PATCHv6 02/30] mm: do not pass mm_struct into handle_mm_fault "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-04-07 01:10 +0200

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