[RFC][PATCH 2/3] track numbers of pagetable pages

[Dave Hansen]

Now that we have the mm in the constructor and destructor, it's
simple to to bump a counter.  Add the counter to the mm and use
the existing MM_* counter infrastructure.

Signed-off-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
---

 linux-2.6.git-dave/include/linux/mm.h       |    2 ++
 linux-2.6.git-dave/include/linux/mm_types.h |    1 +
 2 files changed, 3 insertions(+)

diff -puN include/linux/mm.h~track-pagetable-pages include/linux/mm.h
--- linux-2.6.git/include/linux/mm.h~track-pagetable-pages	2011-04-15 10:37:10.768832396 -0700
+++ linux-2.6.git-dave/include/linux/mm.h	2011-04-15 10:37:10.780832393 -0700
@@ -1245,12 +1245,14 @@ static inline pmd_t *pmd_alloc(struct mm
 static inline void pgtable_page_ctor(struct mm_struct *mm, struct page *page)
 {
 	pte_lock_init(page);
+	inc_mm_counter(mm, MM_PTEPAGES);
 	inc_zone_page_state(page, NR_PAGETABLE);
 }
 
 static inline void pgtable_page_dtor(struct mm_struct *mm, struct page *page)
 {
 	pte_lock_deinit(page);
+	dec_mm_counter(mm, MM_PTEPAGES);
 	dec_zone_page_state(page, NR_PAGETABLE);
 }
 
diff -puN include/linux/mm_types.h~track-pagetable-pages include/linux/mm_types.h
--- linux-2.6.git/include/linux/mm_types.h~track-pagetable-pages	2011-04-15 10:37:10.772832395 -0700
+++ linux-2.6.git-dave/include/linux/mm_types.h	2011-04-15 10:37:10.780832393 -0700
@@ -200,6 +200,7 @@ enum {
 	MM_FILEPAGES,
 	MM_ANONPAGES,
 	MM_SWAPENTS,
+	MM_PTEPAGES,
 	NR_MM_COUNTERS
 };
 
_
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