[PATCH 1/2] Add pgcollapse stat counter to task_struct

[Alex Thorlton]

Pretty self explanatory.  Just adding one of the same counters that I used to
gather data for the other patches.

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Bob Liu <lliubbo@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx

---
 include/linux/sched.h | 3 +++
 mm/huge_memory.c      | 1 +
 2 files changed, 4 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5e344bb..9b87d9a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1661,6 +1661,9 @@ struct task_struct {
 	unsigned int	sequential_io;
 	unsigned int	sequential_io_avg;
 #endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+	unsigned int pgcollapse_pages_collapsed;
+#endif
 };
 
 /* Future-safe accessor for struct task_struct's cpus_allowed. */
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 74c78aa..ca8a813 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2531,6 +2531,7 @@ static void collapse_huge_page(struct mm_struct *mm,
 
 	*hpage = NULL;
 
+        mm->owner->pgcollapse_pages_collapsed++;
 	khugepaged_pages_collapsed++;
 out_up_write:
 	up_write(&mm->mmap_sem);
-- 
1.7.12.4

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