[PATCH v1] ubifs: support page statistics in vmstat

[Stanley Chu <stanley.chu@xxxxxxxxxxxx>]

Currently PGPGIN and PGPGOUT statistics in vmstat is only
hooked in submit_bio() for block device I/O path.

This patch adds this feature for ubifs as well.

Change-Id: I8505bd2a7aa9eadc6abcd68b7d8b870752e71339
Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
---
 fs/ubifs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 512e7d9c60cd..ffe7ce77f389 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -902,6 +902,8 @@ static int ubifs_bulk_read(struct page *page)
 
 static int ubifs_readpage(struct file *file, struct page *page)
 {
+	count_vm_events(PGPGIN, PAGE_CACHE_SIZE >> 9);
+
 	if (ubifs_bulk_read(page))
 		return 0;
 	do_readpage(page);
@@ -1032,6 +1034,8 @@ static int ubifs_writepage(struct page *page, struct writeback_control *wbc)
 		goto out_unlock;
 	}
 
+	count_vm_events(PGPGOUT, PAGE_CACHE_SIZE >> 9);
+
 	spin_lock(&ui->ui_lock);
 	synced_i_size = ui->synced_i_size;
 	spin_unlock(&ui->ui_lock);
-- 
2.18.0


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