From: Liu Yuan <tailai.ly@xxxxxxxxxx>
The _readpages_ counter simply counts how many pages the kernel
really request from the disk, either by readahead module or
aop->readpage() when readahead window equals 0.
This counter is request-centric and doesnot check read errors
since the read requests are issued to the block layer already.
Signed-off-by: Liu Yuan <tailai.ly@xxxxxxxxxx>
---
mm/filemap.c | 1 +
mm/readahead.c | 2 ++
2 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 5388b2a..d638391 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1137,6 +1137,7 @@ readpage:
*/
ClearPageError(page);
/* Start the actual read. The read will unlock the page. */
+ page_cache_acct_readpages(mapping->host->i_sb, 1);
error = mapping->a_ops->readpage(filp, page);
if (unlikely(error)) {
diff --git a/mm/readahead.c b/mm/readahead.c
index 77506a2..483acb8 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -112,6 +112,8 @@ static int read_pages(struct address_space *mapping, struct file *filp,
unsigned page_idx;
int ret;
+ page_cache_acct_readpages(mapping->host->i_sb, nr_pages);
+
if (mapping->a_ops->readpages) {
ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
/* Clean up the remaining pages */
--
1.7.0.4
--
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