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Subject[PATCH 4/8] f2fs: add tracepoint for tracing the page i/o operations
Date
From: Namjae Jeon <namjae.jeon@samsung.com>

Add tracepoints for page i/o operations and block allocation
tracing during page read operation.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com>
---
fs/f2fs/data.c | 10 ++++++-
include/trace/events/f2fs.h | 68 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 7bd22a2..61beb82 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -21,6 +21,7 @@
#include "f2fs.h"
#include "node.h"
#include "segment.h"
+#include <trace/events/f2fs.h>

/*
* Lock ordering for the change of data block address:
@@ -334,6 +335,9 @@ int f2fs_readpage(struct f2fs_sb_info *sbi, struct page *page,
bool sync = (type == READ_SYNC);
struct bio *bio;

+ if (page->mapping)
+ trace_f2fs_readpage(page);
+
/* This page can be already read by other threads */
if (PageUptodate(page)) {
if (!sync)
@@ -384,6 +388,7 @@ static int get_data_block_ro(struct inode *inode, sector_t iblock,
pgoff_t pgofs;
int err;

+ trace_f2fs_get_data_block_enter(inode, iblock);
/* Get the page offset from the block offset(iblock) */
pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));

@@ -393,8 +398,10 @@ static int get_data_block_ro(struct inode *inode, sector_t iblock,
/* When reading holes, we need its node page */
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, pgofs, RDONLY_NODE);
- if (err)
+ if (err) {
+ trace_f2fs_get_data_block_exit(inode, err);
return (err == -ENOENT) ? 0 : err;
+ }

/* It does not support data allocation */
BUG_ON(create);
@@ -419,6 +426,7 @@ static int get_data_block_ro(struct inode *inode, sector_t iblock,
bh_result->b_size = (i << blkbits);
}
f2fs_put_dnode(&dn);
+ trace_f2fs_get_data_block_exit(inode, 0);
return 0;
}

diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index e29e782..ae25a1f 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -276,6 +276,74 @@ TRACE_EVENT(f2fs_truncate,
(unsigned long) __entry->ino)
);

+TRACE_EVENT(f2fs_readpage,
+ TP_PROTO(struct page *page),
+
+ TP_ARGS(page),
+
+ TP_STRUCT__entry(
+ __field(pgoff_t, index)
+ __field(ino_t, ino)
+ __field(dev_t, dev)
+
+ ),
+
+ TP_fast_assign(
+ __entry->index = page->index;
+ __entry->ino = page->mapping->host->i_ino;
+ __entry->dev = page->mapping->host->i_sb->s_dev;
+ ),
+
+ TP_printk("dev %d,%d ino %lu page_index %lu",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long) __entry->ino,
+ (unsigned long) __entry->index)
+);
+
+TRACE_EVENT(f2fs_get_data_block_enter,
+ TP_PROTO(struct inode *inode, sector_t block),
+
+ TP_ARGS(inode, block),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(ino_t, ino)
+ __field(sector_t, block)
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->block = block;
+ ),
+
+ TP_printk("dev %d,%d ino %lu block number %llu",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long) __entry->ino, __entry->block)
+);
+
+TRACE_EVENT(f2fs_get_data_block_exit,
+ TP_PROTO(struct inode *inode, int ret),
+
+ TP_ARGS(inode, ret),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(ino_t, ino)
+ __field(int, ret)
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("dev %d,%d ino %lu return value %d",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long) __entry->ino, __entry->ret)
+);
+
#endif /* _TRACE_F2FS_H */

/* This part must be outside protection */
--
1.7.9.5


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