This patch adds a tracepoint for f2fs_read_data_pages to trace when pages are
readahead by VFS.
Signed-off-by: Chao Yu <chao2.yu@xxxxxxxxxxx>
---
fs/f2fs/data.c | 3 +++
include/trace/events/f2fs.h | 26 ++++++++++++++++++++++++++
2 files changed, 29 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 8c250a5..f2d1e8a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -729,6 +729,9 @@ static int f2fs_read_data_pages(struct file *file,
struct list_head *pages, unsigned nr_pages)
{
struct inode *inode = file->f_mapping->host;
+ struct page *page = list_entry(pages->prev, struct page, lru);
+
+ trace_f2fs_readpages(inode, page, nr_pages);
/* If the file has inline data, skip readpages */
if (f2fs_has_inline_data(inode))
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index b983990..7fbaaaa 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -847,6 +847,32 @@ TRACE_EVENT(f2fs_writepages,
__entry->for_sync)
);
+TRACE_EVENT(f2fs_readpages,
+
+ TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage),
+
+ TP_ARGS(inode, page, nrpage),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(ino_t, ino)
+ __field(pgoff_t, start)
+ __field(unsigned int, nrpage)
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->start = page->index;
+ __entry->nrpage = nrpage;
+ ),
+
+ TP_printk("dev = (%d,%d), ino = %lu, start = %lu nrpage = %u",
+ show_dev_ino(__entry),
+ (unsigned long)__entry->start,
+ __entry->nrpage)
+);
+
TRACE_EVENT(f2fs_submit_page_mbio,
TP_PROTO(struct page *page, int rw, int type, block_t blk_addr),
--
1.7.9.5
--
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