f2fs: add a tracepoint for f2fs_read_data_pages

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@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index d4f1c74bab267ac4f43dc6f49df757d2260d01aa..228537657723929025ad89577275a345023c9a98 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1032,6 +1032,9 @@ 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 7de751d5763bc4794fde881cc6df6e7072c55173..00b4a6308249ea5bd90df0b2f161d189fc326312 100644 (file)
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -1028,6 +1028,32 @@ 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_write_checkpoint,
 
        TP_PROTO(struct super_block *sb, int reason, char *msg),