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authorTheodore Ts'o <tytso@mit.edu>2008-10-05 20:50:06 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-05 20:50:06 -0400
commitede86cc473defab74d778aeac14b19f43129d4d1 (patch)
tree19da8009accf1737171f5949413e46a9086d5fdc /fs/ext4
parent23f8b79eae8a74e42a006ffa7c456e295c7e1c0d (diff)
downloadop-kernel-dev-ede86cc473defab74d778aeac14b19f43129d4d1.zip
op-kernel-dev-ede86cc473defab74d778aeac14b19f43129d4d1.tar.gz
ext4: Add debugging markers that can be used by systemtap
This debugging markers are designed to debug problems such as the random filesystem latency problems reported by Arjan. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/fsync.c5
-rw-r--r--fs/ext4/super.c2
2 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c
index c37d1e8..5afe437 100644
--- a/fs/ext4/fsync.c
+++ b/fs/ext4/fsync.c
@@ -28,6 +28,7 @@
#include <linux/writeback.h>
#include <linux/jbd2.h>
#include <linux/blkdev.h>
+#include <linux/marker.h>
#include "ext4.h"
#include "ext4_jbd2.h"
@@ -51,6 +52,10 @@ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
J_ASSERT(ext4_journal_current_handle() == NULL);
+ trace_mark(ext4_sync_file, "dev %s datasync %d ino %ld parent %ld",
+ inode->i_sb->s_id, datasync, inode->i_ino,
+ dentry->d_parent->d_inode->i_ino);
+
/*
* data=writeback:
* The caller's filemap_fdatawrite()/wait will sync the data.
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index dfcd41f..9c02146 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -35,6 +35,7 @@
#include <linux/quotaops.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
+#include <linux/marker.h>
#include <linux/log2.h>
#include <linux/crc16.h>
#include <asm/uaccess.h>
@@ -2951,6 +2952,7 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
{
tid_t target;
+ trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait);
sb->s_dirt = 0;
if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
if (wait)
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