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ext4: Add debugging markers that can be used by systemtap

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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>
This commit is contained in:
Theodore Ts'o
2008-10-05 20:50:06 -04:00
parent 23f8b79eae
commit ede86cc473
4 changed files with 16 additions and 0 deletions
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5
fs/ext4/fsync.c
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@ -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.