linux-ext4 - [PATCH-v4 4/7] vfs: add lazytime tracepoints for better debugging

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Date:	Wed, 26 Nov 2014 05:23:54 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Linux Filesystem Development List <linux-fsdevel@...r.kernel.org>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Linux btrfs Developers List <linux-btrfs@...r.kernel.org>,
	XFS Developers <xfs@....sgi.com>, Theodore Ts'o <tytso@....edu>
Subject: [PATCH-v4 4/7] vfs: add lazytime tracepoints for better debugging

Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 fs/fs-writeback.c | 1 +
 fs/inode.c        | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 529480a..3d87174 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -27,6 +27,7 @@
 #include <linux/backing-dev.h>
 #include <linux/tracepoint.h>
 #include <linux/device.h>
+#include <trace/events/fs.h>
 #include "internal.h"
 
 /*
diff --git a/fs/inode.c b/fs/inode.c
index 37c0429..b2fea60 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -20,6 +20,9 @@
 #include <linux/list_lru.h>
 #include "internal.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/fs.h>
+
 /*
  * Inode locking rules:
  *
@@ -1443,6 +1446,7 @@ retry:
 				inode->i_op->write_time(inode);
 			else if (inode->i_sb->s_op->write_inode)
 				mark_inode_dirty_sync(inode);
+			trace_fs_lazytime_iput(inode);
 			goto retry;
 		}
 		iput_final(inode);
@@ -1561,6 +1565,7 @@ static int update_time(struct inode *inode, struct timespec *time, int flags)
 		inode->i_ts_dirty_day = days_since_boot;
 		spin_unlock(&inode->i_lock);
 		inode_requeue_dirtytime(inode);
+		trace_fs_lazytime_defer(inode);
 		return 0;
 	}
 force_dirty:
-- 
2.1.0

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