From: Shen Yong <b00...@freescale.com>
The trace point follows the same logic/style as the block_dump code
and pretty much dumps the same data, just not to dmesg (and thus to
/var/log/messages) but via the trace events streams.
Signed-of-by: Arjan van de Ven <ar...@linux.intel.com>
---
fs/fs-writeback.c | 4 +++
fs/inode.c | 4 +++
include/trace/events/vfs.h | 53 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 61 insertions(+), 0 deletions(-)
create mode 100644 include/trace/events/vfs.h
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index d5be169..6a2af1d 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -26,6 +26,7 @@
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
+#include <trace/events/vfs.h>
#include "internal.h"
#define inode_to_bdi(inode) ((inode)->i_mapping->backing_dev_info)
@@ -900,6 +901,9 @@ void __mark_inode_dirty(struct inode *inode, int flags)
sb->s_op->dirty_inode(inode);
}
+ if (flags & (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES))
+ trace_dirty_inode(inode, current);
+
/*
* make sure that changes are seen by all cpus before we test i_state
* -- mikulas
diff --git a/fs/inode.c b/fs/inode.c
index 722860b..a06184f 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1626,3 +1626,7 @@ void inode_init_owner(struct inode *inode, const struct
inode *dir,
inode->i_mode = mode;
}
EXPORT_SYMBOL(inode_init_owner);
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/vfs.h>
+
diff --git a/include/trace/events/vfs.h b/include/trace/events/vfs.h
new file mode 100644
index 0000000..21cf9fb
--- /dev/null
+++ b/include/trace/events/vfs.h
@@ -0,0 +1,53 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM vfs
+
+#if !defined(_TRACE_VFS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_VFS_H
+
+/*
+ * Tracepoint for dirtying an inode:
+ */
+TRACE_EVENT(dirty_inode,
+
+ TP_PROTO(struct inode *inode, struct task_struct *task),
+
+ TP_ARGS(inode, task),
+
+ TP_STRUCT__entry(
+ __array( char, comm, TASK_COMM_LEN )
+ __field( pid_t, pid )
+ __array( char, dev, 16 )
+ __array( char, file, 32 )
+ ),
+
+ TP_fast_assign(
+ if (inode->i_ino || strcmp(inode->i_sb->s_id, "bdev")) {
+ struct dentry *dentry;
+ const char *name = "?";
+
+ dentry = d_find_alias(inode);
+ if (dentry) {
+ spin_lock(&dentry->d_lock);
+ name = (const char *) dentry->d_name.name;
+ }
+
+ memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
+ __entry->pid = task->pid;
+ strlcpy(__entry->file, name, 32);
+ strlcpy(__entry->dev, inode->i_sb->s_id, 16);
+
+ if (dentry) {
+ spin_unlock(&dentry->d_lock);
+ dput(dentry);
+ }
+ }
+ ),
+
+ TP_printk("task=%i (%s) file=%s dev=%s",
+ __entry->pid, __entry->comm, __entry->file, __entry->dev)
+);
+
+#endif /* _TRACE_VFS_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
1.6.3.3
_______________________________________________
linaro-dev mailing list
linaro-dev@lists.linaro.org
http://lists.linaro.org/mailman/listinfo/linaro-dev
