2 files changed, 74 insertions, 0 deletions

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index f43c479feee9..5185fad48b62 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -346,6 +346,7 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
                        struct writeback_control *wbc)
 {
         struct address_space *mapping = inode->i_mapping;
+        long nr_to_write = wbc->nr_to_write;
         unsigned dirty;
         int ret;
 
@@ -368,6 +369,8 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
                  */
                 if (wbc->sync_mode != WB_SYNC_ALL) {
                         requeue_io(inode, wb);
+                        trace_writeback_single_inode_requeue(inode, wbc,
+                                                             nr_to_write);
                         return 0;
                 }
 
@@ -467,6 +470,7 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
                 }
         }
         inode_sync_complete(inode);
+        trace_writeback_single_inode(inode, wbc, nr_to_write);
         return ret;
 }
 
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index b2cfac5f3313..898277bc89b4 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -8,6 +8,19 @@
 #include <linux/device.h>
 #include <linux/writeback.h>
 
+#define show_inode_state(state)                                 \
+        __print_flags(state, "|",                               \
+                {I_DIRTY_SYNC,          "I_DIRTY_SYNC"},        \
+                {I_DIRTY_DATASYNC,      "I_DIRTY_DATASYNC"},    \
+                {I_DIRTY_PAGES,         "I_DIRTY_PAGES"},       \
+                {I_NEW,                 "I_NEW"},               \
+                {I_WILL_FREE,           "I_WILL_FREE"},         \
+                {I_FREEING,             "I_FREEING"},           \
+                {I_CLEAR,               "I_CLEAR"},             \
+                {I_SYNC,                "I_SYNC"},              \
+                {I_REFERENCED,          "I_REFERENCED"}         \
+        )
+
 struct wb_writeback_work;
 
 DECLARE_EVENT_CLASS(writeback_work_class,
@@ -184,6 +197,63 @@ DEFINE_EVENT(writeback_congest_waited_template, writeback_wait_iff_congested,
         TP_ARGS(usec_timeout, usec_delayed)
 );
 
+DECLARE_EVENT_CLASS(writeback_single_inode_template,
+
+        TP_PROTO(struct inode *inode,
+                 struct writeback_control *wbc,
+                 unsigned long nr_to_write
+        ),
+
+        TP_ARGS(inode, wbc, nr_to_write),
+
+        TP_STRUCT__entry(
+                __array(char, name, 32)
+                __field(unsigned long, ino)
+                __field(unsigned long, state)
+                __field(unsigned long, age)
+                __field(unsigned long, writeback_index)
+                __field(long, nr_to_write)
+                __field(unsigned long, wrote)
+        ),
+
+        TP_fast_assign(
+                strncpy(__entry->name,
+                        dev_name(inode->i_mapping->backing_dev_info->dev), 32);
+                __entry->ino            = inode->i_ino;
+                __entry->state          = inode->i_state;
+                __entry->age            = (jiffies - inode->dirtied_when) *
+                                                                1000 / HZ;
+                __entry->writeback_index = inode->i_mapping->writeback_index;
+                __entry->nr_to_write    = nr_to_write;
+                __entry->wrote          = nr_to_write - wbc->nr_to_write;
+        ),
+
+        TP_printk("bdi %s: ino=%lu state=%s age=%lu "
+                  "index=%lu to_write=%ld wrote=%lu",
+                  __entry->name,
+                  __entry->ino,
+                  show_inode_state(__entry->state),
+                  __entry->age,
+                  __entry->writeback_index,
+                  __entry->nr_to_write,
+                  __entry->wrote
+        )
+);
+
+DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode_requeue,
+        TP_PROTO(struct inode *inode,
+                 struct writeback_control *wbc,
+                 unsigned long nr_to_write),
+        TP_ARGS(inode, wbc, nr_to_write)
+);
+
+DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode,
+        TP_PROTO(struct inode *inode,
+                 struct writeback_control *wbc,
+                 unsigned long nr_to_write),
+        TP_ARGS(inode, wbc, nr_to_write)
+);
+
 #endif /* _TRACE_WRITEBACK_H */
 
 /* This part must be outside protection */