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Subject[PATCH 34/47] writeback: trace writeback_single_inode()
It is valuable to know how the inodes are iterated and their IO size.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
fs/fs-writeback.c | 12 +++---
include/trace/events/writeback.h | 52 +++++++++++++++++++++++++++++
2 files changed, 59 insertions(+), 5 deletions(-)
--- linux-next.orig/fs/fs-writeback.c 2010-12-09 22:15:49.000000000 +0800
+++ linux-next/fs/fs-writeback.c 2010-12-09 22:15:50.000000000 +0800
@@ -331,7 +331,7 @@ writeback_single_inode(struct inode *ino
{
struct address_space *mapping = inode->i_mapping;
long per_file_limit = wbc->per_file_limit;
- long uninitialized_var(nr_to_write);
+ long nr_to_write = wbc->nr_to_write;
unsigned dirty;
int ret;

@@ -351,7 +351,8 @@ writeback_single_inode(struct inode *ino
*/
if (wbc->sync_mode != WB_SYNC_ALL) {
requeue_io(inode);
- return 0;
+ ret = 0;
+ goto out;
}

/*
@@ -367,10 +368,8 @@ writeback_single_inode(struct inode *ino
inode->i_state &= ~I_DIRTY_PAGES;
spin_unlock(&inode_lock);

- if (per_file_limit) {
- nr_to_write = wbc->nr_to_write;
+ if (per_file_limit)
wbc->nr_to_write = per_file_limit;
- }

ret = do_writepages(mapping, wbc);

@@ -446,6 +445,9 @@ writeback_single_inode(struct inode *ino
}
}
inode_sync_complete(inode);
+out:
+ trace_writeback_single_inode(inode, wbc,
+ nr_to_write - wbc->nr_to_write);
return ret;
}

--- linux-next.orig/include/trace/events/writeback.h 2010-12-09 22:15:49.000000000 +0800
+++ linux-next/include/trace/events/writeback.h 2010-12-09 22:21:41.000000000 +0800
@@ -10,6 +10,19 @@

struct wb_writeback_work;

+#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"} \
+ )
+
DECLARE_EVENT_CLASS(writeback_work_class,
TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work),
TP_ARGS(bdi, work),
@@ -149,6 +162,45 @@ DEFINE_WBC_EVENT(wbc_writeback_written);
DEFINE_WBC_EVENT(wbc_writeback_wait);
DEFINE_WBC_EVENT(wbc_writepage);

+TRACE_EVENT(writeback_single_inode,
+
+ TP_PROTO(struct inode *inode,
+ struct writeback_control *wbc,
+ unsigned long wrote
+ ),
+
+ TP_ARGS(inode, wbc, wrote),
+
+ TP_STRUCT__entry(
+ __array(char, name, 32)
+ __field(unsigned long, ino)
+ __field(unsigned long, state)
+ __field(unsigned long, age)
+ __field(unsigned long, wrote)
+ __field(long, nr_to_write)
+ ),
+
+ 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->wrote = wrote;
+ __entry->nr_to_write = wbc->nr_to_write;
+ ),
+
+ TP_printk("bdi %s: ino=%lu state=%s age=%lu wrote=%lu to_write=%ld",
+ __entry->name,
+ __entry->ino,
+ show_inode_state(__entry->state),
+ __entry->age,
+ __entry->wrote,
+ __entry->nr_to_write
+ )
+);
+
TRACE_EVENT(balance_dirty_state,

TP_PROTO(struct address_space *mapping,



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