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writeback: trace event writeback_single_inode

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It is valuable to know how the dirty inodes are iterated and their IO size.

"writeback_single_inode: bdi 8:0: ino=134246746 state=I_DIRTY_SYNC|I_SYNC age=414 index=0 to_write=1024 wrote=0"

- "state" reflects inode->i_state at the end of writeback_single_inode()
- "index" reflects mapping->writeback_index after the ->writepages() call
- "to_write" is the wbc->nr_to_write at entrance of writeback_single_inode()
- "wrote" is the number of pages actually written

v2: add trace event writeback_single_inode_requeue as proposed by Dave.

CC: Dave Chinner <[email protected]>
Signed-off-by: Wu Fengguang <[email protected]>
This commit is contained in:
Wu Fengguang 2010-12-01 17:33:37 -06:00
commit 251d6a471c
2 changed files with 74 additions and 0 deletions
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4
fs/fs-writeback.c
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@ -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;
}