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author | Wu Fengguang <fengguang.wu@intel.com> | 2010-12-01 17:33:37 -0600 |
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committer | Wu Fengguang <fengguang.wu@intel.com> | 2011-06-08 08:25:23 +0800 |
commit | 251d6a471c831e22880b3c146bb4556ddfb1dc82 (patch) | |
tree | 5ea61b9153866eda9f4164bf316c03786e1a7840 /fs/fs-writeback.c | |
parent | 846d5a091b0506b75489577cde27f39b37a192a4 (diff) | |
download | linux-stable-251d6a471c831e22880b3c146bb4556ddfb1dc82.tar.gz linux-stable-251d6a471c831e22880b3c146bb4556ddfb1dc82.tar.bz2 linux-stable-251d6a471c831e22880b3c146bb4556ddfb1dc82.zip |
writeback: trace event writeback_single_inode
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 <david@fromorbit.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r-- | fs/fs-writeback.c | 4 |
1 files changed, 4 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; } |