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authorWu Fengguang <fengguang.wu@intel.com>2010-12-01 17:33:37 -0600
committerWu Fengguang <fengguang.wu@intel.com>2011-06-08 08:25:23 +0800
commit251d6a471c831e22880b3c146bb4556ddfb1dc82 (patch)
tree5ea61b9153866eda9f4164bf316c03786e1a7840 /fs/fs-writeback.c
parent846d5a091b0506b75489577cde27f39b37a192a4 (diff)
downloadlinux-251d6a471c831e22880b3c146bb4556ddfb1dc82.tar.bz2
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.c4
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;
}