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author | Theodore Ts'o <tytso@mit.edu> | 2013-02-08 21:59:22 -0500 |
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committer | Theodore Ts'o <tytso@mit.edu> | 2013-02-08 21:59:22 -0500 |
commit | 9924a92a8c217576bd2a2b1bbbb854462f1a00ae (patch) | |
tree | 5c4eaee350e38cd2854fd6029da9f2a822ee184e /fs/ext4/move_extent.c | |
parent | 722887ddc8982ff40e40b650fbca9ae1e56259bc (diff) | |
download | linux-stable-9924a92a8c217576bd2a2b1bbbb854462f1a00ae.tar.gz linux-stable-9924a92a8c217576bd2a2b1bbbb854462f1a00ae.tar.bz2 linux-stable-9924a92a8c217576bd2a2b1bbbb854462f1a00ae.zip |
ext4: pass context information to jbd2__journal_start()
So we can better understand what bits of ext4 are responsible for
long-running jbd2 handles, use jbd2__journal_start() so we can pass
context information for logging purposes.
The recommended way for finding the longer-running handles is:
T=/sys/kernel/debug/tracing
EVENT=$T/events/jbd2/jbd2_handle_stats
echo "interval > 5" > $EVENT/filter
echo 1 > $EVENT/enable
./run-my-fs-benchmark
cat $T/trace > /tmp/problem-handles
This will list handles that were active for longer than 20ms. Having
longer-running handles is bad, because a commit started at the wrong
time could stall for those 20+ milliseconds, which could delay an
fsync() or an O_SYNC operation. Here is an example line from the
trace file describing a handle which lived on for 311 jiffies, or over
1.2 seconds:
postmark-2917 [000] .... 196.435786: jbd2_handle_stats: dev 254,32
tid 570 type 2 line_no 2541 interval 311 sync 0 requested_blocks 1
dirtied_blocks 0
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/move_extent.c')
-rw-r--r-- | fs/ext4/move_extent.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c index e4cdb5188f34..0d6734394eac 100644 --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -923,7 +923,7 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode, again: *err = 0; jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; - handle = ext4_journal_start(orig_inode, jblocks); + handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks); if (IS_ERR(handle)) { *err = PTR_ERR(handle); return 0; |