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authorTheodore Ts'o <tytso@mit.edu>2008-12-17 00:20:45 -0500
committerTheodore Ts'o <tytso@mit.edu>2008-12-17 00:20:45 -0500
commitd7cfa4684d82f58e5d7cb73b8a3c88c169937f25 (patch)
tree1a47a0b3f6a9964c965e590fb3c438c8916bc357
parente07f7183a486cf9783d1f8c9d2997b5b39eeb2d4 (diff)
downloadop-kernel-dev-d7cfa4684d82f58e5d7cb73b8a3c88c169937f25.zip
op-kernel-dev-d7cfa4684d82f58e5d7cb73b8a3c88c169937f25.tar.gz
ext4: display average commit time
Display the average commit time (which is used by the ext4 fsync batching patch) in /proc/fs/jbd2/*/info for performance tuning purposes. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
-rw-r--r--fs/jbd2/journal.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index e70d657..74d8729 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -40,6 +40,7 @@
#include <asm/uaccess.h>
#include <asm/page.h>
+#include <asm/div64.h>
EXPORT_SYMBOL(jbd2_journal_start);
EXPORT_SYMBOL(jbd2_journal_restart);
@@ -824,6 +825,8 @@ static int jbd2_seq_info_show(struct seq_file *seq, void *v)
jiffies_to_msecs(s->stats->u.run.rs_flushing / s->stats->ts_tid));
seq_printf(seq, " %ums logging transaction\n",
jiffies_to_msecs(s->stats->u.run.rs_logging / s->stats->ts_tid));
+ seq_printf(seq, " %luus average transaction commit time\n",
+ do_div(s->journal->j_average_commit_time, 1000));
seq_printf(seq, " %lu handles per transaction\n",
s->stats->u.run.rs_handle_count / s->stats->ts_tid);
seq_printf(seq, " %lu blocks per transaction\n",
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