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ext4: display average commit time

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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>
This commit is contained in:
Theodore Ts'o 2008-12-17 00:20:45 -05:00
parent e07f7183a4
commit d7cfa4684d
1 changed files with 3 additions and 0 deletions
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3
fs/jbd2/journal.c
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@ -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",