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Commit d7cfa468 authored by Theodore Ts'o's avatar Theodore Ts'o
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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: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent e07f7183

fs/jbd2/journal.c

+3 −0
Original line number Diff line number Diff line
@@ -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",