On Wed, Sep 17, 2014 at 11:31:29AM +0200, Jan Kara wrote: > Yuanhan has reported that when he is running fsync(2) heavy workload > creating new files over ramdisk, significant amount of time is spent in > __jbd2_journal_clean_checkpoint_list() trying to clean old transactions > (but they cannot be cleaned up because flusher hasn't yet checkpointed > those buffers). The workload can be generated by: > fs_mark -d /fs/ram0/1 -D 2 -N 2560 -n 1000000 -L 1 -S 1 -s 4096 > > Reduce the amount of scanning by stopping to scan the transaction list > once we find a transaction that cannot be checkpointed. Note that this > way of cleaning is still enough to keep freeing space in the journal > after fully checkpointed transactions. > > Reported-and-tested-by: Yuanhan Liu <yuanhan.liu@xxxxxxxxxxxxxxx> > Signed-off-by: Jan Kara <jack@xxxxxxx> Applied, thanks. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
