xlog_space_left: head behind tail

[Jan Kara]

On Thu 23-02-12 11:48:53, Jan Kara wrote:
>   Hello,
> 
>   when I run:
> while true; do ~/tests/xfstests-dev/ltp/fsstress -d /mnt -n 10000 -p 4; done
> 
> and in parallel
> 
> while true; do ./fsfreeze /mnt; sync; ./fsfreeze -u /mnt; sleep 3; done
> 
> where fsfreeze is a small utility freezing and unfreezing filesystem. I get
> warnings like:
  BTW, the first message is:
[ 1626.278347] XFS (vdb1): xlog_space_left: head behind tail
[ 1626.278349]   tail_cycle = 7, tail_bytes = 12907008
[ 1626.278351]   GH   cycle = 7, GH   bytes = 12907000

								Honza

> [ 2029.103193] XFS (vdb1): xlog_space_left: head behind tail
> [ 2029.103195]   tail_cycle = 10, tail_bytes = 6036480
> [ 2029.103197]   GH   cycle = 10, GH   bytes = 6035728
> [ 2029.103218] XFS (vdb1): xlog_space_left: head behind tail
> [ 2029.103219]   tail_cycle = 10, tail_bytes = 6036480
> [ 2029.103220]   GH   cycle = 10, GH   bytes = 6035728
> [ 2033.269796] XFS (vdb1): xlog_space_left: head behind tail
> [ 2033.269800]   tail_cycle = 10, tail_bytes = 6400512
> [ 2033.269803]   GH   cycle = 10, GH   bytes = 6399752
> [ 2033.269830] XFS (vdb1): xlog_space_left: head behind tail
> [ 2033.269835]   tail_cycle = 10, tail_bytes = 6400512
> [ 2033.269838]   GH   cycle = 10, GH   bytes = 6399752
> [ 2033.269847] XFS (vdb1): xlog_space_left: head behind tail
> [ 2033.269850]   tail_cycle = 10, tail_bytes = 6400512
> [ 2033.269852]   GH   cycle = 10, GH   bytes = 6399752
> [ 2033.269892] XFS (vdb1): xlog_space_left: head behind tail
> [ 2033.269894]   tail_cycle = 10, tail_bytes = 6400512
> [ 2033.269896]   GH   cycle = 10, GH   bytes = 6399752
> [ 2033.269915] XFS (vdb1): xlog_space_left: head behind tail
> [ 2033.269918]   tail_cycle = 10, tail_bytes = 6400512
> [ 2033.269920]   GH   cycle = 10, GH   bytes = 6399752
> 
> They usually start to appear like 20 minutes after starting the tests and
> when they start to appear they happen every couple of seconds (as you can
> see from the timestamps). Is it a real problem or just annoyance?
> 
> 								Honza
> -- 
> Jan Kara <jack at suse.cz>
> SUSE Labs, CR
-- 
Jan Kara <jack at suse.cz>
SUSE Labs, CR