Re: xfsaild centisecs /proc wakeup control?

Dave Chinner
2008-10-08T20:57:25Z

On Wed, Oct 08, 2008 at 12:44:41PM -0700, Linda A. Walsh wrote:
> I was looking at powertop again recently, and noticed xfsbufd and
> xfsaild at the top of the wakeup list. xfsbufd can be tuned with
> /proc/sys/fs/xfs/xfsbufd_centisecs along with 3 other time-related
> tunables. However, I don't see one for xfsaild. Is that an
> oversight?

No. The xfsaild is currently operating with watchdog functionality
to catch AIL push stalls due to a know problem that this new patch:

http://oss.sgi.com/archives/xfs/2008-10/msg00119.html

fixes.

After this has been included for a while (say a release), I
plan to remove the watchdog feature of the xfsaild so the
once-per-second-per-XFS-filesystem wakeup will go away then.

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com