On Thu, Mar 22, 2012 at 10:29:56AM +1100, Dave Chinner wrote: > On Fri, Mar 16, 2012 at 01:55:44PM -0400, Christoph Hellwig wrote: > > Provide a variant of xlog_assign_tail_lsn that has the AIL lock already > > held. By doing so we do an additional atomic_read + atomic_set under > > the lock, which comes down to two instructions. > > > > Switch xfs_trans_ail_update_bulk and xfs_trans_ail_delete_bulk to the > > new version to reduce the number of lock roundtrips, and prepare for > > a new addition that would require a third lock roundtrip in > > xfs_trans_ail_delete_bulk. > > What new addition is that? I don't see it in this patchset (maybe > I'm just blind), so maybe this isn't necessary in the commit > message? The check for an empty AIL before waking up thread thread waiting for it. I'll add it to the commit log. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
