Messages in this thread | | | Date | Thu, 2 Jul 2015 10:19:51 +1000 | From | Dave Chinner <> | Subject | Re: XFS: Fine-tuning for checks before the function call "xfs_qm_dqrele"? |
| |
On Wed, Jul 01, 2015 at 09:50:00AM +0200, SF Markus Elfring wrote: > > xfs_dqrele_inode() gets called on every inode in the inode cache, > > and this change results in a cacheline in every inode being dirtied > > even if they don't have dquots attached. Given the inode cache can > > hold tens to hundreds of millions of inodes on large machines, we > > don't want to dirty any cachelines we don't need to while walking > > the inode cache and releasing dquots... > > Would it make sense to annotate checks before such function calls > as "LIKELY"?
No - it will be random as to whether the inodes have dquots attached or not and so a static hint is always going to be wrong for someone....
Cheers,
Dave. -- Dave Chinner david@fromorbit.com
| |