On Fri, Jun 26, 2015 at 11:15:31AM +0200, SF Markus Elfring wrote: > From: Markus Elfring <[email protected]> > Date: Fri, 26 Jun 2015 11:05:41 +0200 > > The xfs_qm_dqrele() function tests whether its argument is NULL and > then returns immediately.
True. > Thus the test around the call is not needed. But wrong. 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... Cheers, Dave. -- Dave Chinner [email protected] -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
