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Date: Thu, 2 Jul 2015 10:19:51 +1000 From: Dave Chinner <david@...morbit.com> To: SF Markus Elfring <elfring@...rs.sourceforge.net> Cc: xfs@....sgi.com, LKML <linux-kernel@...r.kernel.org>, kernel-janitors@...r.kernel.org, Julia Lawall <julia.lawall@...6.fr> 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@...morbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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