linux-kernel - Re: XFS: Fine-tuning for checks before the function call "xfs_qm

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Message-ID: <55939BA8.1090400@users.sourceforge.net>
Date:	Wed, 01 Jul 2015 09:50:00 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Dave Chinner <david@...morbit.com>
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"?

> 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"?

Regards,
Markus
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