linux-kernel - Re: Proposal: Use hi-res clock for file timestamps

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Message-ID: <20100818175040.GA6567@basil.fritz.box>
Date:	Wed, 18 Aug 2010 19:50:40 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Neil Brown <neilb@...e.de>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Patrick J. LoPresti" <lopresti@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Proposal: Use hi-res clock for file timestamps

>  - nfsd updates it whenever it reads an mtime out of an inode that matches
>    current_fs_time to the granularity of 1/HZ.

That means you have a very very hot cache line on a larger system
if there are a lot of mtime changes. Probably a bad idea.

-Andi
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