linux-ext4 - Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

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Message-ID: <20120324031357.GA5690@tassilo.jf.intel.com>
Date:	Fri, 23 Mar 2012 20:13:57 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	tytso@....edu, linux-ext4@...r.kernel.org,
	tim.c.chen@...ux.intel.com
Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

> The patch only disables the statistics counting, but not the sysfs
> files that will now report bogus statistics.  I don't disagree with
> disabling these stats, but if you are disabling the accounting you
> should also comment out the functions in fs/ext4/super.c that are
> printing out these statistics.

Aware of that -- that is why it was just a RFC.
The choice is between per cpu counters or completely removing them.
I would prefer the later.

-Andi

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