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Re: Question: How to use systemtap count the total inode read from disk

To: "Ma, Jianpeng" <jianpeng.ma@xxxxxxxxx>
Subject: Re: Question: How to use systemtap count the total inode read from disk
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 30 Sep 2014 14:39:13 +1000
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <6AA21C22F0A5DA478922644AD2EC308C8C986B@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <6AA21C22F0A5DA478922644AD2EC308C8C986B@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Sep 30, 2014 at 02:39:28AM +0000, Ma, Jianpeng wrote:
> Hi all,
>   I want to count the total read inode from disk. 

XFS already does that for you:

$ pminfo -tf xfs.inode_ops.ig_missed

xfs.inode_ops.ig_missed [number of failed in memory inode lookup operations]
    value 1835354
$

And that's the number read from disk as reported by PCP.  If you
don't have PCP:

$ awk '/ig/ {print $5}' /proc/fs/xfs/stat
1835354
$

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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