linux-kernel - Re: I/O statistics per process

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Date:	Wed, 27 Sep 2006 23:22:02 +0200
From:	"roland" <devzero@....de>
To:	"Fengguang Wu" <fengguang.wu@...il.com>
Cc:	<linux-kernel@...r.kernel.org>, <lserinol@...il.com>,
	<akpm@...l.org>
Subject: Re: I/O statistics per process

thanks. tried to contact redflag, but they don`t answer. maybe support is 
being on holiday.... !?

linux kernel hackers - there is really no standard way to watch i/o metrics 
(bytes read/written) at process level?

it`s extremly hard for the admin to track down, what process is hogging the 
disk - especially if there is more than one task consuming cpu.

meanwhile i found blktrace and read into the documenation. looks really cool 
and seems to be very powerful tool - but it it`s seems a little bit 
"oversized" and not the right tool for this. seems to be for 
tracing/debugging/analysis

what about http://lkml.org/lkml/2005/9/12/89  "with following patch, 
userspace processes/utilities will be able to access per process I/O 
statistics. for example, top like utilites can use this information" which 
has been posted to lkml one year ago ? any update on this ?

roland

----- Original Message ----- 
From: "Fengguang Wu" <fengguang.wu@...il.com>
To: "roland" <devzero@....de>
Cc: <linux-kernel@...r.kernel.org>
Sent: Sunday, September 24, 2006 5:04 AM
Subject: Re: I/O statistics per process

> On Fri, Sep 22, 2006 at 09:12:05PM +0200, roland wrote:
>> is there a modified top/ps with i/o column, or is there yet missing
>> something at the kernel level for getting that counters from ?
>
> Red Flag(http://www.redflag-linux.com/eindex.html) has developed an
> iotop based on kprobes/systemtap. You can contact them if necessary. 

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