Date: Mon, 27 Feb 2006 16:31:36 -0500
From: Shailabh Nagar <nagar@watson.ibm.com>
Subject: Re: [Patch 5/7]  synchronous block I/O delays
In-reply-to: <p73fym428cf.fsf@verdi.suse.de>
To: Andi Kleen <ak@suse.de>
Cc: lse-tech <lse-tech@lists.sourceforge.net>, linux-kernel@vger.kernel.org
Message-id: <44036FB8.1090503@watson.ibm.com>
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Andi Kleen wrote:

>Shailabh Nagar <nagar@watson.ibm.com> writes:
>
>  
>
>>delayacct-blkio.patch
>>
>>Record time spent by a task waiting for completion of 
>>userspace initiated synchronous block I/O. This can help
>>determine the right I/O priority for the task.
>>    
>>
>
>I think it's a good idea to have such a statistic by default.
>
>Can you add a counter that is summed up in task_struct and reports
>in /proc/*/stat so that it could be displayed by top? 
>  
>
Sure. That would make delayacct code simpler too since it could just 
read off from task_struct.

>This way it would be useful even with "normal" user space.
>  
>
Yes. Need to resolve the multiple entry point semantic...more in 
separate mail.

--Shailabh

>-Andi
>  
>

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