Re: [Patch 5/7] synchronous block I/O delays

[Shailabh Nagar]

Andi Kleen wrote:

> Shailabh Nagar <nagar@xxxxxxxxxxxxxx> 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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