Re: [PATCH] sched: Provide iowait counters

[Andrew Morton]

On Mon, 20 Jul 2009 11:31:47 -0700 Arjan van de Ven <arjan@xxxxxxxxxxxxxxx> wrote:

> For counting how long an application has been waiting for (disk) IO,
> there currently is only the HZ sample driven information available, while
> for all other counters in this class, a high resolution version is
> available via CONFIG_SCHEDSTATS.
> 
> In order to make an improved bootchart tool possible, we also need
> a higher resolution version of the iowait time.
> 
> This patch below adds this scheduler statistic to the kernel.

Doesn't this duplicate the delay accounting already available via the
taskstats interface?

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