Re: RFC vmstat: On demand vmstat threads

[Gilad Ben-Yossef]

On Wed, Sep 4, 2013 at 7:48 PM, Christoph Lameter <cl@xxxxxxxxx> wrote:
>
> vmstat threads are used for folding counter differentials into the
> zone, per node and global counters at certain time intervals.
>
> They currently run at defined intervals on all processors which will
> cause some holdoff for processors that need minimal intrusion by the
> OS.
>
> This patch creates a vmstat sheperd task that monitors the
> per cpu differentials on all processors. If there are differentials
> on a processor then a vmstat thread local to the processors with
> the differentials is created. That process will then start
> folding the diffs in regular intervals. Should the vmstat
> process find that there is no work to be done then it will
> terminate itself and make the sheperd task monitor the differentials
> again.
>

I wasn't happy with the results of my own attempt to accomplish the same and I
like this much better. So, for what it's worth -

Reviewed-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>

Thanks,
Gilad


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Gilad Ben-Yossef
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