Re: [PATCH 2/5] vmevent: Convert from deferred timer to deferred work

[Pekka Enberg]

On Fri, Jun 8, 2012 at 9:58 AM, Anton Vorontsov
<anton.vorontsov@xxxxxxxxxx> wrote:
> If you're saying that we should set up a timer in the userland and
> constantly read /proc/vmstat, then we will cause CPU wake up
> every 100ms, which is not acceptable. Well, we can try to introduce
> deferrable timers for the userspace. But then it would still add
> a lot more overhead for our task, as this solution adds other two
> context switches to read and parse /proc/vmstat. I guess this is
> not a show-stopper though, so we can discuss this.
>
> Leonid, Pekka, what do you think about the idea?

That's exactly the kind of half-assed ABI that lead to people
inventing out-of-tree lowmem notifiers in the first place.

I'd be more interested to know what people think of Minchan's that
gets rid of vmstat sampling.
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