Re: [RFC v2 0/2] vmevent: A bit reworked pressure attribute + docs +man page

[Minchan Kim]

Hi Pekka,

On Thu, Oct 25, 2012 at 09:44:52AM +0300, Pekka Enberg wrote:
> On Thu, Oct 25, 2012 at 9:40 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote:
> > Your description doesn't include why we need new vmevent_fd(2).
> > Of course, it's very flexible and potential to add new VM knob easily but
> > the thing we is about to use now is only VMEVENT_ATTR_PRESSURE.
> > Is there any other use cases for swap or free? or potential user?
> > Adding vmevent_fd without them is rather overkill.
> 
> What ABI would you use instead?

I thought /dev/some_knob like mem_notify and epoll is enough but please keep in mind
that I'm not against vmevent_fd strongly. My point is that description should include
explain about why other candidate is not good or why vmevent_fd is better.
(But at least, I don't like vmevent timer polling still and I hope we use it
as last resort once we can find another)

> 
> On Thu, Oct 25, 2012 at 9:40 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote:
> > I don't object but we need rationale for adding new system call which should
> > be maintained forever once we add it.
> 
> Agreed.
> 
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-- 
Kind regards,
Minchan Kim
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