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

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Message-ID: <20121025085309.GC15767@bbox>
Date:	Thu, 25 Oct 2012 17:53:09 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Mel Gorman <mgorman@...e.de>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, kernel-team@...roid.com,
	linux-man@...r.kernel.org
Subject: Re: [RFC v2 0/2] vmevent: A bit reworked pressure attribute + docs +
 man page

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@...nel.org> 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@...nel.org> 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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