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

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Message-ID: <CAOJsxLGsjTe13WjY_Q=BLBELwQXOjuwo7PiEKwONHUfR4mQmig@mail.gmail.com>
Date:	Thu, 25 Oct 2012 09:44:52 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Minchan Kim <minchan@...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

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?

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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