linux-kernel - Re: vmevent: question?

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Message-ID: <CAOJsxLHxLbzp+nfc72pzzyAe8W5w-phbHhREdJ7Mg5P9JHeF5A@mail.gmail.com>
Date:	Thu, 3 May 2012 11:07:47 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>
Subject: Re: vmevent: question?

On Thu, May 3, 2012 at 10:57 AM, Minchan Kim <minchan@...nel.org> wrote:
> Sorry for my poor explanation.
> My point is when userspace get vmevent_event by reading fd, it could enumerate
> several attribute all at once.
> Then, one of attribute(call A) made by vmevent_match in kernel and other attributes(call B, C, D)
> are just extra for convenience. Because there is time gap when kernel get attribute values, B,C,D could be stale.
> Then, how can user determine which event is really triggered? A or B or C or D?
> Which event really happens?

Right. Mark the matching values with something like
VMEVENT_ATTR_STATE_CAPTURED should be sufficient?
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