Re: [PATCH 3/3] vmevent: Implement special low-memory attribute

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On Mon, May 7, 2012 at 10:19 PM, KOSAKI Motohiro
<kosaki.motohiro@xxxxxxxxx> wrote:
>> Even more, we may introduce two attributes:
>>
>> RECLAIMABLE_CACHE_PAGES and
>> RECLAIMABLE_CACHE_PAGES_NOIO (which excludes dirty pages).
>>
>> This makes ABI detached from the mm internals and still keeps a
>> defined meaning of the attributes.
>
> Collection of craps are also crap. If you want to improve userland
> notification, you should join VM improvement activity. You shouldn't
> think nobody except you haven't think userland notification feature.
>
> The problem is, Any current kernel vm statistics were not created for
> such purpose and don't fit.
>
> Even though, some inaccurate and incorrect statistics fit _your_ usecase,
> they definitely don't fit other. And their people think it is bug.

Well, yeah, if we are to report _number of pages_, the numbers better
be meaningful.

That said, I think you are being unfair to Anton who's one of the few
that's actually taking the time to implement this properly instead of
settling for an out-of-tree hack.

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