Re: [PATCH v6] memcg: event control at vmpressure.

From: Anton Vorontsov <anton@enomsg.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@suse.cz>,
	Hyunhee Kim <hyunhee.kim@samsung.com>,
	linux-mm@kvack.org, akpm@linux-foundation.org, rob@landley.net,
	kamezawa.hiroyu@jp.fujitsu.com, hannes@cmpxchg.org,
	rientjes@google.com, kirill@shutemov.name,
	'Kyungmin Park' <kyungmin.park@samsung.com>
Subject: Re: [PATCH v6] memcg: event control at vmpressure.
Date: Fri, 21 Jun 2013 17:27:44 -0700	[thread overview]
Message-ID: <20130622002744.GA29172@lizard.mcd26095.sjc.wayport.net> (raw)
In-Reply-To: <20130621164413.GA4759@gmail.com>

On Sat, Jun 22, 2013 at 01:44:14AM +0900, Minchan Kim wrote:
[...]
> 3. The reclaimed could be greater than scanned in vmpressure_evnet
>    by several reasons. Totally, It could trigger wrong event.

Yup, and in that case the best we can do is just ignore the event (i.e.
not pass it to the userland): thing is, based on the fact that
'reclaimed > scanned' we can't actually conclude anything about the
pressure: it might be still high, or we actually freed enough.

Thanks,

Anton

p.s. I was somewhat sure that someone sent a patch to ignore 'reclaimed >
scanned' situation, but I cannot find it in my mailbox. Maybe I was
dreaming about it? :)

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