From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Anton Vorontsov" <anton.vorontsov@linaro.org>,
"KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
"Arve Hjønnevåg" <arve@android.com>,
"Rik van Riel" <riel@redhat.com>, "Pavel Machek" <pavel@ucw.cz>,
"Greg Kroah-Hartman" <gregkh@suse.de>,
"Andrew Morton" <akpm@linux-foundation.org>,
"David Rientjes" <rientjes@google.com>,
"Michal Hocko" <mhocko@suse.cz>,
"John Stultz" <john.stultz@linaro.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: Android low memory killer vs. memory pressure notifications
Date: Mon, 19 Dec 2011 11:16:32 -0500 [thread overview]
Message-ID: <4EEF6360.4000306@gmail.com> (raw)
In-Reply-To: <20111219103954.354d68af@pyramind.ukuu.org.uk>
(12/19/11 5:39 AM), Alan Cox wrote:
>> The main downside of this approach is that mem_cg needs 20 bytes per
>> page (on a 32 bit machine). So on a 32 bit machine with 4K pages
>> that's approx. 0.5% of RAM, or, in other words, 5MB on a 1GB machine.
>
> The obvious question would be why? Would fixing memcg make more sense ?
Just historical reason. Initial memcg implement by IBM was just crap.
People need very long time to fix it.
> The only problem I see with having a user space manager is that manager
> probably has to be mlock to avoid awkward fail cases and that may in fact
> make it smaller kernel side.
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next prev parent reply other threads:[~2011-12-19 16:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-19 2:53 Android low memory killer vs. memory pressure notifications Anton Vorontsov
2011-12-19 7:48 ` Minchan Kim
2011-12-19 19:05 ` David Rientjes
2011-12-19 10:39 ` Alan Cox
2011-12-19 16:16 ` KOSAKI Motohiro [this message]
2011-12-19 16:24 ` Rik van Riel
2011-12-19 12:12 ` Michal Hocko
2011-12-19 19:12 ` David Rientjes
2011-12-20 14:56 ` Anton Vorontsov
2011-12-20 21:36 ` David Rientjes
2011-12-21 0:28 ` Anton Vorontsov
2011-12-21 1:14 ` Frank Rowand
2011-12-21 2:07 ` Anton Vorontsov
2011-12-21 2:30 ` Frank Rowand
2011-12-21 23:41 ` Anton Vorontsov
2011-12-22 1:16 ` KOSAKI Motohiro
2011-12-22 18:53 ` Frank Rowand
2011-12-21 2:50 ` David Rientjes
2011-12-20 2:16 ` Anton Vorontsov
2011-12-19 16:11 ` KOSAKI Motohiro
2011-12-20 0:30 ` Hiroyuki Kamezawa
2011-12-19 17:30 ` KOSAKI Motohiro
2011-12-19 17:34 ` KOSAKI Motohiro
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