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Date: Mon, 04 Jun 2012 15:50:28 -0400
From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
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To: Minchan Kim <minchan@kernel.org>
CC: Pekka Enberg <penberg@kernel.org>,
        Anton Vorontsov <cbouatmailru@gmail.com>,
        KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
        Leonid Moiseichuk <leonid.moiseichuk@nokia.com>,
        John Stultz <john.stultz@linaro.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org,
        patches@linaro.org, kernel-team@android.com
Subject: Re: [PATCH 0/5] Some vmevent fixes...
References: <20120504073810.GA25175@lizard> <CAOJsxLH_7mMMe+2DvUxBW1i5nbUfkbfRE3iEhLQV9F_MM7=eiw@mail.gmail.com> <CAHGf_=qcGfuG1g15SdE0SDxiuhCyVN025pQB+sQNuNba4Q4jcA@mail.gmail.com> <20120507121527.GA19526@lizard> <4FA82056.2070706@gmail.com> <CAOJsxLHQcDZSHJZg+zbptqmT9YY0VTkPd+gG_zgMzs+HaV_cyA@mail.gmail.com> <CAHGf_=q1nbu=3cnfJ4qXwmngMPB-539kg-DFN2FJGig8+dRaNw@mail.gmail.com> <CAOJsxLFAavdDbiLnYRwe+QiuEHSD62+Sz6LJTk+c3J9gnLVQ_w@mail.gmail.com> <CAHGf_=pSLfAue6AR5gi5RQ7xvgTxpZckA=Ja1fO1AkoO1o_DeA@mail.gmail.com> <CAOJsxLG1+zhOKgi2Rg1eSoXSCU8QGvHVED_EefOOLP-6JbMDkg@mail.gmail.com> <20120601122118.GA6128@lizard> <alpine.LFD.2.02.1206032125320.1943@tux.localdomain> <4FCC7592.9030403@kernel.org>
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> KOSAKI, AFAIRC, you are a person who hates android low memory killer.
> Why do you hate it? If it solve problems I mentioned, do you have a concern, still?
> If so, please, list up.

1) it took tasklist_lock. (it was solved already)
2) hacky lowmem_deathpending_timeout
3) No ZONE awareness. global_page_state(), lowmem_minfree[] and shrink_slab interface
    don't realize real memory footprint.
4) No memcg, cpuset awareness.
5) strange score calculation. the score is calculated from anon_rss+file_rss,
    but oom killer only free anon_rss.
6) strange oom_score_adj overload
7) much duplicate code w/ oom_killer. we can make common helper function, I think.
8) John's fallocate(VOLATILE) is more cleaner.