[warn]kernel lacks cgroups or memory controller not avaiable, not starting cgroups

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このやりかたが定番のようだ。

http://qiita.com/sakasa/items/47f58da8eda7d792ab10

書き換え

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bootに目障りなwarningが出る。

検索したところ

http://www.raspberrypi.org/forums/viewtopic.php?f=66&t=87080

ということのようだ。フツーの人は無問題と。曰く

I jst ignore the message as it is not important for the average user:
http://www.raspberrypi.org/web-browser-beta

""If you are feeling particularly adventurous, our new kernel supports cgroups which the browser can use to receive notification of impending out of memory (OOM) events, allowing it to preemptively deallocate resources. To enable cgroups, add the following to your kernel command line""

でも、気持ち悪い。 (笑

対処方法として

/boot/cmdline.txt に

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline cgroup_enable=memory rootwait

赤文字部分を書き足せばOK。