This might be about RAM-constrained phones; the design doc refers to '--optimize-for-size devices', suggesting it won't (initially?) be on for everyone. Android and Chrome OS already enable Linux zram to get more out of low-memory gadgets. Incidentally, Google announced a (to me very ambitious-sounding) push for $50 Android phones today (http://www.engadget.com/2015/08/10/google-revamps-android-on...) that better low-RAM support could mesh nicely with, though of course it's just a coincidence the dates lined up.
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This might be about RAM-constrained phones; the design doc refers to '--optimize-for-size devices', suggesting it won't (initially?) be on for everyone. Android and Chrome OS already enable Linux zram to get more out of low-memory gadgets. Incidentally, Google announced a (to me very ambitious-sounding) push for $50 Android phones today (http://www.engadget.com/2015/08/10/google-revamps-android-on...) that better low-RAM support could mesh nicely with, though of course it's just a coincidence the dates lined up.