Minchan Kim wrote: > Hi, > > On Fri, Aug 16, 2013 at 10:02:08AM +0800, Wanpeng Li wrote: >> Hi Minchan, >> On Thu, Aug 15, 2013 at 01:17:53AM +0900, Minchan Kim wrote: >> >Hi Luigi, >> > >> >On Wed, Aug 14, 2013 at 08:53:31AM -0700, Luigi Semenzato wrote: >> >If you have real swap storage, zswap might be better although I have >> >no number but real swap is money for embedded system and it has sudden >> >garbage collection on firmware side if we use eMMC or SSD so that it >> >could affect system latency. Morever, if we start to use real swap, >> >maybe we should encrypt the data and it would be severe overhead(CPU >> >and Power). >> > >> >> Why real swap for embedded system need encrypt the data? I think there >> is no encrypt for data against server and desktop. > > I have used some portable device but suddenly, I lost it or was stolen. > A hacker can pick it up and read my swap and found my precious > information. I don't want it. I guess it's one of reason ChromeOS don't > want to use real swap. > > https://groups.google.com/a/chromium.org/forum/#!msg/chromium-os-discuss/92Fvi4Ezego/ZvbrC3L2FG4J This is when you use dm-crypt. Also, as noted by others, zswap with a fake backing device that always returns failure (and thus never stores data on disk) should behave like zram without any physical swap. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>