On Fri, Mar 04, 2016 at 09:12:12AM +0000, Li, Liang Z wrote: > > Although I wonder which is cheaper; that would be fairly expensive for the > > guest wouldn't it? And you'd somehow have to kick the guest before > > migration to do the ballooning - and how long would you wait for it to finish? > > About 5 seconds for an 8G guest, balloon to 1G. Get the free pages bitmap take about 20ms > for an 8G idle guest. > > Liang Where is the time spent though? allocating within guest? Or passing the info to host? If the former, we can use existing inflate/deflate vqs: Have guest put each free page on inflate vq, then on deflate vq. -- MST -- 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>