On Mon, Apr 18, 2016 at 11:08:31AM +0000, Li, Liang Z wrote: > Hi Dave, > > I am now working on how to benefit post-copy by skipping the free pages, > and I remember you have said we should let the destination know the info > of free pages so as to avoid request the free pages from the source. > > We have two solutions: > > a. send the migration dirty page bitmap to destination before post > copy start, so the destination can decide whether to request the pages or > place zero pages by checking the migration dirty page bitmap. The advantage > is that we can avoid sending the free pages. the disadvantage is that we have > to send extra data to destination. > > b. Check the page request on the source side, if it's not a dirty page, send a zero > page header to the destination. > > What's your opinion about them? > > Liang > Both are ad-hoc solutions imho. c. put the bitmap in a ramblock, check it on destination before requesting pages. This way it's migrated on-demand. -- MST -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
