Il 04/06/2013 16:48, Peter Lieven ha scritto: > Still using 3.2, but strange enough the above example is also not > increasing RSS size for me. > > Can you try the following: > qemu git master with 1G of memory (hanging in bios with no boot device) > and migrate it. Before migration RSS Size os somewhat > around 16MB. After migration its RSS size is in the order of 1G.
That may be a kernel bug. The kernel did not do the copy-on-write trick on huge zero pages. It was fixed last year, maybe 3.2 is not enough. Try adding a MADV_HUGEPAGE madvise to the testcase and see if it reproduces. Paolo
