> * Andrea Arcangeli (aarcange@xxxxxxxxxx) wrote: > > On Fri, Apr 15, 2016 at 06:23:30PM +0300, Kirill A. Shutemov wrote: > > > The same here. Freshly booted machine with 64GiB ram. I've checked > > > /proc/vmstat: huge pages were allocated > > > > I tried the test in a loop and I can't reproduce it here. > > > > Tested with gcc 4.9.3 and glibc 2.21 and glibc 2.22 so far, > > qemu&kernel/KVM latest upstream (4.6-rc3..). > > > > You can run this in between each invocation to guarantee all memory is > > backed by THP (no need of reboot): > > > > # echo 3 >/proc/sys/vm/drop_caches > > # echo >/proc/sys/vm/compact_memory > > > > 4.5 kernel built with gcc 5.3.1 run on a older userland worked fine > > too. > > > > Next thing to test would be if there's something wrong with qemu built > > with gcc 5.3.1 if run on top of a 4.4 kernel? > > It's also working for me on f24 (4.5.0-320 packaged kernel) on a real machine; > so we currently have two sets that break: > > a) Liang Li's setup (that breaks with the migrate of a real VM but I don't > think we have any details of the setup); > works with 4.4.x breaks with 4.5.x > The host OS is Centos 7, I just replace the kernel with 4.4/4.5, I can provide the .config for the kernel if you think it's helpful. The guest OS is CentOS6.6, 2.6.32-504.el6.x86_64 Liang > b) f24 nested with my test, with THP enabled after Kirill's changes. > > Dave > > -- > Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK -- 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