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? -- 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>