To clarify: custom kernel == vanilla Linux kernel, i.e. not distribution kernel.
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/687733 Title: Linux KSM not compiled in (MADV_MERGEABLE always undef) Status in QEMU: New Bug description: Linux KSM support is not enabled because MADV_MERGEABLE remains undefined. It seems that asm-generic/mman-common.h is not included. Maybe some kind of header dependency problem? Adding #include <asm-generic/mman-common.h> to exec.c of qemu-kvm-0.13.0 enables use of KSM and values change in /sys/kernel/mm/ksm/. Tested under CentOS 5.5 with custom kernel 2.6.32.26 and OpenSUSE 11.2 with custom kernel 2.6.36.1, both x86_64 platform. Please note that I configure with--kerneldir=/lib/modules/2.6.../build and even --extra-cflags="-I/lib/modules/2.6.../build/include".