[Qemu-devel] [Bug 687733] Re: Linux KSM not compiled in (MADV_MERGEABLE always undef)

[Paul Brook]

Not a qemu bug. madvise and (associated constants via sys/mman.h) are
supplied by glibc. You need to update your C library.

** Changed in: qemu
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/687733

Title:
  Linux KSM not compiled in (MADV_MERGEABLE always undef)

Status in QEMU:
  Invalid

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".