Hi Gleb,

On Tue, Jan 19, 2010 at 9:52 AM, Gleb Natapov [off-list ref] wrote:

quoted

It would be probably useful if you could point us to the application
source code that actually wants this feature.

This is two line patch to qemu that calls mlockall(MCL_CURRENT|MCL_FUTURE)
at the beginning of the main() and changes guest memory allocation to
use MAP_UNLOCKED flag. All alternative solutions in this thread suggest
that I should rewrite qemu + all library it uses. You see why I can't
take them seriously?

Well, that's not going to be portable, is it, so the application
design would still be broken, no? Did you try using (or extending)
posix_madvise(MADV_DONTNEED) for the guest address space? It seems to
me that you're trying to use a big hammer (mlock) when a polite hint
for the VM would probably be sufficient for it do its job.

                        Pekka