Andrea Arcangeli wrote:
On Fri, Aug 01, 2008 at 02:47:39PM -0500, Anthony Liguori wrote:
Is there a way to detect MMU notifiers from userspace? I don't think it's
currently safe to madvise unconditionally.
There is no way to detect mmu notifiers from userspace (well strictly
speaking you could check /proc/kallsyms) but the point is that without
mmu notifiers madvise won't be enough (the memory may not be freed
without the other ioctl proposed by Marcelo that also flushes sptes).
Right. Ideally, I'd like to just disable the balloon device if mmu
notifiers *and* kvm support for it are not present. If you're saying
there is no way to probe for this now from userspace, then that's
something we need to add.
Regards,
Anthony Liguori
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