Re: [Qemu-devel] [PATCH 0/7] userfault21 update

[Patrick Donnelly]

Hello Andrea,

On Mon, Jun 15, 2015 at 1:22 PM, Andrea Arcangeli <address@hidden> wrote:
> This is an incremental update to the userfaultfd code in -mm.

Sorry I'm late to this party. I'm curious how a ptrace monitor might
use a userfaultfd to handle faults in all of its tracees. Is this
possible without having each (newly forked) tracee "cooperate" by
creating a userfaultfd and passing that to the tracer?

Have you considered using one userfaultfd for an entire tree of
processes (signaled through a flag)? Would not a process id included
in the include/uapi/linux/userfaultfd.h:struct uffd_msg be sufficient
to disambiguate faults?

-- 
Patrick Donnelly