[libvirt] [PATCH] virsh: Enhance documentation of --rdma-pin-all option

https://bugzilla.redhat.com/show_bug.cgi?id=1373783 Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- tools/virsh.pod | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/virsh.pod b/tools/virsh.pod index 01453be600..a03f64a262 100644 --- a/tools/virsh.pod +++ b/tools/virsh.pod @@ -1767,7 +1767,13 @@ periodically increased by I<auto-converge-increment>. I<--rdma-pin-all> can be used with RDMA migration (i.e., when I<migrateuri> starts with rdma://) to tell the hypervisor to pin all domain's memory at once -before migration starts rather than letting it pin memory pages as needed. +before migration starts rather than letting it pin memory pages as needed. For +QEMU/KVM this requires hard_limit memory tuning element (in the domain XML) to +be used and set to the maximum memory configured for the domain plus any memory +consumed by the QEMU process itself. Beware of setting the memory limit too +high (and thus allowing the domain to lock most of the host's memory). Doing so +may be dangerous to both the domain and the host itself since the host's kernel +may run out of memory. B<Note>: Individual hypervisors usually do not support all possible types of migration. For example, QEMU does not support direct migration. -- 2.14.1