[PATCH] ovs-vswitchd: Call mlockall() from the daemon, not the parent or monitor.

mlockall(2) says:

       Memory  locks  are not inherited by a child created via fork(2) and are
       automatically removed  (unlocked)  during  an  execve(2)  or  when  the
       process terminates.

which means that --mlockall was ineffective in combination with --detach
or --monitor or both.  Both are used in the most common production
configuration of Open vSwitch, so this means that --mlockall has never been
effective in production.

Signed-off-by: Ben Pfaff <blp@...>
---
 vswitchd/ovs-vswitchd.c |   22 +++++++++++++++-------
 1 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/vswitchd/ovs-vswitchd.c b/vswitchd/ovs-vswitchd.c
index 8ef3b10..6062a40 100644
--- a/vswitchd/ovs-vswitchd.c
+++ b/vswitchd/ovs-vswitchd.c
 <at>  <at>  -55,6 +55,10  <at>  <at> 

 VLOG_DEFINE_THIS_MODULE(vswitchd);

+/* --mlockall: If set, locks all process memory into physical RAM, preventing
+ * the kernel from paging any of its memory to disk. */
+static bool want_mlockall;
+
 static unixctl_cb_func ovs_vswitchd_exit;