Turns off syscall emulation patch for ptrace (SYSEMU) on.  SYSEMU is a
performance-patch introduced by Laurent Vivier.  It changes behaviour of
ptrace() and helps reducing host context switch rate.  To make it working, you
need a kernel patch for your host, too.  See
http://perso.wanadoo.fr/laurent.vivier/UML/ for further information.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>