flag to only migrate exec's (not on by default)

8a1a20a6 · Nickolai Zeldovich · 4947af9c · 8a1a20a6
--- a/kernel/sched.cc
+++ b/kernel/sched.cc
@@ -13,6 +13,7 @@
 #include "vm.hh"

 enum { sched_debug = 0 };
+enum { steal_nonexec = 1 };

 struct runq {
  STAILQ_HEAD(queue, proc) q;
@@ -137,7 +138,7 @@ steal(void)

  pushcli();

-  for (int nonexec = 0; nonexec < 2; nonexec++) { 
+  for (int nonexec = 0; nonexec < (steal_nonexec ? 2 : 1); nonexec++) { 
    for (int i = 1; i < ncpu; i++) {
      struct runq *q = &runq[(i+mycpu()->id) % ncpu];
      struct proc *p;