this little patch documents a point in the scheduler where many people
seem to get confused.
===== kernel/sched.c 1.140 vs edited =====
--- 1.140/kernel/sched.c Mon Oct 14 10:30:06 2002
+++ edited/kernel/sched.c Wed Oct 16 17:28:29 2002
@@ -1035,6 +1035,12 @@
prepare_arch_switch(rq, next);
prev = context_switch(prev, next);
+ /*
+ * Kernelnewbies hint: at this point the current process
+ * has switched from prev to next. Prev is sitting on the
+ * run queue and next unlocks the runqueue, either here or
+ * in ret_from_fork (for newly forked processes).
+ */
barrier();
rq = this_rq();
finish_arch_switch(rq, prev);
Rik
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