From: Tomas Hruby <tom@minix3.org>
Date: Fri, 18 Jun 2010 14:01:34 +0000 (+0000)
Subject: Cycle counters zeroed after fork for the child
X-Git-Tag: v3.1.8~439
X-Git-Url: http://zhaoyanbai.com/repos/Bv9ARM.ch11.html?a=commitdiff_plain;h=6bc21b699274ccef38ce01a099fd4a6f2e5703d3;p=minix.git

Cycle counters zeroed after fork for the child
---

diff --git a/kernel/system/do_fork.c b/kernel/system/do_fork.c
index 4a1180cc6..248d18f7c 100644
--- a/kernel/system/do_fork.c
+++ b/kernel/system/do_fork.c
@@ -15,6 +15,7 @@
 #include <assert.h>
 
 #include <minix/endpoint.h>
+#include <minix/u64.h>
 
 #if USE_FORK
 
@@ -94,6 +95,9 @@ PUBLIC int do_fork(struct proc * caller, message * m_ptr)
   if (rpc->p_scheduler)
 	  RTS_SET(rpc, RTS_NO_QUANTUM);
 
+  make_zero64(rpc->p_cpu_time_left);
+  make_zero64(rpc->p_cycles);
+
   /* If the parent is a privileged process, take away the privileges from the 
    * child process and inhibit it from running by setting the NO_PRIV flag.
    * The caller should explicitely set the new privileges before executing.