From 6b0f33d0fc0227339bf6308f08fe358bbd70074d Mon Sep 17 00:00:00 2001
From: David van Moolenbroek <david@minix3.org>
Date: Mon, 2 Nov 2015 17:46:16 +0000
Subject: [PATCH] Kernel: per-process sleep time

Change-Id: I6e08e7db155ed6d51002f0993dbef29ca6d926d1
---
 minix/kernel/proc.c | 2 ++
 minix/kernel/proc.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/minix/kernel/proc.c b/minix/kernel/proc.c
index 7076023cd..5ca6474ad 100644
--- a/minix/kernel/proc.c
+++ b/minix/kernel/proc.c
@@ -1774,6 +1774,8 @@ void dequeue(struct proc *rp)
 	rp->p_accounting.enter_queue = 0;
   }
 
+  /* For ps(1), remember when the process was last dequeued. */
+  rp->p_dequeued = get_monotonic();
 
 #if DEBUG_SANITYCHECKS
   assert(runqueues_ok_local());
diff --git a/minix/kernel/proc.h b/minix/kernel/proc.h
index 76850cb38..200c3bdfa 100644
--- a/minix/kernel/proc.h
+++ b/minix/kernel/proc.h
@@ -54,6 +54,8 @@ struct proc {
 	unsigned long preempted;
   } p_accounting;
 
+  clock_t p_dequeued;		/* uptime at which process was last dequeued */
+
   clock_t p_user_time;		/* user time in ticks */
   clock_t p_sys_time;		/* sys time in ticks */
 
-- 
2.44.0