From 74c43b6ec832dc947037eb61661c82ea91815b31 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 23 Nov 1993 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1993-11-23

---
 port/portfns.h |  1 +
 port/proc.c    | 30 ++++++++++++++++++++++++++++++
 port/swap.c    |  2 ++
 3 files changed, 33 insertions(+)

diff --git a/port/portfns.h b/port/portfns.h
index beea71666ee8463da8d3a8744190c14c8b2830a7..d8abdce25c71dba877558290b6594a58d1d12e71 100644
--- a/port/portfns.h
+++ b/port/portfns.h
@@ -107,6 +107,7 @@ void		kbdrepeat(int);
 long		keyread(char*, int, long);
 long		keywrite(char*, int);
 void		kickpager(void);
+void		killbig(void);
 int		kprint(char*, ...);
 void		kproc(char*, void(*)(void*), void*);
 void		kprocchild(Proc*, void (*)(void*), void*);
diff --git a/port/proc.c b/port/proc.c
index 5938e8902c6185546b4b5f268d26270555ed6360..26d3820923a3850e52221418fe4e7c999bee4e4d 100644
--- a/port/proc.c
+++ b/port/proc.c
@@ -798,3 +798,33 @@ exhausted(char *resource)
 	sprint(buf, "no free %s", resource);
 	error(buf);
 }
+
+void
+killbig(void)
+{
+	int i;
+	Segment *s;
+	ulong l, max;
+	Proc *p, *ep, *kp;
+
+	max = 0;
+	kp = 0;
+	ep = procalloc.arena+conf.nproc;
+	for(p = procalloc.arena; p < ep; p++) {
+		if(p->state == Dead || p->kp)
+			continue;
+		l = 0;
+		for(i=1; i<NSEG; i++){
+			s = p->seg[i];
+			if(s)
+				l += s->top - s->base;
+		}
+		if(l > max) {
+			kp = p;
+			max = l;
+		}
+	}
+	print("%d: %s killed because no swap configured", kp->pid, kp->text);
+	kp->procctl = Proc_exitme;
+	postnote(kp, 1, "killed: proc too big", NExit);
+}
diff --git a/port/swap.c b/port/swap.c
index 3dd2b669d7fc2739acb116fa850167d8f04e3848..d235a1a0d09dd5cdebb805ab15bd071e5db42da1 100644
--- a/port/swap.c
+++ b/port/swap.c
@@ -154,6 +154,8 @@ loop:
 		else {
 			if(!cpuserver)
 				freebroken();	/* can use the memory */
+			else
+				killbig();
 
 			/* Emulate the old system if no swap channel */
 			print("no physical memory\n");