stats: show amount of reclaimable pages (add -r flag)

reclaimable pages are user pages that are used for
caches like the image cache, mount cache and swap cache.

sys/man/8/stats

@@ -39,6 +39,9 @@ percentage battery life remaining.
 .B "c context
 number of process context switches per second.
 .TP
+.B "d draw
+draw memory allocation size in bytes.
+.TP
 .B 
 .B "e ether
 total number of packets sent and received per second.
@@ -58,6 +61,9 @@ system load, % time in idle, and % time in interrupts.
 The last two are averaged over all processors on a
 multiprocessor.
 .TP
+.B "k kern
+kernel memory allocation size in bytes.
+.TP
 .B "l load
 (default) system load average.
 The load is computed as a running average of
@@ -68,19 +74,17 @@ total pages of active memory.
 The graph displays the fraction
 of the machine's total memory in use.
 .TP
-.B "k kern
-kernel memory allocation size in bytes.
-.TP
-.B "d draw
-draw memory allocation size in bytes.
-.TP
-.B 
 .B "n etherin,out,err
 number of packets sent and received per second, and total number of errors, displayed as separate graphs.
 .TP
 .B "p tlbpurge
 number of translation lookaside buffer flushes per second.
 .TP
+.B "r reclaim 
+total pages of reclaimable memory.
+The graph displays the fraction
+of the machine's total memory in use.
+.TP
 .B "s syscall
 number of system calls per second.
 .TP

sys/src/9/port/devswap.c

@@ -517,25 +517,29 @@ static long
 swapread(Chan *c, void *va, long n, vlong off)
 {
 	char tmp[256];		/* must be >= 18*NUMSIZE (Qswap) */
+	ulong reclaim;
 
 	switch((ulong)c->qid.path){
 	case Qdir:
 		return devdirread(c, va, n, swapdir, nelem(swapdir), devgen);
 	case Qswap:
+		reclaim = imagecached() + fscache.pgref + swapimage.pgref;
 		snprint(tmp, sizeof tmp,
 			"%llud memory\n"
 			"%llud pagesize\n"
 			"%lud kernel\n"
 			"%lud/%lud user\n"
 			"%lud/%lud swap\n"
+			"%lud/%lud reclaim\n"
 			"%llud/%llud/%llud kernel malloc\n"
 			"%llud/%llud/%llud kernel draw\n"
 			"%llud/%llud/%llud kernel secret\n",
 			(uvlong)conf.npage*BY2PG,
 			(uvlong)BY2PG,
 			conf.npage-conf.upages,
-			palloc.user-palloc.freecount-fscache.pgref-swapimage.pgref, palloc.user,
+			palloc.user-palloc.freecount-reclaim, palloc.user,
 			conf.nswap-swapalloc.free, conf.nswap,
+			reclaim, palloc.user,
 			(uvlong)mainmem->curalloc,
 			(uvlong)mainmem->cursize,
 			(uvlong)mainmem->maxsize,

sys/src/9/port/portfns.h

@@ -133,6 +133,7 @@ uintptr		ibrk(uintptr, int);
 void		ilock(Lock*);
 void		interrupted(void);
 void		iunlock(Lock*);
+ulong		imagecached(void);
 ulong		imagereclaim(ulong);
 long		incref(Ref*);
 void		initseg(void);

sys/src/9/port/segment.c

@@ -296,6 +296,19 @@ found:
 	return i;
 }
 
+ulong
+imagecached(void)
+{
+	Image *i, *ie;
+	ulong np;
+
+	np = 0;
+	ie = &imagealloc.list[conf.nimage];
+	for(i = imagealloc.list; i < ie; i++)
+		np += i->pgref;
+	return np;
+}
+
 ulong
 imagereclaim(ulong pages)
 {

sys/src/cmd/stats.c

@@ -26,12 +26,13 @@ struct Graph
 
 enum
 {
-	/* old /dev/swap */
+	/* /dev/swap */
 	Mem		= 0,
 	Maxmem,
 	Swap,
 	Maxswap,
-
+	Reclaim,
+	Maxreclaim,
 	Kern,
 	Maxkern,
 	Draw,
@@ -48,6 +49,7 @@ enum
 	Load,
 	Idle,
 	InIntr,
+
 	/* /net/ether0/stats */
 	In		= 0,
 	Link,
@@ -69,7 +71,7 @@ struct Machine
 	int		tempfd;
 	int		disable;
 
-	uvlong		devswap[8];
+	uvlong		devswap[10];
 	uvlong		devsysstat[10];
 	uvlong		prevsysstat[10];
 	int		nproc;
@@ -120,6 +122,7 @@ enum Menu2
 	Mload,
 	Mmem,
 	Mswap,
+	Mreclaim,
 	Mkern,
 	Mdraw,
 	Msyscall,
@@ -144,6 +147,7 @@ char	*menu2str[Nmenu2+1] = {
 	"add  load    ",
 	"add  mem     ",
 	"add  swap    ",
+	"add  reclaim ",
 	"add  kern    ",
 	"add  draw    ",
 	"add  syscall ",
@@ -167,6 +171,7 @@ void	contextval(Machine*, uvlong*, uvlong*, int),
 	idleval(Machine*, uvlong*, uvlong*, int),
 	memval(Machine*, uvlong*, uvlong*, int),
 	swapval(Machine*, uvlong*, uvlong*, int),
+	reclaimval(Machine*, uvlong*, uvlong*, int),
 	kernval(Machine*, uvlong*, uvlong*, int),
 	drawval(Machine*, uvlong*, uvlong*, int),
 	syscallval(Machine*, uvlong*, uvlong*, int),
@@ -192,6 +197,7 @@ void	(*newvaluefn[Nmenu2])(Machine*, uvlong*, uvlong*, int init) = {
 	loadval,
 	memval,
 	swapval,
+	reclaimval,
 	kernval,
 	drawval,
 	syscallval,
@@ -205,7 +211,7 @@ Image	*cols[Ncolor][3];
 Graph	*graph;
 Machine	*mach;
 char	*mysysname;
-char	argchars[] = "8bcdeEfiIkmlnpstwz";
+char	argchars[] = "8bcdeEfiIkmlnprstwz";
 int	pids[NPROC];
 int 	parity;	/* toggled to avoid patterns in textured background */
 int	nmach;
@@ -465,42 +471,58 @@ readnums(Machine *m, int n, uvlong *a, int spanlines)
 int
 readswap(Machine *m, uvlong *a)
 {
+	static int xxx = 0;
+
 	if(strstr(m->buf, "memory\n")){
 		/* new /dev/swap - skip first 3 numbers */
 		if(!readnums(m, 7, a, 1))
 			return 0;
-		a[0] = a[3];
-		a[1] = a[4];
-		a[2] = a[5];
-		a[3] = a[6];
 
-		a[4] = 0;
-		a[5] = 0;
+		a[Mem] = a[3];
+		a[Maxmem] = a[4];
+		a[Swap] = a[5];
+		a[Maxswap] = a[6];
+
+		a[Reclaim] = 0;
+		a[Maxreclaim] = 0;
+		if(m->bufp = strstr(m->buf, "reclaim")){
+			while(m->bufp > m->buf && m->bufp[-1] != '\n')
+				m->bufp--;
+			a[Reclaim] = strtoull(m->bufp, &m->bufp, 10);
+			while(*m->bufp++ == '/')
+				a[Maxreclaim] = strtoull(m->bufp, &m->bufp, 10);
+		}
+
+		a[Kern] = 0;
+		a[Maxkern] = 0;
 		if(m->bufp = strstr(m->buf, "kernel malloc")){
 			while(m->bufp > m->buf && m->bufp[-1] != '\n')
 				m->bufp--;
-			a[4] = strtoull(m->bufp, &m->bufp, 10);
+			a[Kern] = strtoull(m->bufp, &m->bufp, 10);
 			while(*m->bufp++ == '/')
-				a[5] = strtoull(m->bufp, &m->bufp, 10);
+				a[Maxkern] = strtoull(m->bufp, &m->bufp, 10);
 		}
 
-		a[6] = 0;
-		a[7] = 0;
+		a[Draw] = 0;
+		a[Maxdraw] = 0;
 		if(m->bufp = strstr(m->buf, "kernel draw")){
 			while(m->bufp > m->buf && m->bufp[-1] != '\n')
 				m->bufp--;
-			a[6] = strtoull(m->bufp, &m->bufp, 10);
+			a[Draw] = strtoull(m->bufp, &m->bufp, 10);
 			while(*m->bufp++ == '/')
-				a[7] = strtoull(m->bufp, &m->bufp, 10);
+				a[Maxdraw] = strtoull(m->bufp, &m->bufp, 10);
 		}
 
 		return 1;
 	}
 
-	a[4] = 0;
-	a[5] = 0;
-	a[6] = 0;
-	a[7] = 0;
+	a[Reclaim] = 0;
+	a[Maxreclaim] = 0;
+	a[Kern] = 0;
+	a[Maxkern] = 0;
+	a[Draw] = 0;
+	a[Maxdraw] = 0;
+
 	return readnums(m, 4, a, 0);
 }
 
@@ -636,7 +658,7 @@ alarmed(void *a, char *s)
 int
 needswap(int init)
 {
-	return init | present[Mmem] | present[Mswap] | present[Mkern] | present[Mdraw];
+	return init | present[Mmem] | present[Mswap] | present[Mreclaim] | present[Mkern] | present[Mdraw];
 }
 
 
@@ -746,6 +768,15 @@ swapval(Machine *m, uvlong *v, uvlong *vmax, int)
 		*vmax = 1;
 }
 
+void
+reclaimval(Machine *m, uvlong *v, uvlong *vmax, int)
+{
+	*v = m->devswap[Reclaim];
+	*vmax = m->devswap[Maxreclaim];
+	if(*vmax == 0)
+		*vmax = 1;
+}
+
 void
 kernval(Machine *m, uvlong *v, uvlong *vmax, int)
 {
@@ -1327,6 +1358,9 @@ main(int argc, char *argv[])
 	case 'p':
 		addgraph(Mtlbpurge);
 		break;
+	case 'r':
+		addgraph(Mreclaim);
+		break;
 	case 's':
 		addgraph(Msyscall);
 		break;