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kernel: various cleanups of imagereclaim(), pagereclaim(), freepages(), putimage()

imagereclaim(), pagereclaim():
- move imagereclaim() and pagereclaim() declarations to portfns.h
- consistently use ulong type for page counts
- name number of pages to free "pages" instead of "min"
- check for pages == 0 on entry

freepages():
- move pagechaindone() call to wakeup newpage() consumers inside
  palloc critical section.

putimage():
- use long type for refcount

--- a/sys/src/9/port/page.c

+++ b/sys/src/9/port/page.c

@@ -83,23 +83,26 @@

 }

 static void

-freepages(Page *head, Page *tail, int n)

+freepages(Page *head, Page *tail, ulong np)

 {

 	lock(&palloc);

 	tail->next = palloc.head;

 	palloc.head = head;

-	palloc.freecount += n;

-	unlock(&palloc);

+	palloc.freecount += np;

 	pagechaindone();

+	unlock(&palloc);

 }

-int

-pagereclaim(Image *i, int min)

+ulong

+pagereclaim(Image *i, ulong pages)

 {

 	Page **h, **l, **x, *p;

 	Page *fh, *ft;

-	int n;

+	ulong np;

+	if(pages == 0)

+		return 0;

+

 	lock(i);

 	if(i->pgref == 0){

 		unlock(i);

@@ -107,7 +110,7 @@

 	}

 	incref(i);

-	n = 0;

+	np = 0;

 	fh = ft = nil;

 	for(h = i->pghash; h < &i->pghash[PGHSIZE]; h++){

 		l = h;

@@ -133,16 +136,16 @@

 		else

 			ft->next = p;

 		ft = p;

-		if(++n >= min)

+		if(++np >= pages)

 			break;

 	}

 	unlock(i);

 	putimage(i);

-	if(n > 0)

-		freepages(fh, ft, n);

+	if(np > 0)

+		freepages(fh, ft, np);

-	return n;

+	return np;

 }

 static int

--- a/sys/src/9/port/portfns.h

+++ b/sys/src/9/port/portfns.h

@@ -131,6 +131,7 @@

 void		ilock(Lock*);

 void		interrupted(void);

 void		iunlock(Lock*);

+ulong		imagereclaim(ulong);

 long		incref(Ref*);

 void		initseg(void);

 int		iprint(char*, ...);

@@ -204,7 +205,8 @@

 void		pagechaindone(void);

 void		pagechainhead(Page*);

 void		pageinit(void);

-ulong	pagenumber(Page*);

+ulong		pagenumber(Page*);

+ulong		pagereclaim(Image*, ulong);

 void		pagersummary(void);

 void		panic(char*, ...);

 Cmdbuf*		parsecmd(char *a, int n);

--- a/sys/src/9/port/segment.c

+++ b/sys/src/9/port/segment.c

@@ -5,8 +5,6 @@

 #include	"fns.h"

 #include	"../port/error.h"

-int imagereclaim(int);

-

 /*

  * Attachable segment types

  */

@@ -295,20 +293,22 @@

 	return i;

 }

-extern int pagereclaim(Image*, int);	/* page.c */

-

-int

-imagereclaim(int min)

+ulong

+imagereclaim(ulong pages)

 {

 	static Image *i, *ie;

-	int j, n;

+	ulong np;

+	int j;

+	if(pages == 0)

+		return 0;

+

 	eqlock(&imagealloc.ireclaim);

 	if(i == nil){

 		i = imagealloc.list;

 		ie = &imagealloc.list[conf.nimage];

 	}

-	n = 0;

+	np = 0;

 	for(j = 0; j < conf.nimage; j++, i++){

 		if(i >= ie)

 			i = imagealloc.list;

@@ -319,14 +319,14 @@

 		 * reclaim pages from inactive images.

 		 */

 		if(imagealloc.free != nil || i->ref == i->pgref){

-			n += pagereclaim(i, min - n);

-			if(n >= min)

+			np += pagereclaim(i, pages - np);

+			if(np >= pages)

 				break;

 		}

 	}

 	qunlock(&imagealloc.ireclaim);

-	return n;

+	return np;

 }

 void

@@ -334,7 +334,7 @@

 {

 	Image *f, **l;

 	Chan *c;

-	int r;

+	long r;

 	if(i->notext){

 		decref(i);

--- a/sys/src/9/port/swap.c

+++ b/sys/src/9/port/swap.c

@@ -118,25 +118,22 @@

 		kproc("pager", pager, 0);

 }

-extern int pagereclaim(Image*,int);	/* page.c */

-extern int imagereclaim(int);		/* segment.c */

-

 static int

 reclaim(void)

 {

-	int n;

+	ulong np;

 	for(;;){

-		if((n = pagereclaim(&fscache, 1000)) > 0) {

-			if(0) print("reclaim: %d fscache\n", n);

-		} else if((n = pagereclaim(&swapimage, 1000)) > 0) {

-			if(0) print("reclaim: %d swap\n", n);

-		} else if((n = imagereclaim(1000)) > 0) {

-			if(0) print("reclaim: %d image\n", n);

+		if((np = pagereclaim(&fscache, 1000)) > 0) {

+			if(0) print("reclaim: %lud fscache\n", np);

+		} else if((np = pagereclaim(&swapimage, 1000)) > 0) {

+			if(0) print("reclaim: %lud swap\n", np);

+		} else if((np = imagereclaim(1000)) > 0) {

+			if(0) print("reclaim: %lud image\n", np);

 		}

 		if(!needpages(nil))

 			return 1;	/* have pages, done */

-		if(n == 0)

+		if(np == 0)

 			return 0;	/* didnt reclaim, need to swap */

 		sched();

 	}