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add page-rice: page(1) performance fixes

- actually allow NPROC simultaneous loadpage processes
- allow procs to skip pages currently being loaded by others
- immediately fork NPROC times after adding all pages at startup as a quick hack

--- /dev/null

+++ b/page-rice

@@ -1,0 +1,51 @@

+diff 6e64d30454f71ecda88dba1bd792e97509115d73 uncommitted

+--- a//sys/src/cmd/page.c

++++ b//sys/src/cmd/page.c

+@@ -951,7 +951,8 @@

+ loadpages(Page *p, int oviewgen)

+ {

+ 	while(p != nil && viewgen == oviewgen){

+-		qlock(p);

++		if(!canqlock(p))

++			goto next;

+ 		loadpage(p);

+ 		if(viewgen != oviewgen){

+ 			unloadpage(p);

+@@ -974,6 +975,7 @@

+ 		qunlock(p);

+ 		if(p != current && imemsize >= imemlimit)

+ 			break;		/* only one page ahead once we reach the limit */

++	next:

+ 		if(forward < 0){

+ 			if(p->up == nil || p->up->down == p)

+ 				break;

+@@ -1309,16 +1311,17 @@

+ 	writeaddr(p, "/dev/label");

+ 	current = p;

+ 	oviewgen = viewgen;

++	if(nproc >= NPROC)

++		waitpid();

+ 	switch(rfork(RFPROC|RFMEM)){

+ 	case -1:

+ 		sysfatal("rfork: %r");

+ 	case 0:

+ 		loadpages(p, oviewgen);

++		nproc--;

+ 		exits(nil);

+ 	}

+-	if(++nproc >= NPROC)

+-		if(waitpid() > 0)

+-			nproc--;

++	nproc++;

+ }

+ 

+ /* recursive display lock, called from main proc only */

+@@ -1691,6 +1694,8 @@

+ 		addpage(root, "stdin", popenfile, strdup("/fd/0"), -1);

+ 	for(; *argv; argv++)

+ 		addpage(root, *argv, popenfile, strdup(*argv), -1);

++	for(i=0; i<NPROC; i++)

++		showpage(current);

+ 

+ 	drawlock(1);

+ 	for(;;){