ref: 45adb253790f75a5d55d7b42a1e8da1c05989c03
parent: 7caa9585434c771bea1aaf6d3317b969df5afa9d
author: qwx <qwx@sciops.net>
date: Wed Jan 12 20:36:20 EST 2022
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(;;){