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Diffstat (limited to 'sys/uvm/uvm_km.c')
-rw-r--r--sys/uvm/uvm_km.c127
1 files changed, 126 insertions, 1 deletions
diff --git a/sys/uvm/uvm_km.c b/sys/uvm/uvm_km.c
index d343a59e4f9..a07be5b0b8f 100644
--- a/sys/uvm/uvm_km.c
+++ b/sys/uvm/uvm_km.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: uvm_km.c,v 1.35 2004/02/23 06:19:32 drahn Exp $ */
+/* $OpenBSD: uvm_km.c,v 1.36 2004/04/19 22:52:33 tedu Exp $ */
/* $NetBSD: uvm_km.c,v 1.42 2001/01/14 02:10:01 thorpej Exp $ */
/*
@@ -144,6 +144,7 @@
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
+#include <sys/kthread.h>
#include <uvm/uvm.h>
@@ -915,3 +916,127 @@ uvm_km_free_poolpage1(map, addr)
splx(s);
#endif /* PMAP_UNMAP_POOLPAGE */
}
+
+int uvm_km_pages_lowat;
+int uvm_km_pages_free;
+struct km_page {
+ struct km_page *next;
+} *uvm_km_pages_head;
+
+void uvm_km_createthread(void *);
+void uvm_km_thread(void *);
+
+void
+uvm_km_page_init(void)
+{
+ struct km_page *head, *page;
+ int i;
+
+
+ head = NULL;
+ for (i = 0; i < uvm_km_pages_lowat * 4; i++) {
+#if defined(PMAP_MAP_POOLPAGE)
+ struct vm_page *pg;
+ vaddr_t va;
+
+ pg = uvm_pagealloc(NULL, 0, NULL, 0);
+ if (__predict_false(pg == NULL))
+ break;
+
+ va = PMAP_MAP_POOLPAGE(pg);
+ if (__predict_false(va == 0)) {
+ uvm_pagefree(pg);
+ break;
+ }
+ page = (void *)va;
+#else
+ page = (void *)uvm_km_alloc(kernel_map, PAGE_SIZE);
+#endif
+ page->next = head;
+ head = page;
+ }
+ uvm_km_pages_head = head;
+ uvm_km_pages_free = i;
+
+ kthread_create_deferred(uvm_km_createthread, NULL);
+}
+
+void
+uvm_km_createthread(void *arg)
+{
+ kthread_create(uvm_km_thread, NULL, NULL, "kmthread");
+}
+
+void
+uvm_km_thread(void *arg)
+{
+ struct km_page *head, *tail, *page;
+ int i, s, want;
+
+ for (;;) {
+ if (uvm_km_pages_free >= uvm_km_pages_lowat)
+ tsleep(&uvm_km_pages_head, PVM, "kmalloc", 0);
+ want = uvm_km_pages_lowat - uvm_km_pages_free;
+ if (want < 16)
+ want = 16;
+ for (i = 0; i < want; i++) {
+#if defined(PMAP_MAP_POOLPAGE)
+ struct vm_page *pg;
+ vaddr_t va;
+
+ pg = uvm_pagealloc(NULL, 0, NULL, UVM_PGA_USERESERVE);
+ if (__predict_false(pg == NULL))
+ break;
+ va = PMAP_MAP_POOLPAGE(pg);
+ if (__predict_false(va == 0)) {
+ uvm_pagefree(pg);
+ break;
+ }
+ page = (void *)va;
+#else
+ page = (void *)uvm_km_alloc(kernel_map, PAGE_SIZE);
+#endif
+ if (i == 0)
+ head = tail = page;
+ page->next = head;
+ head = page;
+ }
+ s = splvm();
+ tail->next = uvm_km_pages_head;
+ uvm_km_pages_head = head;
+ uvm_km_pages_free += i;
+ splx(s);
+ }
+}
+
+
+void *
+uvm_km_getpage(void)
+{
+ struct km_page *page;
+ int s;
+
+ s = splvm();
+ page = uvm_km_pages_head;
+ if (page) {
+ uvm_km_pages_head = page->next;
+ uvm_km_pages_free--;
+ }
+ splx(s);
+ if (uvm_km_pages_free < uvm_km_pages_lowat)
+ wakeup(&uvm_km_pages_head);
+ return (page);
+}
+
+void
+uvm_km_putpage(void *v)
+{
+ struct km_page *page = v;
+ int s;
+
+ s = splvm();
+ page->next = uvm_km_pages_head;
+ uvm_km_pages_head = page;
+ uvm_km_pages_free++;
+ splx(s);
+}