diff options
Diffstat (limited to 'sys/uvm/uvm_km.c')
| -rw-r--r-- | sys/uvm/uvm_km.c | 28 |
1 files changed, 11 insertions, 17 deletions
diff --git a/sys/uvm/uvm_km.c b/sys/uvm/uvm_km.c index 693392c8972..c0b99379e1f 100644 --- a/sys/uvm/uvm_km.c +++ b/sys/uvm/uvm_km.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_km.c,v 1.67 2008/06/14 03:48:32 art Exp $ */ +/* $OpenBSD: uvm_km.c,v 1.68 2008/10/23 23:54:02 tedu Exp $ */ /* $NetBSD: uvm_km.c,v 1.42 2001/01/14 02:10:01 thorpej Exp $ */ /* @@ -760,9 +760,10 @@ uvm_km_page_init(void) } void * -uvm_km_getpage(boolean_t waitok) +uvm_km_getpage(boolean_t waitok, int *slowdown) { + *slowdown = 0; return ((void *)uvm_km_alloc_poolpage1(NULL, NULL, waitok)); } @@ -791,6 +792,8 @@ struct km_page { struct km_page *next; } *uvm_km_pages_head; +struct proc *uvm_km_proc; + void uvm_km_createthread(void *); void uvm_km_thread(void *); @@ -833,7 +836,7 @@ uvm_km_page_init(void) void uvm_km_createthread(void *arg) { - kthread_create(uvm_km_thread, NULL, NULL, "kmthread"); + kthread_create(uvm_km_thread, NULL, &uvm_km_proc, "kmthread"); } /* @@ -878,10 +881,11 @@ uvm_km_thread(void *arg) * permits it. Wake up the thread if we've dropped below lowat. */ void * -uvm_km_getpage(boolean_t waitok) +uvm_km_getpage(boolean_t waitok, int *slowdown) { struct km_page *page = NULL; + *slowdown = 0; mtx_enter(&uvm_km_mtx); for (;;) { page = uvm_km_pages_head; @@ -894,22 +898,12 @@ uvm_km_getpage(boolean_t waitok) break; msleep(&uvm_km_pages_free, &uvm_km_mtx, PVM, "getpage", 0); } + mtx_leave(&uvm_km_mtx); if (uvm_km_pages_free < uvm_km_pages_lowat) { + if (curproc != uvm_km_proc) + *slowdown = 1; wakeup(&uvm_km_pages_head); - - /* - * If we're below the low watermark and are allowed to - * sleep, we should slow down our allocations a bit - * to not exhaust the reserve of pages for nosleep - * allocators. - * - * Just sleep once. - */ - if (waitok) - msleep(&uvm_km_pages_free, &uvm_km_mtx, PPAUSE, - "getpg2", 0); } - mtx_leave(&uvm_km_mtx); return (page); } |