Consider BUFPAGES_DEFICIT in swap_shortage.

ok beck@

diff --git a/sys/uvm/uvm_pdaemon.c b/sys/uvm/uvm_pdaemon.c
index f2ab570..5d66cbd 100644 (file)
--- a/sys/uvm/uvm_pdaemon.c
+++ b/sys/uvm/uvm_pdaemon.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: uvm_pdaemon.c,v 1.98 2022/05/04 14:58:26 mpi Exp $    */
+/*     $OpenBSD: uvm_pdaemon.c,v 1.99 2022/05/12 12:49:31 mpi Exp $    */
 /*     $NetBSD: uvm_pdaemon.c,v 1.23 2000/08/20 10:24:14 bjh21 Exp $   */
 
 /*
@@ -923,12 +923,13 @@ uvmpd_scan(void)
         * detect if we're not going to be able to page anything out
         * until we free some swap resources from active pages.
         */
+       free = uvmexp.free - BUFPAGES_DEFICIT;
        swap_shortage = 0;
-       if (uvmexp.free < uvmexp.freetarg &&
+       if (free < uvmexp.freetarg &&
            uvmexp.swpginuse == uvmexp.swpages &&
            !uvm_swapisfull() &&
            pages_freed == 0) {
-               swap_shortage = uvmexp.freetarg - uvmexp.free;
+               swap_shortage = uvmexp.freetarg - free;
        }
 
        for (p = TAILQ_FIRST(&uvm.page_active);