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Enable ubc_direct by default, but only on systems with no more than 2 CPUs 

for now.
This commit is contained in:
ad 2020-04-23 21:53:01 +00:00
parent f5ad84fdb3
commit f6da483c1a
2 changed files with 17 additions and 5 deletions
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6
sys/uvm/uvm_bio.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_bio.c,v 1.110 2020/04/23 21:47:09 ad Exp $ */
/* $NetBSD: uvm_bio.c,v 1.111 2020/04/23 21:53:01 ad Exp $ */
/*
* Copyright (c) 1998 Chuck Silvers.
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.110 2020/04/23 21:47:09 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.111 2020/04/23 21:53:01 ad Exp $");
#include "opt_uvmhist.h"
#include "opt_ubc.h"
@ -64,7 +64,7 @@ static int __noinline ubc_uiomove_direct(struct uvm_object *, struct uio *, vsiz
int, int);
static void __noinline ubc_zerorange_direct(struct uvm_object *, off_t, size_t, int);
bool ubc_direct = false; /* XXX */
bool ubc_direct = true;
#endif
/*

16
sys/uvm/uvm_glue.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_glue.c,v 1.177 2020/03/05 12:21:00 rin Exp $ */
/* $NetBSD: uvm_glue.c,v 1.178 2020/04/23 21:53:01 ad Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -62,7 +62,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_glue.c,v 1.177 2020/03/05 12:21:00 rin Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_glue.c,v 1.178 2020/04/23 21:53:01 ad Exp $");
#include "opt_kgdb.h"
#include "opt_kstack.h"
@ -504,6 +504,18 @@ uvm_scheduler(void)
/* Start the freelist cache. */
uvm_pgflcache_start();
#ifdef PMAP_DIRECT
/*
* XXX Temporary ugly hack. Just before boot, disable ubc_direct if
* there's more than a couple of CPUs, since it has concurrency
* problems.
*/
if (ncpu > 2) {
extern bool ubc_direct;
ubc_direct = false;
}
#endif
for (;;) {
/* Update legacy stats for post-mortem debugging. */
uvm_update_uvmexp();