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uvm_kmapent_alloc:

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in the case that there's no cached entries,
if kmem_map is already up, allocate a entry from it
so that we won't try to vm_map_lock recursively.
XXX assuming usage pattern of kmem_map.
This commit is contained in:
yamt 2004-02-07 08:02:21 +00:00
parent 7833fb35ce
commit 4124096ea8
1 changed files with 12 additions and 2 deletions
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14
sys/uvm/uvm_map.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_map.c,v 1.156 2004/02/02 23:13:44 he Exp $ */ /* $NetBSD: uvm_map.c,v 1.157 2004/02/07 08:02:21 yamt Exp $ */
/* /*
* Copyright (c) 1997 Charles D. Cranor and Washington University. * Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -71,7 +71,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_map.c,v 1.156 2004/02/02 23:13:44 he Exp $"); __KERNEL_RCSID(0, "$NetBSD: uvm_map.c,v 1.157 2004/02/07 08:02:21 yamt Exp $");
#include "opt_ddb.h" #include "opt_ddb.h"
#include "opt_uvmhist.h" #include "opt_uvmhist.h"
@ -3977,6 +3977,16 @@ again:
/* /*
* there's no free entry for this vm_map. * there's no free entry for this vm_map.
* now we need to allocate some vm_map_entry. * now we need to allocate some vm_map_entry.
*
* if kmem_map is already up, allocate a entry from it
* so that we won't try to vm_map_lock recursively.
* XXX assuming usage pattern of kmem_map.
*/
if (__predict_true(kmem_map != NULL) && map != kmem_map)
return uvm_kmapent_alloc(kmem_map, flags);
/*
* for simplicity, always allocate one page chunk of them at once. * for simplicity, always allocate one page chunk of them at once.
*/ */