svn commit: r207408 - user/kmacy/head_page_lock_incr/sys/i386/xen
Kip Macy
kmacy at FreeBSD.org
Fri Apr 30 00:30:29 UTC 2010
Author: kmacy
Date: Fri Apr 30 00:30:29 2010
New Revision: 207408
URL: http://svn.freebsd.org/changeset/base/207408
Log:
convert xen's pmap_extract_and_hold
Modified:
user/kmacy/head_page_lock_incr/sys/i386/xen/pmap.c
Modified: user/kmacy/head_page_lock_incr/sys/i386/xen/pmap.c
==============================================================================
--- user/kmacy/head_page_lock_incr/sys/i386/xen/pmap.c Fri Apr 30 00:06:49 2010 (r207407)
+++ user/kmacy/head_page_lock_incr/sys/i386/xen/pmap.c Fri Apr 30 00:30:29 2010 (r207408)
@@ -1219,14 +1219,19 @@ pmap_extract_and_hold(pmap_t pmap, vm_of
pd_entry_t pde;
pt_entry_t pte;
vm_page_t m;
+ vm_paddr_t pa;
+ pa = 0;
m = NULL;
- vm_page_lock_queues();
PMAP_LOCK(pmap);
+retry:
pde = PT_GET(pmap_pde(pmap, va));
if (pde != 0) {
if (pde & PG_PS) {
if ((pde & PG_RW) || (prot & VM_PROT_WRITE) == 0) {
+ if (vm_page_pa_tryrelock(pmap, (pde & PG_PS_FRAME) |
+ (va & PDRMASK), &pa))
+ goto retry;
m = PHYS_TO_VM_PAGE((pde & PG_PS_FRAME) |
(va & PDRMASK));
vm_page_hold(m);
@@ -1238,13 +1243,15 @@ pmap_extract_and_hold(pmap_t pmap, vm_of
PT_SET_MA(PADDR1, 0);
if ((pte & PG_V) &&
((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) {
+ if (vm_page_pa_tryrelock(pmap, pte & PG_FRAME, &pa))
+ goto retry;
m = PHYS_TO_VM_PAGE(pte & PG_FRAME);
vm_page_hold(m);
}
sched_unpin();
}
}
- vm_page_unlock_queues();
+ PA_UNLOCK_COND(pa);
PMAP_UNLOCK(pmap);
return (m);
}
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