Author: alc
Date: Sat Aug 23 05:24:31 2014
New Revision: 270387
URL: http://svnweb.freebsd.org/changeset/base/270387
Log:
Relax one of the conditions for mapping a page on the fast path.
Reviewed by: kib
X-MFC with: r270011
Sponsored by: EMC / Isilon Storage Division
Modified:
head/sys/vm/vm_fault.c
Modified: head/sys/vm/vm_fault.c
==============================================================================
--- head/sys/vm/vm_fault.c Sat Aug 23 02:24:47 2014 (r270386)
+++ head/sys/vm/vm_fault.c Sat Aug 23 05:24:31 2014 (r270387)
@@ -306,8 +306,9 @@ RetryFault:;
(fs.first_object->flags & OBJ_MIGHTBEDIRTY) == 0)
goto fast_failed;
m = vm_page_lookup(fs.first_object, fs.first_pindex);
- if (m == NULL || vm_page_busied(m) ||
- m->valid != VM_PAGE_BITS_ALL)
+ /* A busy page can be mapped for read|execute access. */
+ if (m == NULL || ((prot & VM_PROT_WRITE) != 0 &&
+ vm_page_busied(m)) || m->valid != VM_PAGE_BITS_ALL)
goto fast_failed;
result = pmap_enter(fs.map->pmap, vaddr, m, prot,
fault_type | PMAP_ENTER_NOSLEEP | (wired ? PMAP_ENTER_WIRED :
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