Date: Sat, 18 May 2013 22:16:42 +0000 (UTC) From: Attilio Rao <attilio@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r250789 - user/attilio/vmobj-readlock/sys/vm Message-ID: <201305182216.r4IMGgqF054373@svn.freebsd.org>
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Author: attilio Date: Sat May 18 22:16:42 2013 New Revision: 250789 URL: http://svnweb.freebsd.org/changeset/base/250789 Log: Switch vm_fault_copy_entry() locking for read-in pages. Sponsored by: EMC / Isilon storage division Modified: user/attilio/vmobj-readlock/sys/vm/vm_fault.c Modified: user/attilio/vmobj-readlock/sys/vm/vm_fault.c ============================================================================== --- user/attilio/vmobj-readlock/sys/vm/vm_fault.c Sat May 18 19:30:42 2013 (r250788) +++ user/attilio/vmobj-readlock/sys/vm/vm_fault.c Sat May 18 22:16:42 2013 (r250789) @@ -1320,7 +1320,7 @@ vm_fault_copy_entry(vm_map_t dst_map, vm * (Because the source is wired down, the page will be in * memory.) */ - VM_OBJECT_WLOCK(src_object); + VM_OBJECT_RLOCK(src_object); object = src_object; pindex = src_pindex + dst_pindex; while ((src_m = vm_page_lookup(object, pindex)) == NULL && @@ -1329,15 +1329,15 @@ vm_fault_copy_entry(vm_map_t dst_map, vm /* * Allow fallback to backing objects if we are reading. */ - VM_OBJECT_WLOCK(backing_object); + VM_OBJECT_RLOCK(backing_object); pindex += OFF_TO_IDX(object->backing_object_offset); - VM_OBJECT_WUNLOCK(object); + VM_OBJECT_RUNLOCK(object); object = backing_object; } if (src_m == NULL) panic("vm_fault_copy_wired: page missing"); pmap_copy_page(src_m, dst_m); - VM_OBJECT_WUNLOCK(object); + VM_OBJECT_RUNLOCK(object); dst_m->valid = VM_PAGE_BITS_ALL; dst_m->dirty = VM_PAGE_BITS_ALL; VM_OBJECT_WUNLOCK(dst_object);help
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