Date: Fri, 12 Dec 2014 09:22:53 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r275726 - stable/10/sys/vm Message-ID: <201412120922.sBC9MrB7035461@svn.freebsd.org>
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Author: kib Date: Fri Dec 12 09:22:52 2014 New Revision: 275726 URL: https://svnweb.freebsd.org/changeset/base/275726 Log: MFC r275513: When the last reference on the vnode' vm object is dropped, read the vp->v_vflag without taking vnode lock and without bypass. Modified: stable/10/sys/vm/vm_object.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/vm/vm_object.c ============================================================================== --- stable/10/sys/vm/vm_object.c Fri Dec 12 08:00:56 2014 (r275725) +++ stable/10/sys/vm/vm_object.c Fri Dec 12 09:22:52 2014 (r275726) @@ -468,7 +468,12 @@ vm_object_vndeallocate(vm_object_t objec } #endif - if (object->ref_count > 1) { + /* + * The test for text of vp vnode does not need a bypass to + * reach right VV_TEXT there, since it is obtained from + * object->handle. + */ + if (object->ref_count > 1 || (vp->v_vflag & VV_TEXT) == 0) { object->ref_count--; VM_OBJECT_WUNLOCK(object); /* vrele may need the vnode lock. */
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