Date: Sun, 19 Feb 2017 06:14:34 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r313939 - head/sys/i386/i386 Message-ID: <201702190614.v1J6EYnD031985@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: kib Date: Sun Feb 19 06:14:33 2017 New Revision: 313939 URL: https://svnweb.freebsd.org/changeset/base/313939 Log: MFamd64 r313933: microoptimize pmap_protect_pde(). Noted by: alc Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/i386/i386/pmap.c Modified: head/sys/i386/i386/pmap.c ============================================================================== --- head/sys/i386/i386/pmap.c Sun Feb 19 06:02:41 2017 (r313938) +++ head/sys/i386/i386/pmap.c Sun Feb 19 06:14:33 2017 (r313939) @@ -3129,12 +3129,12 @@ pmap_protect_pde(pmap_t pmap, pd_entry_t anychanged = FALSE; retry: oldpde = newpde = *pde; - if (oldpde & PG_MANAGED) { + if ((oldpde & (PG_MANAGED | PG_M | PG_RW)) == + (PG_MANAGED | PG_M | PG_RW)) { eva = sva + NBPDR; for (va = sva, m = PHYS_TO_VM_PAGE(oldpde & PG_PS_FRAME); va < eva; va += PAGE_SIZE, m++) - if ((oldpde & (PG_M | PG_RW)) == (PG_M | PG_RW)) - vm_page_dirty(m); + vm_page_dirty(m); } if ((prot & VM_PROT_WRITE) == 0) newpde &= ~(PG_RW | PG_M);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201702190614.v1J6EYnD031985>