From owner-svn-src-head@FreeBSD.ORG Sun Dec 19 07:31:57 2010 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 002AF106566B; Sun, 19 Dec 2010 07:31:56 +0000 (UTC) (envelope-from alc@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id E2C4A8FC12; Sun, 19 Dec 2010 07:31:56 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id oBJ7VuWs064198; Sun, 19 Dec 2010 07:31:56 GMT (envelope-from alc@svn.freebsd.org) Received: (from alc@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id oBJ7VuiB064196; Sun, 19 Dec 2010 07:31:56 GMT (envelope-from alc@svn.freebsd.org) Message-Id: <201012190731.oBJ7VuiB064196@svn.freebsd.org> From: Alan Cox Date: Sun, 19 Dec 2010 07:31:56 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r216555 - head/sys/i386/i386 X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Dec 2010 07:31:57 -0000 Author: alc Date: Sun Dec 19 07:31:56 2010 New Revision: 216555 URL: http://svn.freebsd.org/changeset/base/216555 Log: Redo some parts of r216333, specifically, the locking changes to pmap_extract_and_hold(), and undo the rest. In particular, I forgot that PG_PS and PG_PTE_PAT are the same bit. Modified: head/sys/i386/i386/pmap.c Modified: head/sys/i386/i386/pmap.c ============================================================================== --- head/sys/i386/i386/pmap.c Sun Dec 19 06:09:02 2010 (r216554) +++ head/sys/i386/i386/pmap.c Sun Dec 19 07:31:56 2010 (r216555) @@ -1291,21 +1291,23 @@ pmap_pte_quick(pmap_t pmap, vm_offset_t vm_paddr_t pmap_extract(pmap_t pmap, vm_offset_t va) { - pt_entry_t pte, *ptep; vm_paddr_t rtval; + pt_entry_t *pte; + pd_entry_t pde; rtval = 0; PMAP_LOCK(pmap); - ptep = pmap_pte(pmap, va); - pte = (ptep != NULL) ? *ptep : 0; - pmap_pte_release(ptep); - PMAP_UNLOCK(pmap); - if ((pte & PG_V) != 0) { - if ((pte & PG_PS) != 0) - rtval = (pte & PG_PS_FRAME) | (va & PDRMASK); - else - rtval = (pte & PG_FRAME) | (va & PAGE_MASK); + pde = pmap->pm_pdir[va >> PDRSHIFT]; + if (pde != 0) { + if ((pde & PG_PS) != 0) + rtval = (pde & PG_PS_FRAME) | (va & PDRMASK); + else { + pte = pmap_pte(pmap, va); + rtval = (*pte & PG_FRAME) | (va & PAGE_MASK); + pmap_pte_release(pte); + } } + PMAP_UNLOCK(pmap); return (rtval); } @@ -1319,30 +1321,40 @@ pmap_extract(pmap_t pmap, vm_offset_t va vm_page_t pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) { + pd_entry_t pde; pt_entry_t pte, *ptep; - vm_paddr_t locked_pa, pa; vm_page_t m; + vm_paddr_t pa; - locked_pa = 0; + pa = 0; m = NULL; PMAP_LOCK(pmap); retry: - ptep = pmap_pte(pmap, va); - pte = (ptep != NULL) ? *ptep : 0; - pmap_pte_release(ptep); - if ((pte & PG_V) != 0 && - ((pte & PG_RW) != 0 || (prot & VM_PROT_WRITE) == 0)) { - if ((pte & PG_PS) != 0) { - /* Compute the physical address of the 4KB page. */ - pa = (pte & PG_PS_FRAME) | (va & PG_FRAME & PDRMASK); - } else - pa = pte & PG_FRAME; - if (vm_page_pa_tryrelock(pmap, pa, &locked_pa)) - goto retry; - m = PHYS_TO_VM_PAGE(pa); - vm_page_hold(m); - PA_UNLOCK(locked_pa); + pde = *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); + } + } else { + ptep = pmap_pte(pmap, va); + pte = *ptep; + pmap_pte_release(ptep); + if (pte != 0 && + ((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); + } + } } + PA_UNLOCK_COND(pa); PMAP_UNLOCK(pmap); return (m); } @@ -4979,30 +4991,39 @@ pmap_change_attr(vm_offset_t va, vm_size int pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa) { + pd_entry_t *pdep; pt_entry_t *ptep, pte; vm_paddr_t pa; int val; PMAP_LOCK(pmap); retry: - ptep = pmap_pte(pmap, addr); - pte = (ptep != NULL) ? *ptep : 0; - pmap_pte_release(ptep); - if ((pte & PG_V) != 0) { - val = MINCORE_INCORE; - if ((pte & PG_PS) != 0) { - val |= MINCORE_SUPER; + pdep = pmap_pde(pmap, addr); + if (*pdep != 0) { + if (*pdep & PG_PS) { + pte = *pdep; /* Compute the physical address of the 4KB page. */ - pa = (pte & PG_PS_FRAME) | (addr & PG_FRAME & PDRMASK); - } else + pa = ((*pdep & PG_PS_FRAME) | (addr & PDRMASK)) & + PG_FRAME; + val = MINCORE_SUPER; + } else { + ptep = pmap_pte(pmap, addr); + pte = *ptep; + pmap_pte_release(ptep); pa = pte & PG_FRAME; + val = 0; + } + } else { + pte = 0; + pa = 0; + val = 0; + } + if ((pte & PG_V) != 0) { + val |= MINCORE_INCORE; if ((pte & (PG_M | PG_RW)) == (PG_M | PG_RW)) val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER; if ((pte & PG_A) != 0) val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER; - } else { - val = 0; - pa = 0; } if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) != (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) &&