Date: Thu, 5 Mar 2009 18:11:27 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r189415 - head/sys/amd64/amd64 Message-ID: <200903051811.n25IBRj7095551@svn.freebsd.org>
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Author: alc Date: Thu Mar 5 18:11:26 2009 New Revision: 189415 URL: http://svn.freebsd.org/changeset/base/189415 Log: Make pmap_copy() more TLB friendly. Specifically, make it use the kernel's direct map instead of the pmap's recursive mapping to access the lowest level in the page table. MFC after: 6 weeks Modified: head/sys/amd64/amd64/pmap.c Modified: head/sys/amd64/amd64/pmap.c ============================================================================== --- head/sys/amd64/amd64/pmap.c Thu Mar 5 18:03:46 2009 (r189414) +++ head/sys/amd64/amd64/pmap.c Thu Mar 5 18:11:26 2009 (r189415) @@ -3481,9 +3481,6 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pm if (dst_addr != src_addr) return; - if (!pmap_is_current(src_pmap)) - return; - vm_page_lock_queues(); if (dst_pmap < src_pmap) { PMAP_LOCK(dst_pmap); @@ -3545,14 +3542,16 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pm continue; } - srcmpte = PHYS_TO_VM_PAGE(srcptepaddr & PG_FRAME); + srcptepaddr &= PG_FRAME; + srcmpte = PHYS_TO_VM_PAGE(srcptepaddr); KASSERT(srcmpte->wire_count > 0, ("pmap_copy: source page table page is unused")); if (va_next > end_addr) va_next = end_addr; - src_pte = vtopte(addr); + src_pte = (pt_entry_t *)PHYS_TO_DMAP(srcptepaddr); + src_pte = &src_pte[pmap_pte_index(addr)]; while (addr < va_next) { pt_entry_t ptetemp; ptetemp = *src_pte;
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