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CMU CS 15213 - Lecture

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Page 1P6 / Linux Memory SystemMarch 23, 2004P6 / Linux Memory SystemMarch 23, 2004Topics P6 address translation Linux memory management Linux page fault handling Memory mappingclass19.ppt15-213“The course that gives CMU its Zip!”– 2 –15-213, S’04Intel P6(Bob Collwel’s Chip, CMU Alumni)Intel P6(Bob Collwel’s Chip, CMU Alumni)Internal Designation for Successor to Pentium Which had internal designation P5Fundamentally Different from Pentium Out-of-order, superscalar operation Designed to handle server applications Requires high performance memory systemResulting Processors PentiumPro (1996) Pentium II (1997) Incorporated MMX instructions» special instructions for parallel processing L2 cache on same chip Pentium III (1999) Incorporated Streaming SIMD Extensions» More instructions for parallel processing– 3 –15-213, S’04P6 Memory SystemP6 Memory Systembus interface unitDRAMexternal system bus (e.g. PCI)instructionfetch unitL1i-cacheL2cachecache busL1d-cacheinstTLBdataTLBprocessor package32 bit address space4 KB page sizeL1, L2, and TLBs 4-way set associativeInst TLB 32 entries 8 setsData TLB 64 entries 16 setsL1 i-cache and d-cache 16 KB 32 B line size 128 setsL2 cache unified 128 KB -- 2 MB– 4 –15-213, S’04Review of AbbreviationsReview of AbbreviationsSymbols: Components of the virtual address (VA) TLBI: TLB index TLBT: TLB tag VPO: virtual page offset  VPN: virtual page number  Components of the physical address (PA) PPO: physical page offset (same as VPO) PPN: physical page number CO: byte offset within cache line CI: cache index CT: cache tagPage 2– 5 –15-213, S’04IA32 Segmented VM OverviewIA32 Segmented VM Overview– 6 –15-213, S’04Overview of P6 Address TranslationOverview of P6 Address TranslationCPUVPN VPO20 12TLBT TLBI416virtual address (VA)...TLB (16 sets, 4 entries/set)VPN1 VPN21010PDE PTEPDBRPPN PPO20 12Page tablesTLBmissTLBhitphysicaladdress (PA)result32...CT CO20 5CI7L2 and DRAML1 (128 sets, 4 lines/set)L1hitL1miss– 7 –15-213, S’04P6 2-level Page Table StructureP6 2-level Page Table StructurePage directory  1024 4-byte page directory entries (PDEs) that point to page tables one page directory per process. page directory must be in memory when its process is running always pointed to by PDBRPage tables: 1024 4-byte page table entries (PTEs) that point to pages. page tables can be paged in and out.page directory...Up to 1024 page tables1024PTEs1024PTEs1024PTEs...1024PDEs– 8 –15-213, S’04P6 Page Directory Entry (PDE)P6 Page Directory Entry (PDE)Page table physical base addr Avail G PS A CD WT U/S R/W P=1Page table physical base address: 20 most significant bits of physical page table address (forces page tables to be 4KB aligned)Avail: These bits available for system programmersG: global page (don’t evict from TLB on task switch)PS: page size 4K (0) or 4M (1)A: accessed (set by MMU on reads and writes, cleared by software)CD: cache disabled (1) or enabled (0)WT: write-through or write-back cache policy for this page tableU/S: user or supervisor mode accessR/W: read-only or read-write accessP: page table is present in memory (1) or not (0)31 1211 9 8 7 6 5 4 3 2 1 0Available for OS (page table location in secondary storage) P=031 01Page 3– 9 –15-213, S’04P6 Page Table Entry (PTE)P6 Page Table Entry (PTE)Page physical base address Avail G 0 D A CD WT U/S R/W P=1Page base address: 20 most significant bits of physical page address (forces pages to be 4 KB aligned)Avail: available for system programmersG: global page (don’t evict from TLB on task switch)D: dirty (set by MMU on writes)A: accessed (set by MMU on reads and writes) CD: cache disabled or enabledWT: write-through or write-back cache policy for this pageU/S: user/supervisorR/W: read/writeP: page is present in physical memory (1) or not (0)31 1211 9 8 7 6 5 4 3 2 1 0Available for OS (page location in secondary storage) P=031 01– 10 –15-213, S’04How P6 Page Tables Map VirtualAddresses to Physical OnesHow P6 Page Tables Map VirtualAddresses to Physical OnesPDEPDBRphysical addressof page table base(if P=1)physical addressof page base(if P=1)physical addressof page directoryword offset into page directoryword offset into page tablepage directory page tableVPN110VPO10 12VPN2 Virtual addressPTEPPN PPO2012Physical addressword offset into physical and virtualpage– 11 –15-213, S’044Mbyte PDE’s4Mbyte PDE’s– 12 –15-213, S’04Support for 4Mbyte PagesSupport for 4Mbyte PagesPage 4– 13 –15-213, S’04Representation of VM Address SpaceRepresentation of VM Address SpaceSimplified Example 16 page virtual address spaceFlags P: Is entry in physical memory? M: Has this part of VA space been mapped?Page DirectoryPT 3P=1, M=1P=1, M=1P=0, M=0P=0, M=1••••P=1, M=1P=0, M=0P=1, M=1P=0, M=1••••P=1, M=1P=0, M=0P=1, M=1P=0, M=1••••P=0, M=1P=0, M=1P=0, M=0P=0, M=0••••PT 2PT 0Page 0Page 1Page 2Page 3Page 4Page 5Page 6Page 7Page 8Page 9Page 10Page 11Page 12Page 13Page 14Page 15Mem AddrDisk AddrIn MemOn DiskUnmapped– 14 –15-213, S’04Aside: Inverted Page TablesAside: Inverted Page TablesProblem: PageProblem: Page--table storage overhead is a function of table storage overhead is a function of the virtual address space size.the virtual address space size.VPNPPNTAG=?HitHash– 15 –15-213, S’04P6 TLB TranslationP6 TLB TranslationCPUVPN VPO20 12TLBT TLBI416virtual address (VA)...TLB (16 sets, 4 entries/set)VPN1 VPN21010PDE PTEPDBRPPN PPO20 12Page tablesTLBmissTLBhitphysicaladdress (PA)result32...CT CO20 5CI7L2 and DRAML1 (128 sets, 4 lines/set)L1hitL1miss– 16 –15-213, S’04P6 TLBP6 TLBTLB entry (not all documented, so this is speculative): V: indicates a valid (1) or invalid (0) TLB entry PD: is this entry a PDE (1) or a PTE (0)? tag: disambiguates entries cached in the same set PDE/PTE: page directory or page table entry Structure of the data TLB: 16 sets, 4 entries/setPDE/PTE Tag PD V1 11632entry entry entry entryentry entry entry entryentry entry entry entryentry entry entry entry...set 0set 1set 2set 15Page 5– 17 –15-213, S’04Translating with the P6 TLBTranslating with the P6 TLB1. Partition VPN into TLBT and TLBI.2. Is the PTE for VPN cached in set TLBI? 3. Yes: then build physical address. 4. No: then read PTE (and PDE if not cached) from memory and build


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