Compas.cs.stonybrook.edu Courses

CSE 506 Nima Honarmand Stony Brook University

Operating Compas.cs.stonybrook.edu

8 hours ago Operating Systems: Three Easy Pieces, Free Space Management. Scalable memory allocation using jemalloc. Understanding glibc malloc. Dynamic Storage Allocation: A Survey and Critical Review. 03/01: 03/06: CPU Scheduling, Context Switching and Multithreading: Lab 4 released. 03/08: Midterm Exam (In Class) 03/13: No Class (Spring Recess) 03/15: 03/20

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/schedule.html

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CSE 506 Nima Honarmand

Memory Compas.cs.stonybrook.edu

4 hours ago In this lab, you will write the memory management code for your operating system. Memory management has two components. The first component is a physical memory allocator for the kernel, so that the kernel can allocate memory and later free it. Your allocator will operate in units of 4096 bytes, called pages . Your task will be to maintain data

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/lab2.html

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File System Implementation Stony Brook University

List/bitmap Compas.cs.stonybrook.edu

6 hours agoFree data block list/bitmap • Free inode list/bitmap •inodes: per-file metadata • Attributes (e.g., file or directory, size) • Pointers to data blocks •Keep in mind: almost every FS operation involves accessing (reading and/or writing) both metadata and data blocks.

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/slides/11-fs_impl.pdf

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A Brief Introduction To SystemVerilog

Modeling Compas.cs.stonybrook.edu

2 hours ago course project web page –Including a link to a good Verilog tutorial . Spring 2015 :: CSE 502 –Computer Architecture Hardware Description Languages •Used for a variety of purposes in hardware design –High-level behavioral modeling –Register Transfer Level (RTL) behavioral modeling

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp15/cse502/slides/03-systemverilog.pdf

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Memory Allocation

•Per Compas.cs.stonybrook.edu

4 hours ago •The bookkeeping for alloc and free is pretty straightforward; many allocators are quite complex (slab) •Per heap: 1 list of superblocks per object size •Per superblock: –Need to know which/how many objects are free •LIFO list of free blocks

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa14/cse506.2/slides/malloc.pdf

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Dynamic Memory Allocation

Object Compas.cs.stonybrook.edu

5 hours ago •For free objects, can keep the meta-data in the object itself. Spring 2017 :: CSE 506 Tracking Free Regions •Link the free objects in a linked list •Using the nextfield in the free object header •Keep in the list head in a global variable •malloc()is simple using this representation

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/slides/07-malloc.pdf

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CSE 306 Nima Honarmand Stony Brook University

Memory Compas.cs.stonybrook.edu

4 hours ago To become familiar with Unix-style forking and x86 memory management, you will convert the simple fork() implementation in xv6 to a copy-on-write fork(). This will involve writing a trap handler for page faults, augmenting the physical memory management code, and, of course, manipulating page tables.

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa17/cse306/lab2.html

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Virtual Memory In X86

32-bit Compas.cs.stonybrook.edu

5 hours ago Fall 2017 :: CSE 306 xv6 uses protected mode w/o PAE (i.e., 32-bit virtual and physical addresses) x86 Processor Modes •Long mode –64-bit mode (aka amd64, x86_64, etc.) •Very similar to 32-bit mode (protected mode), but bigger address space

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa17/cse306/slides/07-x86_vm.pdf

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Precise State Recovery Stony Brook University

CDBV Compas.cs.stonybrook.edu

2 hours ago free. Spring 2018 :: CSE 502 P6: Cycle 7 Reservation Stations # FU busy op T T1 T2 V1 V2 1 ALU no 2 LD yes ldf ROB#5 ROB#4 CDB.V 3 ST yes stf ROB#3 ROB#2 [r1] 4 FP1 yes mulf ROB#6 ROB#5[f0] 5 FP2 no ROB#4 ready grab CDB.V ROB ht # Insn R V S X C 1 f1 = ldf (r1) f1 [f1] c2 c3 c4

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp18/cse502/slides/09-rob.pdf

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Register Renaming OutofOrder Execution

Location Compas.cs.stonybrook.edu

4 hours ago –On a write: allocate new location (from a free list), note in map-table –On a read: find location of most recent write via map-table. Spring 2016 :: CSE 502 –Computer Architecture Register Renaming •Anti (WAR) and output (WAW) deps. are false –Dep. is on name/location, not on data

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp16/cse502/slides/08-superscalar_ooo.pdf

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CSE 306 Nima Honarmand Stony Brook University

System Compas.cs.stonybrook.edu

4 hours ago The absolute first step for this lab is to understand the Fast File System (FFS) design. If you have not already, please read Chapter 41 of the course textbook. You will be implementing several features of this design in xv6. xv6 File System Background. A second essential task before starting is …

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa17/cse306/lab5.html

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Ext(2/3/4) File Systems Computer Architecture Stony

Block Compas.cs.stonybrook.edu

2 hours ago •Deletion requires marking 250 slots as free •Worse for highly fragmented or sparse files –If no contiguous blocks, need one extent for each block –Basically a more expensive indirect block scheme. Fall 2014:: CSE 506:: Section 2 (PhD) Static inode Allocations

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa14/cse506.2/slides/ext4.pdf

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CSE 306 Nima Honarmand Compas.cs.stonybrook.edu

Examines Compas.cs.stonybrook.edu

4 hours ago Lab 1 Introduction. This lab is split into three parts. The first part concentrates on getting familiarized with x86 assembly language, the QEMU x86 emulator, and the PC's power-on bootstrap procedure. The second part examines the boot loader for our kernel, which resides in the boot directory of the lab tree. Finally, in Part 3, you will add a

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa17/cse306/lab1.html

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Register Renaming OutofOrder Execution

Location Compas.cs.stonybrook.edu

4 hours ago –On a write: allocate new location (from a free list), note in map-table –On a read: find location of most recent write via map-table. Spring 2015 :: CSE 502 –Computer Architecture Register Renaming •Anti (WAR) and output (WAW) deps. are false –Dep. is on name/location, not on data

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp15/cse502/slides/08-superscalar_ooo.pdf

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Precise State Recovery Stony Brook University

F0f1 Compas.cs.stonybrook.edu

2 hours ago free ldfretires 1. write ROB result to regfile. Spring 2015 :: CSE 502 –Computer Architecture P6: Cycle 6 ROB ht # Insn R V S X C 1 f1 = ldf (r1) f1 [f1] c2 c3 c4 h 2 f2 = mulf f0,f1 f2 c4 c5+ 3 stf f2,(r1) 4 r1 = addi r1,4 r1 c5 c6 5 f1 = ldf (r1) f1 t 6 f2 = mulf f0,f1 f2 7 stf f2,(r1) Map Table Reg T+ f0 f1 ROB#5

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp15/cse502/slides/09-rob.pdf

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Page Frame Management

Pages Compas.cs.stonybrook.edu

1 hours agoFree harmless pages first –Consider dropping clean disk cache (can read it again) –Steal pages from user programs •Especially those that haven’t been used recently •Must save them to disk in case they are needed again –Consider dropping dirty disk cache

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa14/cse506.2/slides/pfm.pdf

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Virtual Memory Process Address Space

Memory Compas.cs.stonybrook.edu

7 hours ago •Recall: OS is free to allocate any free page in the virtual address space if user doesn’t specify an address •What if the OS allocates the page above the “top” of the stack? •You can’t grow the stack any further •Out of memory fault with plenty of memory spare …

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/slides/03-using_vm.pdf

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Tool Interface Standard (TIS) Executable And Linking

Committee Compas.cs.stonybrook.edu

6 hours ago The TIS Committee grants you a non-exclusive, worldwide, royalty-free license to use the information disclosed in this Specification to make your software TIS-compliant; no other license, express or implied, is granted or intended hereby. The TIS Committee makes no warranty for the use of this standard.

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/ref/elf.pdf

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Interrupts And System Calls Stony Brook University

Interrupts Compas.cs.stonybrook.edu

8 hours ago –What if both try to grab a lock for the free list? CSE 506: Operating Systems Disabling interrupts •An x86 CPU can disable I/O interrupts –Clear bit 9 of the EFLAGS register (IF Flag) –cliand stiinstructions clear and set this flag •Before touching a shared data structure (or grabbing

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/fa14/cse506.2/slides/interrupts.pdf

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CSE 506 Nima Honarmand Stony Brook University

Bootstrap Compas.cs.stonybrook.edu

4 hours ago Exercise 2. Read boot_aps() and mp_main() in kern/init.c, and the assembly code in kern/mpentry.S.Make sure you understand the control flow transfer during the bootstrap of APs. Then modify your implementation of page_init() in kern/pmap.c to avoid adding the page at MPENTRY_PADDR to the free list, so that we can safely copy and run AP bootstrap code at that physical address.

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/lab4.html

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The SPARC Architecture Manual Version 8

Appropriate Compas.cs.stonybrook.edu

7 hours ago tem implementations. Rather, designers are free to use the MMU that is most appropriate for their application — or no MMU at all, if they wish. A SPARC “Reference MMU” has been specified, which is appropriate for a wide range of applications. See Appendix H, “SPARC Reference MMU Architecture,” for more information.

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp15/cse502/res/sparcv8-manual.pdf

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Page Frame Management

•Free Compas.cs.stonybrook.edu

2 hours agoFree page frames grouped into lists •Project for extra grade (up to 5 points of course grade) Investigate and write a detailed report of the data structures and algorithms used for reverse mapping in Linux 4.19 (latest version as of the time of this writing) Spring 2017 :: CSE 506

Website: https://compas.cs.stonybrook.edu/~nhonarmand/courses/sp17/cse506/slides/06-pfm.pdf

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