DOCSLIB.ORG

Llvmlinux: Embracing the Dragon

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Llvmlinux: Embracing the Dragon LLVMLinux: Embracing the Dragon Presented by: Behan Webster (LLVMLinux project lead) LLVMLinux project Presentation Date: 2014.08.22 Clang/LLVM ● LLVM is a Toolchain Toolkit (libraries from which compilers and related technologies can be built) ● Clang is a C/C++ toolchain LLVMLinux project New Clang Benchmarks (compilation) Timed ImageMagick Compilation v6.8.1-10 Time To Compile Seconds, Less Is Better OpenBenchmarking.org GCC 4.8.2 60.35 SE +/- 0.36 GCC 4.9.0 RC1 60.59 SE +/- 0.04 LLVM Clang 3.5 20140413 29.61 SE +/- 0.14 14 28 42 56 70 Powered By Phoronix Test Suite 5.0.1 http://www.phoronix.com/scan.php?page=article&item=gcc49_compiler_llvm35&num=1 LLVMLinux project New Clang Benchmarks (execution) ebizzy v0.3 Records/s Seconds, More Is Better OpenBenchmarking.org GCC 4.8.2 42849 SE +/- 109.85 GCC 4.9.0 RC1 42950 SE +/- 44.08 LLVM Clang 3.5 20140413 43202 SE +/- 53.03 9000 18000 27000 36000 45000 Powered By Phoronix Test Suite 5.0.1 1. (CC) gcc options: -pthread -lpthread -O3 -march=native http://www.phoronix.com/scan.php?page=article&item=gcc49_compiler_llvm35&num=1 LLVMLinux project Other Interesting LLVM Related Projects ● Clang Static Analyzer ● Energy consumption analysis of programs using LLVM ● CUDA ● llvmpipe (Galium3D) ● OpenCL (most implementations are based on LLVM) ● Clang is one of the Android NDK compilers ● Renderscript in Android is based on LLVM ● Code transformation tools LLVMLinux project The LLVMLinux Project Goals ● Fully build the Linux kernel for multiple architectures, using the Clang/LLVM toolchain ● Discover LLVM/Kernel issues early and find fixes quickly across both communities ● Upstream patches to the Linux Kernel and LLVM projects ● Bring together like-minded developers ● Enable the kernel community to do more in depth analysis of the kernel code LLVMLinux project LLVMLinux Build/Test System ● Fetches, patches, builds, tests: clang, kernel, qemu, etc – git clone http://git.linuxfoundation.org/llvmlinux.git – cd llvmlinux/target/vexpress (or x86_64) – make LLVMLinux project Patched Mainline Kernel Tree ● A mainline kernel tree with all LLVMLinux patches applied on top is now available: – git://git.linuxfoundation.org/llvmlinux/kernel.git ● Dated llvmlinux branches – remotes/origin/llvmlinux-2014.07.30 ● The master branch is rebased regularly LLVMLinux project Supported Architectures ● X86 (i586 and x86_64) ● ARM ● AARCH64 ● And now MIPS (Work in progress) LLVMLinux project Linux-Next ● LLVMLinux project now has a branch which is pulled into Linux-Next – git://git.linuxfoundation.org/llvmlinux/kernel.git – remotes/origin/for-next ● Broader testing of our patches by more people ● Last step before being submitted to mainline LLVMLinux project Improved Buildbot Farm ● New better buildbot master ● 4 slave build servers (2 more on the way) ● More CI builds for targets are in the works ● Configs for known good compiler versions and kernels LLVMLinux project Other Avenues of Interest ● Clang Static Analysis of the Linux kernel ● Kernel specific Checkers (GSoC) ● Compiling the Android kernel and AOSP with clang ● Supporting Linaro LLVM team ● Adding clang support to yocto ● Building better tools based on LLVM for the kernel community LLVMLinux project LLVMLinux Project Status ● LLVM/clang: – All LLVMLinux patches for LLVM are Upstream – Newer LLVM patches to support the Linux kernel are mostly being added by upstream maintainers ● Linux Kernel: – Roughly 47 kernel patches for various arches – LLVMLinux branch in linux-next LLVMLinux project Kernel Patches ● Patches still working their way upstream Architecture Number of patches Submitted all 13 1 arm 10 8 aarch64 16 4 x86_64 8 0 TOTALS 47 13 LLVMLinux project Kbuild ● Basic Kbuild support for clang and x86 has been upstreamed ● Specific support for ARM and aarch64 ready to be upstreamed LLVMLinux project Integrated Assembly Status ● David Woodhouse added .code16 support for X86 ASM ● Renato Golin, Vicinius Tinti, Saleem Abdulrasool and Stepan Dyatkovskiy are working on fixing IA issues in clang to support the Linux ARM kernel code (and ultimately AARCH64) ● For now we disable the IA and use GNU as instead LLVMLinux project Different option passing ● gcc passes -march to GNU as ● clang doesn't... (Bug submitted PR) -CFLAGS_aes-ce-cipher.o += -march=armv8-a+crypto +CFLAGS_aes-ce-cipher.o += -march=armv8-a+crypto -Wa,-march=armv8-a+crypto LLVMLinux project extern inline: Different for gnu89 and gnu99 ● GNU89/GNU90 (used by gcc) – Function will be inlined where it is used – No function definition is emitted – A non-inlined function may also be provided ● GNU99/C99 (used by clang) – Function will be inlined where it is used – An external function is emitted – No other function of the same name may be provided. ● Solution? Use “static inline” instead. ● Only still an issue for ARM support for ftrace (submitted) LLVMLinux project Attribute Order ● gcc is less picky about placement of __attribute__(()) ● clang requires it at the end of the type or variable -struct __read_mostly va_alignment va_align = { +struct va_alignment __read_mostly va_align = { LLVMLinux project Named Registers ● Named registers for X86 kernel have been fixed in mainline kernel by Andi Kleen ● clang now supports using a globally named register for the stack pointer ● For ARM/AARCH64 move to using a global in asm/thread_info.h register unsigned long current_stack_pointer asm ("sp"); LLVMLinux project ARM percpu patch ● One of the uses of Named Registers in the ARM code is due to a deficiency in gcc. ● The new code which works with gcc fails in clang. ● Solution, provide routines for both, and choose at compile time ● Gcc: asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : "Q" (*sp)); ● Clang: asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : : "memory"); LLVMLinux project Section Mismatch Issues (MergedGlobals) ● By default clang merges globals with internal linkage into one: MergedGlobals ● Allows globals to be addressed using offsets from a base pointer ● Can reduce the number of registers used ● Modpost uses symbol names to look for section mismatches ● MergedGlobals breaks modpost (false positive section mismatches) ● Current solution: use -mno-global-merge to stop global merging ● Updates to modpost may allow this optimization to be enabled again LLVMLinux project Deprecated clang options ● clang options have been deprecated -KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) +KBUILD_CFLAGS += $(call cc-option, -fsanitize=undefined-trap) +KBUILD_CFLAGS += $(call cc-option, -fsanitize-undefined-trap-on-error) LLVMLinux project ARM eabi support ● Clang emits code which uses the “aeabi” ARM calls which are implemented in compiler-rt (equivalient to libgcc) ● Compiler-rt doesn't easily cross compile yet... void __aeabi_memcpy(void *dest, const void *src, size_t n) void __aeabi_memmove(void *dest, const void *src, size_t n) void __aeabi_memset(void *s, size_t n, int c) LLVMLinux project Variable Length Arrays In Structs ● VLAIS isn't supported by Clang (undocumented gcc extension) char vla[n]; /* Supported, C99/C11 */ struct { char flexible_member[]; /* Supported, C99/C11 */ } struct_with_flexible_member; struct { char vlais[n]; /* Explicitly not allowed by C99/C11 */ } variable_length_array_in_struct; ● VLAIS is used in the Linux kernel in a number of places, spreading mostly through reusing patterns from data structures found in crypto LLVMLinux project VLAIS Removal Example - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(hash)]; - } desc; + char desc[sizeof(struct shash_desc) + + crypto_shash_descsize(hash)] CRYPTO_MINALIGN_ATTR; + struct shash_desc *shash = (struct shash_desc *)desc; unsigned int i; - desc.shash.tfm = hash; + shash->tfm = hash; (from crypto/hmac.c) LLVMLinux project VLAIS Removal Example (cont.) (the missing pieces) #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) #define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN #define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN))) struct shash_desc { struct crypto_shash *tfm; u32 flags; void *__ctx[] CRYPTO_MINALIGN_ATTR; }; LLVMLinux project Status of VLAIS in the Linux Kernel ● USB Gadget patch is in mainline ● Mac80211 patch is in mainline ● Netfilter patch is in mainline ● Only the VLAIS patches for crypto are left: (apparmor, btrfs, dm-crypt, hmac, libcrc32c, testmgr) LLVMLinux project How Can You Help? ● Make it known you want to be able to use Clang to compile the kernel ● Test LLVMLinux patches ● Report bugs to the mailing list ● Help get LLVMLinux patches upstream ● Work on unsupported features and Bugs ● Submit new targets and arch support ● Patches welcome LLVMLinux project Embrace the Dragon. He's cuddly. Thank you http://llvm.linuxfoundation.org LLVMLinux project Contribute to the LLVMLinux Project ● Project wiki page – http://llvm.linuxfoundation.org ● Project Mailing List – http://lists.linuxfoundation.org/mailman/listinfo/llvmlinux – http://lists.linuxfoundation.org/pipermail/llvmlinux/ ● IRC Channel – #llvmlinux on OFTC – http://buildbot.llvm.linuxfoundation.org/irclogs/OFTC/%23llvmlinux/ ● LLVMLinux Community on Google Plus LLVMLinux project.
Load more

Recommended publications
  • Open Source Projects As Incubators of Innovation
    RESEARCH CONTRIBUTIONS TO ORGANIZATIONAL SOCIOLOGY AND INNOVATION STUDIES / STUTTGARTER BEITRÄGE ZUR ORGANISATIONS- UND INNOVATIONSSOZIOLOGIE SOI Discussion Paper 2017-03 Open Source Projects as Incubators of Innovation From Niche Phenomenon to Integral Part of the Software Industry Jan-Felix Schrape Institute for Social Sciences Organizational Sociology and Innovation Studies Jan-Felix Schrape Open Source Projects as Incubators of Innovation. From Niche Phenomenon to Integral Part of the Software Industry. SOI Discussion Paper 2017-03 University of Stuttgart Institute for Social Sciences Department of Organizational Sociology and Innovation Studies Seidenstr. 36 D-70174 Stuttgart Editor Prof. Dr. Ulrich Dolata Tel.: +49 711 / 685-81001 [email protected] Managing Editor Dr. Jan-Felix Schrape Tel.: +49 711 / 685-81004 [email protected] Research Contributions to Organizational Sociology and Innovation Studies Discussion Paper 2017-03 (May 2017) ISSN 2191-4990 © 2017 by the author(s) Jan-Felix Schrape is senior researcher at the Department of Organizational Sociology and Innovation Studies, University of Stuttgart (Germany). [email protected] Additional downloads from the Department of Organizational Sociology and Innovation Studies at the Institute for Social Sciences (University of Stuttgart) are filed under: http://www.uni-stuttgart.de/soz/oi/publikationen/ Abstract Over the last 20 years, open source development has become an integral part of the software industry and a key component of the innovation strategies of all major IT providers. Against this backdrop, this paper seeks to develop a systematic overview of open source communities and their socio-economic contexts. I begin with a recon- struction of the genesis of open source software projects and their changing relation- ships to established IT companies.
    [Show full text]
  • MINCS - the Container in the Shell (Script)
    MINCS - The Container in the Shell (script) - Masami Hiramatsu <[email protected]> Tech Lead, Linaro Ltd. Open Source Summit Japan 2017 LEADING COLLABORATION IN THE ARM ECOSYSTEM Who am I... Masami Hiramatsu - Linux kernel kprobes maintainer - Working for Linaro as a Tech Lead LEADING COLLABORATION IN THE ARM ECOSYSTEM Demo # minc top # minc -r /opt/debian/x86_64 # minc -r /opt/debian/arm64 --arch arm64 LEADING COLLABORATION IN THE ARM ECOSYSTEM What Is MINCS? My Personal Fun Project to learn how linux containers work :-) LEADING COLLABORATION IN THE ARM ECOSYSTEM What Is MINCS? Mini Container Shell Scripts (pronounced ‘minks’) - Container engine implementation using POSIX shell scripts - It is small (~60KB, ~2KLOC) (~20KB in minimum) - It can run on busybox - No architecture dependency (* except for qemu/um mode) - No need for special binaries (* except for libcap, just for capsh --exec) - Main Features - Namespaces (Mount, PID, User, UTS, Net*) - Cgroups (CPU, Memory) - Capabilities - Overlay filesystem - Qemu cross-arch/system emulation - User-mode-linux - Image importing from dockerhub And all are done by CLI commands :-) LEADING COLLABORATION IN THE ARM ECOSYSTEM Why Shell Script? That is my favorite language :-) - Easy to understand for *nix administrators - Just a bunch of commands - Easy to modify - Good for prototyping - Easy to deploy - No architecture dependencies - Very small - Able to run on busybox (+ libcap is perfect) LEADING COLLABORATION IN THE ARM ECOSYSTEM MINCS Use-Cases For Learning - Understand how containers work For Development - Prepare isolated (cross-)build environment For Testing - Test new applications in isolated environment - Test new kernel features on qemu using local tools For products? - Maybe good for embedded devices which has small resources LEADING COLLABORATION IN THE ARM ECOSYSTEM What Is A Linux Container? There are many linux container engines - Docker, LXC, rkt, runc, ..
    [Show full text]
  • Kernel Boot-Time Tracing
    Kernel Boot-time Tracing Linux Plumbers Conference 2019 - Tracing Track Masami Hiramatsu <[email protected]> Linaro, Ltd. Speaker Masami Hiramatsu - Working for Linaro and Linaro members - Tech Lead for a Landing team - Maintainer of Kprobes and related tracing features/tools Why Kernel Boot-time Tracing? Debug and analyze boot time errors and performance issues - Measure performance statistics of kernel boot - Analyze driver init failure - Debug boot up process - Continuously tracing from boot time etc. What We Have There are already many ftrace options on kernel command line ● Setup options (trace_options=) ● Output to printk (tp_printk) ● Enable events (trace_events=) ● Enable tracers (ftrace=) ● Filtering (ftrace_filter=,ftrace_notrace=,ftrace_graph_filter=,ftrace_graph_notrace=) ● Add kprobe events (kprobe_events=) ● And other options (alloc_snapshot, traceoff_on_warning, ...) See Documentation/admin-guide/kernel-parameters.txt Example of Kernel Cmdline Parameters In grub.conf linux /boot/vmlinuz-5.1 root=UUID=5a026bbb-6a58-4c23-9814-5b1c99b82338 ro quiet splash tp_printk trace_options=”sym-addr” trace_clock=global ftrace_dump_on_oops trace_buf_size=1M trace_event=”initcall:*,irq:*,exceptions:*” kprobe_event=”p:kprobes/myevent foofunction $arg1 $arg2;p:kprobes/myevent2 barfunction %ax” What Issues? Size limitation ● kernel cmdline size is small (< 256bytes) ● A half of the cmdline is used for normal boot Only partial features supported ● ftrace has too complex features for single command line ● per-event filters/actions, instances, histograms. Solutions? 1. Use initramfs - Too late for kernel boot time tracing 2. Expand kernel cmdline - It is not easy to write down complex tracing options on bootloader (Single line options is too simple) 3. Reuse structured boot time data (Devicetree) - Well documented, structured data -> V1 & V2 series based on this. Boot-time Trace: V1 and V2 series V1 and V2 series posted at June.
    [Show full text]
  • LVC20-108 Arm64 Linux Kernel Architecture Update
    Arm64 Linux Kernel architecture update Matteo Carlini Director, Software Technology Management Arm – Open Source Software A-profile Architecture new feature names! https://developer.arm.com/architectures/cpu-architecture/a-profile/exploration-tools/feature-names-for-a-profile A-profile features: arm64 kernel support table https://developer.arm.com/tools-and-software/open-source-software/linux-kernel/architecture-and-kvm-enablement A-class architecture kernel enablement – Mar 20 TTS2UXN A64ISA AA32HPD PAUTH CNTS PMU S2FW FHM TTPBHA C B Trace LSE LSE IESB LSMAOC Debug SHA PMU RDMA CompNum JSconv S-EL2 SM SM TTCNP TTST VMID16 HPD v8.3 DIT SHA UAO v8.1 v8.2 RAS v8.4 IDST RCPC CCIDX DotProd ATS1E1 LOR VHE DFE CondM TTRe NV RCPC RAS LP16 m PAN TTHM MPAM AMU TTL NV Debug LVA TLBI VPIPT LPA DCPOP EVT DoPD GTG ECV MTPMU ETS SVE2 SPE SpecRest MPAM CTSS PMU PredInv PAuth2/ Future FGT FPAC architectures v8.0 RNG BT v8.5 v8.6 F64MM DGH DCCVADP MemTag Enablement complete TME EOPD CSEH F32MM TWED Enablement ongoing Enablement TBD SB CMODX I8MM BF16 FRINT CondM AMU N/A – no Kernel impact A-class architecture kernel enablement – Today TTS2UXN A64ISA AA32HPD PAUTH PMU FHM TTPBHA CNTSC S2FWB S-EL2 LSE LSE IESB LSMAOC TTST SHA PMU RDMA CompNum JSconv RAS SM SM TTCNP VMID16 HPD v8.3 DFE DIT SHA UAO TTRem v8.4 v8.1 v8.2 IDST RCPC CCIDX DotProd ATS1E1 LOR VHE Trace CondM NV Debug RCPC RAS LP16 PAN TTHM MPAM AMU Debug LVA NV TLBI TTL VPIPT LPA DCPOP GTG SPE SpecRest ECV MTPMU ETS SVE2 PMU PredInv MPAM CTSS RNG MemTag PAuth2/ Future FGT FPAC architectures v8.0
    [Show full text]
  • Hiding Process Memory Via Anti-Forensic Techniques
    DIGITAL FORENSIC RESEARCH CONFERENCE Hiding Process Memory via Anti-Forensic Techniques By: Frank Block (Friedrich-Alexander Universität Erlangen-Nürnberg (FAU) and ERNW Research GmbH) and Ralph Palutke (Friedrich-Alexander Universität Erlangen-Nürnberg) From the proceedings of The Digital Forensic Research Conference DFRWS USA 2020 July 20 - 24, 2020 DFRWS is dedicated to the sharing of knowledge and ideas about digital forensics research. Ever since it organized the first open workshop devoted to digital forensics in 2001, DFRWS continues to bring academics and practitioners together in an informal environment. As a non-profit, volunteer organization, DFRWS sponsors technical working groups, annual conferences and challenges to help drive the direction of research and development. https://dfrws.org Forensic Science International: Digital Investigation 33 (2020) 301012 Contents lists available at ScienceDirect Forensic Science International: Digital Investigation journal homepage: www.elsevier.com/locate/fsidi DFRWS 2020 USA d Proceedings of the Twentieth Annual DFRWS USA Hiding Process Memory Via Anti-Forensic Techniques Ralph Palutke a, **, 1, Frank Block a, b, *, 1, Patrick Reichenberger a, Dominik Stripeika a a Friedrich-Alexander Universitat€ Erlangen-Nürnberg (FAU), Germany b ERNW Research GmbH, Heidelberg, Germany article info abstract Article history: Nowadays, security practitioners typically use memory acquisition or live forensics to detect and analyze sophisticated malware samples. Subsequently, malware authors began to incorporate anti-forensic techniques that subvert the analysis process by hiding malicious memory areas. Those techniques Keywords: typically modify characteristics, such as access permissions, or place malicious data near legitimate one, Memory subversion in order to prevent the memory from being identified by analysis tools while still remaining accessible.
    [Show full text]
  • Hdcp Support in Optee
    HDCP SUPPORT IN OPTEE PRODUCT PRESENTATION Linaro Multimedia Working Group MICR ADVANCED TECHNOLOGIES • https://www.linaro.org/ SEPTEMBER 2019 Agenda • Quick introduction to HDCP • Secure Video Path overview • Current HDCP control in Linux • Proposal to control HDCP in OPTEE • Questions HDCP OVERVIEW 3 HDCP : High bandwidth Digital Content Protection • A digital copy protection developed by Intel™ to prevent copying of digital and audio video content. Before sending data, the source device shall check the destination device is authorized to received it. If so, the source device encrypts the data, only the destination device can decrypt. - data encryption - prevent non-licensed devices from receiving content • Android and Linux NXP bsp manage HDCP at Linux Level, through libDRM. So nothing prevent a user to disable HDCP protection while secure content is under playback. It is a security holes in the Secure Video Path. • HDCP support currently under development for wayland/Weston: https://gitlab.freedesktop.org/wayland/weston/merge_requests/48 • No Open Source solution exists to manage HDCP in secure mode. • HDCP versions: ▪ HDCP 1.X: Hacked: Master key published (leak/reverse engineering) ▪ HDCP 2.0: Hacked before release ▪ HDCP 2.1: Hacked before release ▪ HDCP 2.2: Not yet hacked 4 ▪ HDCP 2.3: Not yet hacked HDCP control state Machine Content with HDCP protection mandatory no yes Local display Local display yes no yes no Video displayed Video displayed without HDCP Digital Display without HDCP Digital Display encryption encryption yes no yes no It means we have analog display Video displayed Video displayed HDCP supported without HDCP HDCP supported without HDCP encryption encryption yes no yes no Video displayed Video displayed without Widevine/PlayReady To Video not displayed Application to decide if HDCP check current HDCP version Application to display a Warning 5 HDCP encryption message HDCP Unauthorized, encryption to be used >= expected HDCP version Content Disabled.' Error.
    [Show full text]
  • Improving the Performance of Hybrid Main Memory Through System Aware Management of Heterogeneous Resources
    IMPROVING THE PERFORMANCE OF HYBRID MAIN MEMORY THROUGH SYSTEM AWARE MANAGEMENT OF HETEROGENEOUS RESOURCES by Juyoung Jung B.S. in Information Engineering, Korea University, 2000 Master in Computer Science, University of Pittsburgh, 2013 Submitted to the Graduate Faculty of the Kenneth P. Dietrich School of Arts and Sciences in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Computer Science University of Pittsburgh 2016 UNIVERSITY OF PITTSBURGH KENNETH P. DIETRICH SCHOOL OF ARTS AND SCIENCES This dissertation was presented by Juyoung Jung It was defended on December 7, 2016 and approved by Rami Melhem, Ph.D., Professor at Department of Computer Science Bruce Childers, Ph.D., Professor at Department of Computer Science Daniel Mosse, Ph.D., Professor at Department of Computer Science Jun Yang, Ph.D., Associate Professor at Electrical and Computer Engineering Dissertation Director: Rami Melhem, Ph.D., Professor at Department of Computer Science ii IMPROVING THE PERFORMANCE OF HYBRID MAIN MEMORY THROUGH SYSTEM AWARE MANAGEMENT OF HETEROGENEOUS RESOURCES Juyoung Jung, PhD University of Pittsburgh, 2016 Modern computer systems feature memory hierarchies which typically include DRAM as the main memory and HDD as the secondary storage. DRAM and HDD have been extensively used for the past several decades because of their high performance and low cost per bit at their level of hierarchy. Unfortunately, DRAM is facing serious scaling and power consumption problems, while HDD has suffered from stagnant performance improvement and poor energy efficiency. After all, computer system architects have an implicit consensus that there is no hope to improve future system’s performance and power consumption unless something fundamentally changes.
    [Show full text]
  • Review Der Linux Kernel Sourcen Von 4.9 Auf 4.10
    Review der Linux Kernel Sourcen von 4.9 auf 4.10 Reviewed by: Tested by: stecan stecan Period of Review: Period of Test: From: Thursday, 11 January 2018 07:26:18 o'clock +01: From: Thursday, 11 January 2018 07:26:18 o'clock +01: To: Thursday, 11 January 2018 07:44:27 o'clock +01: To: Thursday, 11 January 2018 07:44:27 o'clock +01: Report automatically generated with: LxrDifferenceTable, V0.9.2.548 Provided by: Certified by: Approved by: Account: stecan Name / Department: Date: Friday, 4 May 2018 13:43:07 o'clock CEST Signature: Review_4.10_0_to_1000.pdf Page 1 of 793 May 04, 2018 Review der Linux Kernel Sourcen von 4.9 auf 4.10 Line Link NR. Descriptions 1 .mailmap#0140 Repo: 9ebf73b275f0 Stephen Tue Jan 10 16:57:57 2017 -0800 Description: mailmap: add codeaurora.org names for nameless email commits ----------- Some codeaurora.org emails have crept in but the names don't exist for them. Add the names for the emails so git can match everyone up. Link: http://lkml.kernel.org/r/[email protected] 2 .mailmap#0154 3 .mailmap#0160 4 CREDITS#2481 Repo: 0c59d28121b9 Arnaldo Mon Feb 13 14:15:44 2017 -0300 Description: MAINTAINERS: Remove old e-mail address ----------- The ghostprotocols.net domain is not working, remove it from CREDITS and MAINTAINERS, and change the status to "Odd fixes", and since I haven't been maintaining those, remove my address from there. CREDITS: Remove outdated address information ----------- This address hasn't been accurate for several years now.
    [Show full text]
  • Implantación De Linux Sobre Microcontroladores
    Embedded Linux system development Embedded Linux system development DSI Embedded Linux Free Electrons Developers © Copyright 2004-2018, Free Electrons. Creative Commons BY-SA 3.0 license. Latest update: March 14, 2018. Document updates and sources: http://free-electrons.com/doc/training/embedded-linux Corrections, suggestions, contributions and translations are welcome! DSI - FCEIA http://dsi.fceia.unr.edu.ar 1/263 Derechos de copia © Copyright 2018, Luciano Diamand Licencia: Creative Commons Attribution - Share Alike 3.0 http://creativecommons.org/licenses/by-sa/3.0/legalcode Ud es libre de: I copiar, distribuir, mostrar y realizar el trabajo I hacer trabajos derivados I hacer uso comercial del trabajo Bajo las siguientes condiciones: I Atribuci´on. Debes darle el cr´editoal autor original. I Compartir por igual. Si altera, transforma o construye sobre este trabajo, usted puede distribuir el trabajo resultante solamente bajo una licencia id´enticaa ´esta. I Para cualquier reutilizaci´ono distribuci´on,debe dejar claro a otros los t´erminos de la licencia de este trabajo. I Se puede renunciar a cualquiera de estas condiciones si usted consigue el permiso del titular de los derechos de autor. El uso justo y otros derechos no se ven afectados por lo anterior. DSI - FCEIA http://dsi.fceia.unr.edu.ar 2/263 Hiperv´ınculosen el documento Hay muchos hiperv´ınculosen el documento I Hiperv´ıncluosregulares: http://kernel.org/ I Enlaces a la documentaci´ondel Kernel: Documentation/kmemcheck.txt I Enlaces a los archivos fuente y directorios del kernel: drivers/input include/linux/fb.h I Enlaces a declaraciones, definiciones e instancias de los simbolos del kernel (funciones, tipos, datos, estructuras): platform_get_irq() GFP_KERNEL struct file_operations DSI - FCEIA http://dsi.fceia.unr.edu.ar 3/263 Introducci´ona Linux Embebido Introducci´ona DSI Linux Embebido Embedded Linux Developers Free Electrons © Copyright 2004-2018, Free Electrons.
    [Show full text]
  • SFO17-409 TSC OSS Toolchain Discussion David a Rusling Ryan S
    SFO17-409 TSC OSS Toolchain Discussion David A Rusling Ryan S. Arnold, Maxim Kuvyrkov linaro Committee Confidential @ 2017 Overview ● Toolchain work in Linaro ○ GCC ■ ARM GNU funding to TCWG and the effect on Linaro TCWG's roadmap ■ Transition of GNU toolchain release to ARM in 2018 (august) ■ ARMv8.2 ■ SVE upstream progress ● GDB SVE enablement moving forward ○ LLVM ■ ARMv8.2 ■ LLVM growth roadmap ■ SVE upstream progress ○ ILP32 ■ ILP32 toolchain progress update ○ FDPIC Toolchain ● Discussion ○ Does this all fit together? ○ Is there anything that we’re missing? linaro Committee Confidential @ 2017 ENGINEERS AND DEVICES WORKING TOGETHER Key GNU Deliverables 1.TCWG-1232 Link Time Optimization tuning for AArch64 2.TCWG-64 Sign/Zero-Extension Elimination optimizations 3.TCWG-1233 Investigate scalability of libgomp on SPEC CPU2017 4.TCWG-1207 ILP32 Toolchain 5.TCWG-159 GDB Kernel Awareness 6.TCWG-1035 GDB target description rework for SVE enablement 7.TCWG-1160, TCWG-1161 OpenOCD AArch64 & GDB Remote debugging interoperability 8.TCWG-935 Automated regression testing of upstream branches 9.TCWG-1231 Automated benchmarking of upstream branches linaro Committee Confidential @ 2017 ENGINEERS AND DEVICES WORKING TOGETHER ARM funding of GNU work & Need for LLVM ● High volume of LLVM work needed to be done (see LLVM Growth Roadmap slides). Linaro Exec Mgmt was planning to propose TCWG transition to LLVM in the future. This initial proposal was shared with ARM. ● ARM expressed concern as there is still important GNU work Linaro can do especially on behalf of ARM enterprise workloads. ● ARM has decided to fund three existing (full-time equivalent) TCWG engineers to continue to focus on GNU for at least the next year.
    [Show full text]
  • Thread Scheduling in Multi-Core Operating Systems Redha Gouicem
    Thread Scheduling in Multi-core Operating Systems Redha Gouicem To cite this version: Redha Gouicem. Thread Scheduling in Multi-core Operating Systems. Computer Science [cs]. Sor- bonne Université, 2020. English. tel-02977242 HAL Id: tel-02977242 https://hal.archives-ouvertes.fr/tel-02977242 Submitted on 24 Oct 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Ph.D thesis in Computer Science Thread Scheduling in Multi-core Operating Systems How to Understand, Improve and Fix your Scheduler Redha GOUICEM Sorbonne Université Laboratoire d’Informatique de Paris 6 Inria Whisper Team PH.D.DEFENSE: 23 October 2020, Paris, France JURYMEMBERS: Mr. Pascal Felber, Full Professor, Université de Neuchâtel Reviewer Mr. Vivien Quéma, Full Professor, Grenoble INP (ENSIMAG) Reviewer Mr. Rachid Guerraoui, Full Professor, École Polytechnique Fédérale de Lausanne Examiner Ms. Karine Heydemann, Associate Professor, Sorbonne Université Examiner Mr. Etienne Rivière, Full Professor, University of Louvain Examiner Mr. Gilles Muller, Senior Research Scientist, Inria Advisor Mr. Julien Sopena, Associate Professor, Sorbonne Université Advisor ABSTRACT In this thesis, we address the problem of schedulers for multi-core architectures from several perspectives: design (simplicity and correct- ness), performance improvement and the development of application- specific schedulers.
    [Show full text]
  • Embedded Linux Conference Europe 2019
    Embedded Linux Conference Europe 2019 Linux kernel debugging: going beyond printk messages Embedded Labworks By Sergio Prado. São Paulo, October 2019 ® Copyright Embedded Labworks 2004-2019. All rights reserved. Embedded Labworks ABOUT THIS DOCUMENT ✗ This document is available under Creative Commons BY- SA 4.0. https://creativecommons.org/licenses/by-sa/4.0/ ✗ The source code of this document is available at: https://e-labworks.com/talks/elce2019 Embedded Labworks $ WHOAMI ✗ Embedded software developer for more than 20 years. ✗ Principal Engineer of Embedded Labworks, a company specialized in the development of software projects and BSPs for embedded systems. https://e-labworks.com/en/ ✗ Active in the embedded systems community in Brazil, creator of the website Embarcados and blogger (Portuguese language). https://sergioprado.org ✗ Contributor of several open source projects, including Buildroot, Yocto Project and the Linux kernel. Embedded Labworks THIS TALK IS NOT ABOUT... ✗ printk and all related functions and features (pr_ and dev_ family of functions, dynamic debug, etc). ✗ Static analysis tools and fuzzing (sparse, smatch, coccinelle, coverity, trinity, syzkaller, syzbot, etc). ✗ User space debugging. ✗ This is also not a tutorial! We will talk about a lot of tools and techniches and have fun with some demos! Embedded Labworks DEBUGGING STEP-BY-STEP 1. Understand the problem. 2. Reproduce the problem. 3. Identify the source of the problem. 4. Fix the problem. 5. Fixed? If so, celebrate! If not, go back to step 1. Embedded Labworks TYPES OF PROBLEMS ✗ We can consider as the top 5 types of problems in software: ✗ Crash. ✗ Lockup. ✗ Logic/implementation error. ✗ Resource leak. ✗ Performance.
    [Show full text]