[B! kernel] dannã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

dann id:dann

kernelã«é–¢ã™ã‚‹dannã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (56)

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ã‚½ã‚±ãƒƒãƒˆAPIãŒé…ã™ãŽã‚‹ï¼Ÿæ–°ãŸãªio_uringã‚’è©¦ã™ï¼
æ–°ã—ã„APIãŒä½œã‚‰ã‚Œã‚‹ãŸã³ã«ã€ç§ãŸã¡ã¯ã€å¤ã„APIã‚’ç½®ãæ›ãˆã‚‹ã ã‘ã§é«˜é€ŸåŒ–ã¨ã„ã†å¤¢ã‚’ã¿ã¾ã™ã€‚ä½•åº¦å¤¢ç ´ã‚Œã¦ã‚‚ã€é«˜é€ŸãªAPIãŒè¿½åŠ ã•ã‚ŒãŸã¨èžã‘ã°ã€è©¦ã•ãšã«ã¯ã„ã‚‰ã‚Œã¾ã›ã‚“ã‚ˆãï¼ ä»Šå›žã¯ã€Linuxã‚«ãƒ¼ãƒãƒ«5.1ã§è¿½åŠ ã•ã‚ŒãŸio_uringã‚’ä½¿ã£ã¦ã€Rustã®asyncãƒ©ãƒ³ã‚¿ã‚¤ãƒ ã‚’å®Ÿè£…ã—ã€gRPCã‚µãƒ¼ãƒã®ãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯ã‚’å®Ÿè¡Œã—ã¦ã¿ã¾ã—ãŸã€‚ io_uringã¨ã¯io_uringã¯ã€ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã¨ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®éžåŒæœŸI/Oã®ãŸã‚ã«é–‹ç™ºã•ã‚Œã¾ã—ãŸã€‚åŒæœŸã‚ˆã‚Šã‚‚éžåŒæœŸã®ã»ã†ãŒãŠã—ã‚ƒã‚Œã€ãã†ã„ã†é›°å›²æ°—ã‚ã‚Šã¾ã™ã‚ˆãï¼ã‚¯ãƒ©ã‚¦ãƒ‰ãƒã‚¤ãƒ†ã‚£ãƒ–ã‚‚ã€éžåŒæœŸã«APIã‚’ä»‹ã—ã¦ã€ãªã‚“ã‹ã‚„ã£ã¦ã‚‹ã‚„ã¤ã§ã™ã‚ˆãã€‚ io_uringã®ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ã‚¤ã‚¹ã¯ã€é«˜ã„æ€§èƒ½ã‚’ç›®æŒ‡ã—ã€1ï¼‰ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¨ã‚«ãƒ¼ãƒãƒ«é–“ã§ã®ãƒ¡ãƒ¢ãƒªã‚³ãƒ”ãƒ¼ã‚’é¿ã‘ã‚‹ã€2ï¼‰è¤‡æ•°ã®I/Oè¦æ±‚ã‚’ä¸€åº¦ã«ã‚«ãƒ¼ãƒãƒ«ã«ä¼ãˆã‚‹ã“ã¨ãŒã§ãã‚‹ã€ã¨ã„ã†å·¥å¤«ãŒã•ã‚Œã¦ã„ã¾ã™ã€‚ ä¸‹å›³ã®ã‚ˆã†ã«ã€ã‚¢ãƒ—ãƒªã‚±
dann 2022/01/01
kernel
ãƒªãƒ³ã‚¯
A Heavily Commented Linux Kernel Source Code
dann 2019/08/21
linux

kernel
ãƒªãƒ³ã‚¯
Linux ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©ãƒ¼ã®ã‚³ã‚¢å®Ÿè£…ã¨ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ« - Qiita
Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article? ã¯ã˜ã‚ã« ã“ã‚Œã¯ Linux Advent Calendar 2016 ã®ç¬¬ 11 æ—¥ç›®ã®è¨˜äº‹ã§ã™ã€‚Linux ã®ã‚¿ã‚¹ã‚¯ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©ãƒ¼ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚„é–¢é€£ã™ã‚‹ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆãªã©ã‚’èªã‚“ã§åˆ†ã‹ã£ãŸã“ã¨ã‚’ã¾ã¨ã‚ã¾ã—ãŸã€‚ã¨ã¦ã‚‚é•·ã„ã§ã™ãƒ»ãƒ»ãƒ» ã¯ã˜ã‚ã«ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©ãƒ¼ã®ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã¨é‡è¦ãªæ¦‚å¿µã‚’ç´¹ä»‹ã—ã€ãã®å¾Œã¯ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ©ãƒ¼ã‚³ã‚¢ã¨ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã®å®Ÿè£…ã«ã¤ã„ã¦åˆ†ã‹ã£ãŸã“ã¨ã‚’å»¶ã€…ã¨è¿°ã¹ã¾ã™ã€‚èª¿ã¹ãã‚Œãªã‹ã£ãŸã“ã¨ã‚„åˆ†ã‹ã‚‰ãªã‹ã£ãŸã“ã¨ã¯ TODO ã«æ®‹ã—ãŸã®ã§ã€ã‚³ãƒ¡ãƒ³ãƒˆæ¬„ã¨ã‹ãƒ„ã‚¤ãƒƒã‚¿ãƒ¼ã§æ•™ãˆã¦ã‚‚ã‚‰ãˆã‚‹ã¨å¬‰ã—ã„ã§ã™ã€‚é–“é•ã„ã®æŒ‡æ‘˜ã‚‚å¤§æ“è¿Žã§ã™ã€‚ ã¡ãªã¿ã«ç§ãŒèª
dann 2017/01/03
linux

kernel
ãƒªãƒ³ã‚¯
GitHub - 0xAX/linux-insides: A little bit about a linux kernel
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dann 2016/12/04
linux

kernel
ãƒªãƒ³ã‚¯
Monitoring and Tuning the Linux Networking Stack: Receiving Data | Packagecloud Blog
Monitoring and Tuning the Linux Networking Stack: Receiving Data TL;DR This blog post explains how computers running the Linux kernel receive packets, as well as how to monitor and tune each component of the networking stack as packets flow from the network toward userland programs. UPDATEÂ Weâ€™ve released the counterpart to this post:Â Monitoring and Tuning the Linux Networking Stack: Sending Data.
dann 2016/06/26
network

kernel

performance
ãƒªãƒ³ã‚¯
Scaling Userspace @ Facebook
dann 2015/01/04
facebook

linux

kernel
ãƒªãƒ³ã‚¯
Linux Kernel Hackå…¥é–€ç·¨ - Ï†(ãƒ»ãƒ»*)ã‚ž ï½³ï½°ï¾ã€€ã‚«ãƒ¼ãƒãƒ«ã¨ã‹å¼„ã£ãŸã‚Šã®ãƒ¡ãƒ¢
ã“ã®è¨˜äº‹ã¯Linux Advent Calendar 2014ã®25æ—¥ç›®ã§ã™ãƒ½(=Â´â–½`=)ï¾‰ ä»Šå›žã¯Linux Kernel Hackå…¥é–€ç·¨ã¨ã„ã†ã“ã¨ã§å…¥é–€çš„ãªã“ã¨ã‚’æ›¸ã„ã¦ã¿ãŸã„ã¨æ€ã„ã¾ã™ã€‚ ã¾ãšä½¿ç”¨ã™ã‚‹ç’°å¢ƒã§ã™ã‘ã©æœ€è¿‘å‡ºãŸã°ã£ã‹ã®Fedora 21ã®Workstationã«ã—ã¾ã—ãŸã€‚ã¾ã‚ã€ä»Šå›žã®å†…å®¹çš„ã«ã¯ãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã¯å•ã‚ãªã„ã‚“ã§ã™ãŒã€å¤šãã®äººãŒé¦´æŸ“ã‚“ã§ã„ã‚‹ã§ã‚ã‚ã†fedoraç³»ã¨ã„ã†ã‹ãƒ‘ãƒƒã‚±ãƒ¼ã‚¸ãƒžãƒãƒ¼ã‚¸ãƒ£ãŒyumã¨ã„ã†ã“ã¨ã§ã“ã‚Œã«ã—ã¦ã¿ã¾ã—ãŸã€‚ã€€è‡ªåˆ†ã¯æ™®æ®µArch Linuxãªã‚“ã§ã™ã‘ã©ã€ã“ã£ã¡ã ã¨kernelã®make installæ™‚ã«ã¡ã‚‡ã£ã¨ã—ãŸã‚¹ã‚¯ãƒªãƒ—ãƒˆã‚’æ›¸ãå¿…è¦ãŒã‚ã£ãŸã‚Šã™ã‚‹ã®ã‚‚ã‚ã£ã¦ã€fedoraã®ã»ã†ãŒæ‰‹è»½ã‹ãªã¨ã„ã†ã®ã‚‚ã‚ã‚Šã¾ã™ã€‚ ã‚«ãƒ¼ãƒãƒ«ã‚³ãƒ¼ãƒ‰ãƒ»ãƒªãƒ¼ãƒ‡ã‚£ãƒ³ã‚° ãƒ–ãƒ©ã‚¦ã‚¶ãƒ™ãƒ¼ã‚¹ã§ã‚³ãƒ¼ãƒ‰ãƒ»ãƒªãƒ¼ãƒ‡ã‚£ãƒ³ã‚° èªã‚ã‚‹ã‚½ãƒ¼ã‚¹ã¯å¤§æ¦‚ãƒ¡ã‚¤ãƒ³ãƒ©ã‚¤ãƒ³ã®ã‚«ãƒ¼ãƒãƒ«ã¨ã„ã†ã“ã¨ã«ãªã‚Šã¾ã™ãŒ
dann 2014/12/25
kernel
ãƒªãƒ³ã‚¯
Linux Storage Filesystem/MM Summit 2014ã‹ã‚‰ã®ä¾¿ã‚Š
Linux Storage Filesystem/MM Summit 2014ã‹ã‚‰ã®ä¾¿ã‚Šï¼šLinux Kernel Watchï¼ˆ1/2 ãƒšãƒ¼ã‚¸ï¼‰ ãŠä¹…ã—ã¶ã‚Šã§ã™ã€Linux Kernel WatchãŒå¸°ã£ã¦ãã¾ã—ãŸã€‚3æœˆã«è¡Œã‚ã‚ŒãŸã€ŒLinux Storage Filesystem/MM Summit 2014ã€ã®ä¸»ãªãƒˆãƒ”ãƒƒã‚¯ã‚’ç´¹ä»‹ã—ã¾ã™ã€‚ çš†ã•ã‚“ã€ãŠä¹…ã—ã¶ã‚Šã§ã™ã€‚ç§ã¯ä»Šãƒœã‚¹ãƒˆãƒ³ã§ã€ç±³ãƒ¬ãƒƒãƒ‰ãƒãƒƒãƒˆå¸¸é§ã¨ã„ã†ç«‹å ´ã§Red Hat Enterprise Linuxï¼ˆRHELï¼‰é–‹ç™ºã«æºã‚ã£ã¦ã„ã¾ã™ã€‚ ä»Šå›žã¯ã‚µãƒ³ãƒ•ãƒ©ãƒ³ã‚·ã‚¹ã‚³è¿‘éƒŠã®ãƒŠãƒ‘ãƒãƒ¬ãƒ¼ã§2014å¹´3æœˆ24ï½ž25æ—¥ã«è¡Œã‚ã‚ŒãŸã€ŒLinux Storage Filesystem/MM Summit 2014ã€ï¼ˆä»¥ä¸‹LSF/MMï¼‰ã®ä¸ã‹ã‚‰é¢ç™½ã‹ã£ãŸãƒˆãƒ”ãƒƒã‚¯ã‚’ãƒ”ãƒƒã‚¯ã‚¢ãƒƒãƒ—ã—ã¦ãŠå±Šã‘ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ LSF/MMã¯Linux Foundationä¸»å‚¬ã§è¡Œ
dann 2014/04/24
kernel
ãƒªãƒ³ã‚¯
Linux Block IO: Introducing Multi-queue SSD Access on Multi-core Systems
dann 2014/01/20
linux

kernel
ãƒªãƒ³ã‚¯
on swapping and kernels
There is much more to write about all the work we do at Facebook with memory management efficiency on our systems, but there was this one detour investigation in the middle of 2012 that I had to revisit recently courtesy of Wikipedia. There are lots of factors that make machines page out memory segments into disk, thus slowing everything down and locking software up â€“ from file system cache pressu
dann 2014/01/18
linux

kernel
ãƒªãƒ³ã‚¯
How The Kernel Manages Your Memory
After examining the virtual address layout of a process, we turn to the kernel and its mechanisms for managing user memory. Here is gonzo again: Linux processes are implemented in the kernel as instances of task_struct, the process descriptor. The mm field in task_struct points to the memory descriptor, mm_struct, which is an executive summary of a program's memory. It stores the start and end of
dann 2013/12/29
kernel

memory
ãƒªãƒ³ã‚¯
Basic Data Structures and Algorithms in the Linux Kernel - The Phrygian Cap
Thanks to Vijay D'Silva's brilliant answer in cstheory.stackexchange.com I have been reading some of the famous data structures and algorithms used in the Linux Kernel. And so can you. Linked lists, doubly linked lists, lock-free linked lists.B+ Trees with comments telling you what you can't find in the textbooks.Priority sorted lists used for mutexes, drivers, etc.Red-Black trees are used are use
dann 2013/12/29
kernel

datastructure
ãƒªãƒ³ã‚¯
LKML: Jovi Zhangwei: [ANNOUNCE] ktap 0.3 released
Dear, I'm pleased to announce that ktap released v0.3, the archive is available at: https://github.com/ktap/ktap/archive/v0.3.tar.gz = what's ktap? A New Script-based Dynamic Tracing Tool For Linux ktap have different design principles from Linux mainstream dynamic tracing language in that it's based on bytecode, so it doesn't depend upon GCC, doesn't require compiling kernel module for each scrip
dann 2013/11/11
kernel

linux
ãƒªãƒ³ã‚¯
Peeking into Linux kernel-land using /proc filesystem for quickâ€™nâ€™dirty troubleshooting - Tanel Poder Consulting
Peeking into Linux kernel-land using /proc filesystem for quickâ€™nâ€™dirty troubleshooting This blog entry is about modern Linuxes. In other words RHEL6 equivalents with 2.6.3x kernels and not the ancient RHEL5 with 2.6.18 kernel (wtf?!), which is the most common in enterprises unfortunately. And no, Iâ€™m not going to use kernel debuggers or SystemTap scripts here, just plain old â€œcat /proc/PID/xyzâ€ c
dann 2013/08/31
linux

kernel
ãƒªãƒ³ã‚¯
TCP Fast Openã‚’è©¦ã—ã¦ã¿ã‚‹ - milieuã®æ—¥è¨˜
kernel3.8ãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚Œã¦ã¤ã„ã«TCP Fast OpenãŒã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã€ã‚µãƒ¼ãƒã‚µã‚¤ãƒ‰å…±ã«å®Ÿè£…ã•ãŸã€‚ã‚«ãƒ¼ãƒãƒ«ã®ã‚½ãƒ¼ã‚¹ã‚’è¦‹ã¦ã¿ã‚‹ã¨ã‚„ã¯ã‚Šçµæ§‹ãªå¤‰æ›´ã§patchã§2000è¡Œãƒ¬ãƒ™ãƒ«ã‚‰ã—ãã€ã“ã‚Œä»•äº‹ã§å®Ÿè£…ã—ãŸããªã„ãªãƒ¼ã¨ã„ã†ã‹ãƒã‚°ã‚’å‡ºã™è‡ªä¿¡ãŒã‚ã‚‹ã¨ã„ã†ã®ãŒæ£ç›´ãªæ„Ÿæƒ³ã ãŒã€ã¨ã‚Šã‚ãˆãšå‹•ä½œæ¦‚è¦ãã‚‰ã„ã¯çŸ¥ã£ã¦ãŠã‹ãªã„ã¨ã¾ãšã„ã®ã§éŠã‚“ã§ã¿ãŸã€‚TCP Fast Openã®èªè¨¼ï¼Ÿéƒ¨åˆ†ã§AESã‚’ä½¿ã†ã‚‰ã—ãSandy Bridgeãªã‚‰AES-NIã‚’ä½¿ãˆã°CPUè² è·çš„ã«å•é¡Œãªã„ã‹ã¨ã‹èª¿ã¹ãŸã‹ã£ãŸãŒã€å®¶ã§ä½¿ç”¨ã—ã¦ã„ã‚‹PCã¯CPUãŒæ®‹å¿µãªãŒã‚‰Westmereãªã®ã§ãã‚Œã¯è«¦ã‚ãŸã€‚å‹•ã‹ã™ã«ã‚ãŸã‚ŠFedora18ã‚’ç”¨æ„ã—ãªã„ã¨ï¼ã¨æ€ã„ãŸã¡VMç’°å¢ƒã«ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã€‚ãã†ã„ãˆã°Fedora18ãŒãƒªãƒªãƒ¼ã‚¹ã•ã‚ŒãŸå½“åˆã¯VMwareã«ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã‚’è©¦ã¿ãŸãŒå¤±æ•—ã—ãŸã¨ã„ã†è‹¦ã„è¨˜æ†¶ãŒè˜‡ãˆã£ãŸãŒã€ä»Šå›žã¯Virtualboxã ã£ãŸãŠã‹ã’
dann 2013/07/20
kernel

network
ãƒªãƒ³ã‚¯
https://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf
dann 2013/07/17
ksm

kernel
ãƒªãƒ³ã‚¯
Google Code Archive - Long-term storage for Google Code Project Hosting.
Code Archive Skip to content Google About Google Privacy Terms
dann 2013/04/24
kernel

performance

linux
ãƒªãƒ³ã‚¯
IBM Presentations: Smart Planet Template
dann 2013/04/21
scheduler

cpu

linux

kernel

performance
ãƒªãƒ³ã‚¯
Seekwatcher
Seekwatcher generates graphs from blktrace runs to help visualize IO patterns and performance. It can plot multiple blktrace runs together, making it easy to compare the differences between different benchmark runs. Download Version 0.12 HG repo tar.gz of the latest commit Examples: Btrfs streaming writes across multiple devices Ext3 Btrfs and XFS creating 20 copies of the Linux kernel sources Ext
dann 2013/02/24
blktrace

visualization

kernel
ãƒªãƒ³ã‚¯
Blog Alpha Networking: kernelãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°(OSå…¨ä½“ç·¨)
2012å¹´12æœˆ7æ—¥é‡‘æ›œæ—¥ kernelãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°(OSå…¨ä½“ç·¨) linuxã‚µãƒ¼ãƒã®OSå…¨ä½“ã«åŠ¹ãã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ç®‡æ‰€ã¨ ãã®è¨å®šå€¤ã€ã¾ãŸãã®ç†ç”±ã‚’ã¾ã¨ã‚ã¦ãŠãã€‚ ã‚ãã¾ã§è‡ªåˆ†ã®ç’°å¢ƒã§ã¯ã“ã†ã—ãŸã€ã¨ã„ã†ã ã‘ã§ã‚ã‚Šã€ æä¾›ã™ã‚‹ã‚µãƒ¼ãƒ“ã‚¹ã”ã¨ã«æ¤œè¨ŽãŒå¿…è¦ã§ã‚ã‚‹ã€‚ ã©ã“ã‚’ã©ã†å¤‰æ›´ã™ã‚‹ã®ã‹ã€ã¾ãŸã¯å¤‰ãˆãªã„ã®ã‹ã€ãã®åˆ¤æ–ææ–™ã«ã¯ãªã‚‹ã ã‚ã†ã€‚ ã¾ãŸã€ãƒ¦ãƒ¼ã‚¶å˜ä½ã§åˆ¶é™ã‚’ã‹ã‘ã‚‹å ´åˆã‚’ã“ã¡ã‚‰ã‚’å‚ç…§ã—ã¦ã»ã—ã„ã€‚ /etc/sysctl.conf ã§è¨å®šã™ã‚‹ã€‚ â— å¤§è¦æ¨¡ã‚µã‚¤ãƒˆç”¨ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚° kernel.pid_max å‹•ä½œï¼špidã®æœ€å¤§æ•° è¨å®šå€¤ï¼š131072 ç†ç”±ï¼špidã‚’æž¯æ¸‡ã•ã›ãªã„ vm.max_map_count å‹•ä½œï¼šmmapã‚„mallocæ™‚ã«ãƒ¡ãƒ¢ãƒªã‚’ä»®æƒ³ç©ºé–“ã«ãƒžãƒƒãƒ”ãƒ³ã‚°ã§ãã‚‹æœ€å¤§ãƒšãƒ¼ã‚¸æ•° è¨å®šå€¤ï¼š30000 ç†ç”±ï¼šãƒžãƒƒãƒ”ãƒ³ã‚°ã§ããªããªã‚‹äº‹æ…‹ã‚’é˜²ã
dann 2013/02/21
kernel
ãƒªãƒ³ã‚¯
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