[B! kernel] Nnwwwã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

Nnwww id:Nnwww

kernelã«é–¢ã™ã‚‹Nnwwwã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (12)

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Linuxã‚«ãƒ¼ãƒãƒ«ãŒx86 microcodeã‚’æ‰±ã†å‡¦ç†ã«ã¤ã„ã¦ - Qiita
ã¯ã˜ã‚ã« ãŠä¹…ã—ã¶ã‚Šã§ã™ã€‚@akachichonã§ã™ã€‚ ã•ã¦ã€å½“åˆã¯ãƒ«ãƒ¼ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ å‘¨è¾ºã«é–¢ã™ã‚‹è¨˜äº‹ã‚’æ›¸ã“ã†ã¨ã—ã¾ã—ãŸãŒè‰²ã€…ã‚ã‚Šã€ä»Šå›žã¯ãƒžã‚¤ã‚¯ãƒã‚³ãƒ¼ãƒ‰ã‚¢ãƒƒãƒ—ãƒ‡ãƒ¼ãƒˆã«ã¤ã„ã¦æ›¸ãã¾ã—ãŸã€‚ ãªãŠã€å¼•ç”¨ã—ãŸã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚‚ã—ãã¯ç¢ºèªã«ä½¿ã£ãŸç’°å¢ƒã¯ã€ã€ŒUbuntu Server 19.10ã€ã§ã™ã€‚ Ubuntu Server19.10ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰å–å¾—æ–¹æ³•ã«ã¤ã„ã¦ã¯ã€è£œè¶³ã€ŒUbuntu Linuxã®ã‚«ãƒ¼ãƒãƒ«ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰å–å¾—æ–¹æ³•ã€ã‚’å‚ç…§ã—ã¦ãã ã•ã„ã€‚ ãƒ«ãƒ¼ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚¤ãƒ¡ãƒ¼ã‚¸ã«ã¤ã„ã¦ Ubuntu Server19.10ã®ãƒ«ãƒ¼ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚¤ãƒ¡ãƒ¼ã‚¸ã¯ã€/boot/initrd.img-5.3.0-24-genericã§ã™ã€‚ãƒ«ãƒ¼ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚¤ãƒ¡ãƒ¼ã‚¸ã¯Ubuntuã«é™ã‚‰ãšã€å¤šãã®Linuxãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ãƒ¥ãƒ¼ã‚·ãƒ§ãƒ³ã§å…±é€šã ã¨æ€ã„ã¾ã™ã€‚ ã•ã¦ã€ä¸èº«ã‚’ç¢ºèªã—ã¾ã—ã‚‡ã†ã€‚ãƒ«ãƒ¼ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚¤ãƒ¡
Nnwww 2024/12/31
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kernel

linux

cpu
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VFSã¨ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®åŸºç¤ŽæŠ€è¡“
ç¾åœ¨ã®Linuxã¯ã€è¤‡æ•°ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ãŒé¸æŠžã§ãã‚‹ã€‚ã ãŒã€ã©ã‚Œã‚’é¸ã¹ã°ã‚ˆã„ã®ã ã‚ã†ã‹ï¼Ÿ ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã«ã¯ãã‚Œãžã‚Œç‰¹æ€§ãŒã‚ã‚‹ã€‚æœ¬é€£è¼‰ã§ã¯ã€åŸºç¤ŽæŠ€è¡“ã‹ã‚‰å„ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ç‰¹å¾´ã€ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ã‚’æ¤œè¨¼ã™ã‚‹ã€‚ï¼ˆç·¨é›†å±€ï¼‰ ã‚«ãƒ¼ãƒãƒ«2.4ã‹ã‚‰ã€Linuxã¯æœ¬æ ¼çš„ã«ã‚¨ãƒ³ã‚¿ãƒ¼ãƒ—ãƒ©ã‚¤ã‚ºã‚’æ„è˜ã—ãŸOSã¨ã—ã¦ã®æ©Ÿèƒ½ã‚’å‚™ãˆã‚‹ã‚ˆã†ã«ãªã£ãŸã€‚ãã®ç‰¹å¾´ã®1ã¤ãŒãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ä¿¡é ¼æ€§ã§ã‚ã‚‹ã€‚Linuxã®å ´åˆã€å½“åˆã«å®Ÿè£…ã•ã‚ŒãŸext2ã‹ã‚‰ã‚¸ãƒ£ãƒ¼ãƒŠãƒªãƒ³ã‚°ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã§ã‚ã‚‹ext3ã‚„ReiserFSã€ãã—ã¦å•†ç”¨ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã¨ã—ã¦ç™ºå±•ã—ã¦ããŸJFSã‚„XFSãŒå–ã‚Šè¾¼ã¾ã‚Œã€è¤‡æ•°ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ãŒé¸æŠžã§ãã‚‹ã‚ˆã†ã«ãªã£ã¦ã„ã‚‹ã€‚ æœ¬é€£è¼‰ã¯ã€ã“ã‚Œã‚‰ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®é•ã„ã‚’æŠŠæ¡ã—ã€ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚’é¸æŠžã™ã‚‹ãŸã‚ã®æŒ‡é‡ã¨ãªã‚‹ã‚ˆã†ãªæƒ…å ±ã‚’æä¾›ã™ã‚‹ã€‚ ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã¨ã¯ ç§ãŸã¡ã¯é€šå¸¸ã€ãƒ‡ãƒ¼ã‚¿ã®ã€Œèªã¿è¾¼ã¿ã€ã€Œæ›¸ãè¾¼ã¿ã€ãªã©ã®æ“
Nnwww 2023/05/03
linux

kernel

filesystem
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perf, ftraceã®ã—ãã¿ - ç¡åˆ†ä¸è¶³
Linuxã®ãƒˆãƒ¬ãƒ¼ã‚µãƒ¼ã§ã‚ã‚‹perfã‚„ftraceã®ãƒ„ãƒ¼ãƒ«ã®ä½¿ã„æ–¹ã«é–¢ã™ã‚‹æƒ…å ±ã¯çµæ§‹ã‚ã‚Šã¾ã™ãŒï¼Œæ§‹é€ ã«é–¢ã—ã¦ã¯ã‚ã¾ã‚Šè¦‹ã¤ã‘ã‚‰ã‚Œãªã‹ã£ãŸãŸã‚ï¼Œã“ã“ã«ç°¡å˜ã«èª¿ã¹ãŸã“ã¨ã‚’ã¾ã¨ã‚ã‚ˆã†ã‹ã¨æ€ã„ã¾ã™ï¼Žï¼ˆãƒ„ãƒ¼ãƒ«ã®ä½¿ã„æ–¹ã®èª¬æ˜Žã¯ã‚ã‚“ã¾ã‚Šã—ãªã„ã§ã™ï¼Žï¼‰ ã“ã®æ–‡ç« ã¯Linux 4.15ã®ã‚½ãƒ¼ã‚¹ã«åŸºã¥ã„ã¦ã„ã¾ã™ï¼Ž å…¨ä½“åƒ ftrace function trace tracepoint (static event) kprobe (dynamic event) ãã®ä»–ã®tracer trace-cmd perf PERF_TYPE_HARDWARE, HW_CACHE, RAW PERF_TYPE_SOFTWARE PERF_TYPE_TRACEPOINT PERF_TYPE_BREAKPOINT USDT (SDT Event) perf-tools perf ftrace straceã¨ã®æ¯”è¼ƒ ãã®ä»– pe
Nnwww 2021/05/18
kernel

tracing

bpf
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Background
The article requires some prerequisite knowledge about Linux kernel memory management subsystem. Recently, while investigating an OOM (out-of-memory) probl em, Twitter engineers found that the slab cache was increasing consistently, but the page cache was decreasing consistently. A closer look showed that the highest consumption of the slab cache was the dentry cache, and the dentry caches were cha
Nnwww 2021/05/17
ã‚«ãƒ¼ãƒãƒ«ãƒ‡ãƒãƒƒã‚°ä½“é¨“è«‡ã€‚æ´»ç”¨ã§ããŸã“ã¨ãªã„ã‘ã©ãªã‚‹ã»ã©ã‚«ãƒ¼ãƒãƒ«ã§ãƒ‡ãƒãƒƒã‚¬èµ°ã‚‰ã›ã¦èª¿æŸ»ã™ã‚‹ã¨ã„ã†ã“ã¨ã‚‚ã‚ã‚‹ã®ã‹...

kernel

linux
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Linux Storage Stack Diagram - Thomas-Krenn-Wiki-en
The Linux Storage Stack Diagram shows the layout of the the Linux storage stack. Downloads Diagram for Linux Kernel 6.11 Currently in development, here is the list of upcoming changes: null_blk: remove the bio based I/O path (Kernel 6.9) Diagram for Linux Kernel 6.9 Linux Storage Stack Diagram v6.9): Linux I/O Stack Diagram v6.2 (20230309): ZIP (includes .drawio and .svg) PDF PNG Changelog: dm-vdo
Nnwww 2021/04/26
linux

kernel

storage
ãƒªãƒ³ã‚¯
How io_uring and eBPF Will Revolutionize Programming in Linux
Things will never be the same again after the dust settles. And yes, Iâ€™m talking about Linux. As I write this, most of the world is in lockdown due to COVID-19. Itâ€™s hard to say how things will look when this is over (it will be over, right?), but one thing is for sure: the world is no longer the same. Itâ€™s a weird feeling: itâ€™s as if we ended 2019 in one planet and started 2020 in another. While
Nnwww 2021/03/02
åŸºæœ¬çš„ã«io_uringã®èª¬æ˜Žã€ãƒ–ãƒãƒƒã‚¯IO -> aio -> io_uringã®æµã‚Œã‚’è¿½ã„ã‹ã‘ã¦ã„ã¦ãƒ¢ãƒãƒ™ãŒåˆ†ã‹ã‚Šã‚„ã™ã„ã€‚

programming

performance

kernel
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linux-sched-history.pdf - Speaker Deck
è¦‹ãˆã¥ã‚‰ã„æ´»å‹•ã®æˆæžœã®ä¼ãˆæ–¹ã¯æ—¥é ƒã‹ã‚‰ã‚ã¡ã‚ƒãã¡ã‚ƒæ‚©ã‚“ã§ã‚‹ã‘ã©ã€å®Ÿéš›ã“ã‚“ãªå–ã‚Šçµ„ã¿ã‚’ã—ãª ãŒã‚‰æ¸©åº¦æ„Ÿã‚’åˆã‚ã›ã«ã„ã£ã¦ã‚‹ã‚ˆ / Conveying Hard-to-See Results
Nnwww 2019/01/19
linux

kernel
ãƒªãƒ³ã‚¯
x86_64 Linuxã§ã®ä»®æƒ³ã‚¢ãƒ‰ãƒ¬ã‚¹/ç‰©ç†ã‚¢ãƒ‰ãƒ¬ã‚¹ - ç¡åˆ†ä¸è¶³
Linux Device Driver Chapter 15ã§ã¯ Linuxã§åˆ©ç”¨ã•ã‚Œã‚‹ã‚¢ãƒ‰ãƒ¬ã‚¹ã‚’ä»¥ä¸‹ã®5ç¨®é¡žã«åˆ†é¡žã—ã¦ã„ã¾ã™ï¼Ž User virtual address Physical address Bus address Kernel logical address Kenerl virtual address User virtual addressã¯ãã®åã®é€šã‚Šãƒ¦ãƒ¼ã‚¶ãƒ—ãƒã‚»ã‚¹ãŒåˆ©ç”¨ã™ã‚‹ä»®æƒ³ã‚¢ãƒ‰ãƒ¬ã‚¹ï¼Œ Physical addressã¯ç‰©ç†ã‚¢ãƒ‰ãƒ¬ã‚¹ï¼ŒBus addressã¯ãƒ‡ãƒã‚¤ã‚¹ãŒä½¿ç”¨ã™ã‚‹ã‚¢ãƒ‰ãƒ¬ã‚¹ ï¼ˆã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ä¾å˜ã§ï¼ŒPhysical addressã¨åŒã˜ã“ã¨ã‚‚å¤šã„ï¼‰ã§ã™ï¼Žæ®‹ã‚Šã® Kernel logical addressã¨Kenel virtual addressã®é•ã„ã‚’ç†è§£ã™ã‚‹ãŸã‚ã«ã¯ï¼Œ Linuxã§ã®ãƒ¡ãƒ¢ãƒªãƒžãƒƒãƒ—ï¼ˆä»®æƒ³ãƒ‰ãƒ¬ã‚¹ã®ä½¿ã„æ–¹ï¼‰ã‚’çŸ¥ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ï¼Žã“ã‚Œã¯ã‚¢ãƒ¼
Nnwww 2018/08/22
kernel

linux

memory
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Linuxã‚«ãƒ¼ãƒãƒ«ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’æ©Ÿèƒ½ã¨ãƒ¬ã‚¤ãƒ¤ãƒ¼ã§åˆ†é¡žã—ã¦è¡¨ç¤ºã—ã¦ãã‚Œã‚‹ã€ŒLinux kernel mapã€
Linuxã®ã‚«ãƒ¼ãƒãƒ«ã¯è†¨å¤§ãªæ•°ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‹ã‚‰æˆã‚Šç«‹ã£ã¦ãŠã‚Šã€ã©ã“ã«ä½•ã®å‡¦ç†ãŒæ›¸ã„ã¦ã‚ã‚‹ã®ã‹ã±ã£ã¨è¦‹å½“ã‚’ã¤ã‘ã‚‹ã®ã«ã¯ã‹ãªã‚Šã‚³ãƒ¼ãƒ‰ã‚’èªã¿è¾¼ã‚€å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ã€ŒInteractive map of Linux kernelã€ã¯ãã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’æ©Ÿèƒ½ã¨ãƒ¬ã‚¤ãƒ¤ãƒ¼ã§åˆ†é¡žã—ã¦è¡¨ç¤ºã—ã¦ãã‚Œã‚‹ã‚µã‚¤ãƒˆã¨ã„ã†ã“ã¨ã§ã€ä½¿ã„å‹æ‰‹ã‚’è©¦ã—ã¦ã¿ã¾ã—ãŸã€‚ Interactive map of Linux kernel http://www.makelinux.net/kernel_map/ ã‚µã‚¤ãƒˆã«ã‚¢ã‚¯ã‚»ã‚¹ã—ã€ãƒãƒ¼ãƒ‰ãŒçµ‚ã‚ã‚‹ã¨ä¸‹ã®ç”»åƒã®ã‚ˆã†ã«6åˆ—6è¡Œã®è¡¨ãŒè¡¨ç¤ºã•ã‚Œã¾ã™ã€‚åˆ—ãŒæ©Ÿèƒ½ã®åˆ†é¡žã‚’è¡¨ã—ã¦ãŠã‚Šã€ã€Œã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã€ã€Œã‚·ã‚¹ãƒ†ãƒ ã€ã€Œå‡¦ç†ã€ã€Œãƒ¡ãƒ¢ãƒªãƒ¼ã€ã€Œã‚¹ãƒˆãƒ¬ãƒ¼ã‚¸ã€ã€Œãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã€ã¨ã„ã†åˆ†é¡žã«ãªã£ã¦ã„ã¾ã™ã€‚è¡Œã¯ãƒ¬ã‚¤ãƒ¤ãƒ¼ã‚’è¡¨ã—ã¦ãŠã‚Šã€ä¸Šã‹ã‚‰ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ãªã©ã®ã€Œãƒ¦ãƒ¼ã‚¶ãƒ¼ã‚¹ãƒšãƒ¼ã‚¹ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã€ã€ã€Œãƒãƒ¼ãƒãƒ£ãƒ«ã€ã€ã€Œãƒ–ãƒªãƒƒã‚¸ã€
Nnwww 2018/03/22
linux

programming

kernel

service
ãƒªãƒ³ã‚¯
Linuxã‚«ãƒ¼ãƒãƒ«ã®æ–°æ©Ÿèƒ½ XDP (eXpress Data Path) ã‚’è§¦ã£ã¦ã¿ã‚‹ - yunazuno.log
å…ˆæ—¥netdev 1.2ã«å‚åŠ ã—ã¦ã¿ãŸã¨ã“ã‚ï¼ŒXDP(eXpress Data Path)ã®è©±é¡Œã§æŒã¡åˆ‡ã‚Šã¨ã„ã£ãŸæ„Ÿã˜ã ã£ãŸï¼Ž ã¨ã„ã†ã‚ã‘ã§ï¼ŒXDPã«ã¤ã„ã¦ä¸€é€šã‚Šèª¿ã¹ã¤ã¤ï¼Œå®Ÿéš›ã«è§¦ã£ã¦ã¿ãŸï¼Ž XDPã¨ã¯ä½•ã‹ï¼Ÿ èª¤è§£ã‚’æã‚Œãšã«ä¸€è¨€ã§è¨€ã†ã¨ï¼Œã€ŒIntel DPDKã®ã‚ˆã†ãªé«˜é€Ÿãƒ‘ã‚±ãƒƒãƒˆå‡¦ç†åŸºç›¤ã‚’Linuxã‚«ãƒ¼ãƒãƒ«è‡ªèº«ãŒç”¨æ„ã—ãŸã‚‚ã®ã€ã§ã‚ã‚‹ã¨ç†è§£ã—ã¦ã„ã‚‹ï¼Žã“ã®ã‚¹ãƒ©ã‚¤ãƒ‰ã§ã¯ A programmable, high performance, specialized application, packet processor in the Linux networking data path ã¨è¨€ã£ã¦ã„ã‚‹ï¼Ž DPDKã¯ãƒ¦ãƒ¼ã‚¶ãƒ©ãƒ³ãƒ‰ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãŒNICã‚’ç›´æŽ¥å©ã(=ã‚«ãƒ¼ãƒãƒ«ã®ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚¹ã‚¿ãƒƒã‚¯ã‚’ãƒã‚¤ãƒ‘ã‚¹ã™ã‚‹)ã“ã¨ã§é«˜é€Ÿå‡¦ç†ã‚’å®Ÿç¾ã—ã¦ã„ã‚‹ï¼Žä¸€æ–¹XDPã¯ï¼Œã‚«ãƒ¼ãƒãƒ«å†…ã®æœ€ã‚‚NICãƒ‰ãƒ©ã‚¤ãƒã«è¿‘ã„å ´æ‰€ã§ãƒ•ãƒƒ
Nnwww 2017/12/06
Linux

kernel

network

xdp
ãƒªãƒ³ã‚¯
ç‰¹å®šæ¡ä»¶ä¸‹ã®clone(2)ã‚’4å€é€Ÿãã™ã‚‹ - äººé–“ã¨ã‚¦ã‚§ãƒ–ã®æœªæ¥
ã¨ã‚ã‚‹ã‚µãƒ¼ãƒã§å¦™ã«ã‚·ã‚¹ãƒ†ãƒ CPUã®ä½¿ç”¨çŽ‡ãŒé«˜ã„ç¾è±¡ãŒç½®ãã¦ãŠã‚Šã¾ã—ãŸã€‚ ãã“ã§ã€ã¾ãšã¯ã–ã£ãã‚Šã¨perf topã§ãƒ—ãƒãƒ•ã‚¡ã‚¤ãƒ«ã‚’ã¨ã£ã¦ã¿ã‚‹ã¨ã€ä»¥ä¸‹ã®ã‚ˆã†ã«ãªã£ã¦ã„ã¾ã—ãŸã€‚ 22.38% [kernel] [k] copy_pte_range 18.44% [kernel] [k] zap_pte_range 11.13% [kernel] [k] change_pte_range 3.58% [kernel] [k] page_fault 3.32% [kernel] [k] page_remove_rmap ã¾ãŸã€å„ãƒ—ãƒã‚»ã‚¹ã®straceã‚’çœºã‚ã¦ã„ã‚‹ã¨ã€cloneã§0.05ç§’ã¨ã‹ãªã‚Šæ™‚é–“ãŒã‹ã‹ã£ã¦ã„ã‚‹ã‚ˆã†ã§ã™ã€‚ã“ã‚Œã ã¨å˜ç´”è¨ˆç®—ã§1ã‚³ã‚¢ã§ç§’é–“20å›žã®cloneã§ã‚³ã‚¢100%å æœ‰ã—ã¦ã—ã¾ã†ç¨‹åº¦ã®éžå¸¸ã«ä½Žé€Ÿãªå‡¦ç†ã—ã‹ã§ããªã„ã“ã¨ã«ãªã‚Šã¾ã™ã€‚ sudo strace -T -o/dev/stdo
Nnwww 2016/07/14
kernel

programming

strace

performance
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process-book
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Nnwww 2016/02/03
UNIX

process

linux

kernel
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