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nobyuki id:nobyuki

kernelã«é–¢ã™ã‚‹nobyukiã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (65)

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listen backlog ã€3.6ã€‘ - Linuxã‚«ãƒ¼ãƒãƒ«ãƒ¡ãƒ¢
(*1) backlog(512)ã¯tcp_max_syn_backlog(400)ã‚ˆã‚Šå¤§ãã„ã®ã§ã€400ã‚’åˆ‡ã‚Šä¸Šã’ãŸ512ãŒsyn backlogã®ã‚µã‚¤ã‚ºã«ãªã‚‹ã€‚ syn backlogã®ã‚µã‚¤ã‚ºã‚’å¤§ããã—ã‚ˆã†ã¨ã™ã‚‹ã«ã¯ã€ä»¥ä¸‹ã®ç‚¹ã«æ³¨æ„ã™ã‚‹ã€‚ (a) net.ipv4.tcp_max_syn_backlogã‚’å¤§ããã™ã‚‹ (b) listen()ã§æŒ‡å®šã™ã‚‹backlogå€¤ã‚’å¤§ããã™ã‚‹(apacheãªã‚‰ListenBackLogãƒ‡ã‚£ãƒ¬ã‚¯ãƒ†ã‚£ãƒ–ã§æŒ‡å®šã§ãã‚‹) (c) backlogã®å€¤è‡ªä½“ã¯net.core.somaxconnã«åˆ‡ã‚Šè©°ã‚ã‚‰ã‚Œã‚‹ãŸã‚ã€net.core.somaxconnã®æ–¹ã‚‚å¤§ããã—ã¦ãŠãã€‚ syn backlogã®æœ€å¤§ã‚µã‚¤ã‚ºã¯backlogã‚µã‚¤ã‚ºã«åŸºã¥ã„ã¦æ±ºã¾ã‚‹ãŸã‚ã€net.ipv4.tcp_max_syn_backlogã‚’å¤§ããã™ã‚‹ã ã‘ã§ãªãã€backlogè‡ªä½“ãŒå¤§ãããªã‚‹ã‚ˆã†
nobyuki 2016/12/13
kernel

network
ãƒªãƒ³ã‚¯
statãƒ•ã‚¡ãƒŸãƒªï¼ã®ãƒ¡ãƒ¢ã¨ã€ã‚«ãƒ¼ãƒãƒ«ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚° - Qiita
èª¿æŸ»ã‚’ã™ã‚‹ã¨ãã«ä½¿ã†ãŒã€æ¯Žå›žå¿˜ã‚Œã¦ã—ã¾ã†ã®ã§è‡ªåˆ†ç”¨ã«ãƒ¡ãƒ¢ statãƒ•ã‚¡ãƒŸãƒªãƒ¼ã¾ã¨ã‚ dstat ç¾Žã—ã„ï¼ã€€ç›®ã§è¦‹ã‚‹ãªã‚‰ã“ã‚Œã€‚ æœ€ã‚‚å½¹ã«ç«‹ã¤å‚è€ƒã‚µã‚¤ãƒˆï¼šhttp://qiita.com/harukasan/it ems/b18e484662943d834901 vmstat ãƒ¡ãƒ¢ãƒªã‚„CPUã‚’è¦‹ã‚‹æ™‚ã«ä½¿ã†ã€‚ iostat ãƒ‡ã‚£ã‚¹ã‚¯IOã‚’è¦‹ã‚‹ã¨ãã«ä½¿ã†ã€‚ netstat ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®çŠ¶æ…‹ã‚’è¦‹ã‚‹ã¨ãã«ä½¿ã†ã€‚ ã‚«ãƒ¼ãƒãƒ«ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ã¨KVSè¨å®š net.core.somaxconn TCPã®max connectionæ•°ã€‚ å‚è€ƒã‚µã‚¤ãƒˆï¼šhttp://d.hatena.ne.jp/tetsuyai/20111220/1324466655 ä¾‹ãˆã°memcacheã‚„Redisç‰ã®KVSã‚’ä½¿ã†ã¨ãã¯ã€memcachedã®tcp_backlogã‚„ã€Redisã®maxclientsã®æ•°å€¤ä»¥ä¸Šã«ã‚ã’ãŸã»ã†ãŒã„ã„ã€‚
nobyuki 2016/11/28
Linux

network

kernel
ãƒªãƒ³ã‚¯
net.core.somaxconnã«ã¤ã„ã¦èª¿ã¹ã¦ã¿ãŸ - ç¥ˆã‚Œã€ãã—ã¦åƒã‘ ï½ž Ora et labora
æ¦‚è¦ â†“ memcachedã®tcp_backlogã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã¯1024ã§ã€stats settingsã«ã‚‚1024ã¨è¡¨ç¤ºã•ã‚Œã¦ã„ã‚‹ã®ã§ã™ãŒã€ stats settings ... STAT tcp_backlog 1024 ... ENDâ†“ net.core.somaxconnãŒãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã®ã¾ã¾ã ã¨128ã«åˆ‡ã‚Šè©°ã‚ã‚‰ã‚Œã¦ã—ã¾ã„ã€ # cat /proc/sys/net/core/somaxconn 128è² è·ãŒé«˜ã„ã‚µãƒ¼ãƒãƒ¼ã§ã¯æŽ¥ç¶šè¦æ±‚ã‚’å–ã‚Šã“ã¼ã—ã¦ã—ã¾ã†ã“ã¨ãŒã‚ã‚‹ãã†ã§ã™ã€‚ ã“ã®net.core.somaxconnã€Memcacheã‚„MySQLãªã©ã€é«˜è² è·æ™‚ã«å¤šãã®æŽ¥ç¶šè¦æ±‚ã‚’å—ã‘ä»˜ã‘ã‚‹ã‚µãƒ¼ãƒãƒ¼ã§ã¯ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°ãŒå¿…è¦ãªã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã®ã‚ˆã†ã§ã™ã€‚ã„ã£ãŸã„ã©ã†ã„ã†å€¤ãªã®ã‹ã€èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚ net.core.somaxconnã¨ã¯ TCPã‚½ã‚±ãƒƒãƒˆã¯listen()é–¢æ•°ã®ç¬¬äºŒå¼•æ•° ba
nobyuki 2016/11/25
Linux

kernel

network
ãƒªãƒ³ã‚¯
Dirty COW (CVE-2016-5195)
Dirty COW (CVE-2016-5195) is a privilege escalation vulnerability in the Linux Kernel View Exploit Details What is the CVE-2016-5195? CVE-2016-5195 is the official reference to this bug. CVE (Common Vulnerabilities and Exposures) is the Standard for Information Security Vulnerability Names maintained by MITRE. Why is it called the Dirty COW bug? "A race condition was found in the way the Linux ker
nobyuki 2016/10/27
security

kernel

Linux
ãƒªãƒ³ã‚¯
Linuxã§ã‚¯ãƒ©ãƒƒã‚·ãƒ¥ãƒ€ãƒ³ãƒ—ã‚’æŽ¡å–(5) ã€œ nmi_watchdogã¨ã®ä½µç”¨ ã€œ : DSASé–‹ç™ºè€…ã®éƒ¨å±‹
ã¨ã‚Šã‚ãˆãšã€ã“ã“ã¾ã§ã®ä»•çµ„ã¿ã§ã€Œã‚«ãƒ¼ãƒãƒ«ãƒ‘ãƒ‹ãƒƒã‚¯ãŒç™ºç”Ÿã€ã—ãŸéš›ã®ã‚¯ãƒ©ãƒƒã‚·ãƒ¥ãƒ€ãƒ³ãƒ—ã‚’æŽ¡å–ã™ã‚‹ã“ã¨ã¯ã§ããã†ã§ã™ã€‚ã—ã‹ã—ã€å®Ÿéš›ã«ãƒˆãƒ©ãƒ–ãƒ«ãŒç™ºç”Ÿã™ã‚‹çŠ¶æ³ã§ã¯ç¶ºéº—ã«ãƒ‘ãƒ‹ãƒƒã‚¯ã—ã¦ãã‚Œã‚‹ã“ã¨ã¯å¸Œã§ã€å¤§æŠµã®å ´åˆã¯ã©ã†ã«ã‚‚ã“ã†ã«ã‚‚èº«å‹•ããŒã¨ã‚Œãªããªã£ã¦ã—ã¾ã„ãŒã¡ãªã‚‚ã®ã§ã™ã€‚ping ãŒé€šã‚‰ãªããªã‚Šã‚³ãƒ³ã‚½ãƒ¼ãƒ«ã§ã®åˆ¶å¾¡ãŒä¸èƒ½ã«ãªã£ã¦ã¿ãŸã‚Šãƒ»ãƒ»ãƒ» ã€Œè·¯åœ°è£ ã‚½ãƒ¼ã‚¹è§£èªç ”ç©¶æ‰€ã€ã®ã€Œæœ€å¼·ã®å‰²ã‚Šè¾¼ã¿ã€ã§ nmi_watchdog ã¨ã„ã†ã‚‚ã®ãŒç´¹ä»‹ã•ã‚Œã¦ã„ã¾ã—ãŸã€‚ã€Œå®šæœŸçš„ã« NMI ã‚’ç™ºè¡Œã•ã›ã¦è‡ªåˆ†è‡ªèº«ã®æ»æ´»ç›£è¦–ã™ã‚‹ã§ã™ã‹ã€ã¸ãˆã‡ã€œã€ã¨æ€ã„ã¤ã¤å®Ÿéš›ã«ã‚„ã£ã¦ã¿ã¾ã—ãŸã€‚ ã—ã‹ã—ã€å•é¡Œã¯ã©ã†ã‚„ã£ã¦å‹•ä½œç¢ºèªã™ã‚‹ã‹ã§ã™ã‚ˆãã€‚ ã ã‚ã‚‚ã¨ã§ã‚µãƒ¼ãƒã‚’éŽè² è·çŠ¶æ…‹ã«è¿½ã„è¾¼ã‚“ã§ãƒãƒ¼ãƒ‰ã‚¢ãƒ™ãƒ¬ãƒ¼ã‚¸ã‚’350ãã‚‰ã„ã¾ã§ä¸Šã’ã¦ã¿ãŸã‚“ã§ã™ãŒã€ã•ã™ãŒã«å‰²ã‚Šè¾¼ã¿å‡¦ç†ã¯ã¡ã‚ƒã‚“ã¨å‹•ã„ã¦ã‚‹ã‚ˆã†ã§ãªã‹ãªã‹è½ã¡ã¦ãã‚Œã¾ã›ã‚“ã€‚ï¼ˆé€†ã«éŽè² è·ãªã ã‘ã§ nmi_watchd
nobyuki 2016/04/20
NMI watchdog ã®å‹•ä½œç¢ºèªæ–¹æ³•

kernel

Tips
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JF: Linux Kernel 2.6 Documentation: nmi_watchdog.txt
NMI ã‚¦ã‚©ãƒƒãƒãƒ‰ãƒƒã‚° [ãƒ—ãƒ¬ã‚¤ãƒ³ãƒ†ã‚ã‚¹ãƒˆç‰ˆ] åŽŸè‘—ä½œè€…: Ingo Molnar <mingo@redhat.com> ç¿»è¨³è€…: é‡Žæœ¬ æµ©ä¸€ <hng(a)ps.ksky.ne.jp> å·å´Ž è²´å½¦ <takahiko(a)hakubi.co.jp> ãƒãƒ¼ã‚¸ãƒ§ãƒ³: 2.6.5 ç¿»è¨³æ—¥æ™‚: 2004/05/04 [NMI ã‚¦ã‚©ãƒƒãƒãƒ‰ãƒƒã‚°ã¯ x86 ãŠã‚ˆã³ x86-64 ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã§ã®ã¿ä½¿ç”¨ã§ãã¾ã™] ã‚ãªãŸã®ã‚·ã‚¹ãƒ†ãƒ ã¯äºˆæœŸã›ãšã«ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã—ã¾ã™ã‹ï¼Ÿ ã‚ãƒ¼ãƒœãƒ¼ãƒ‰ã‹ã‚‰ã®å…¥åŠ›ã« å¿œç”ã—ãªã„ã€ã‚¤ãƒ©ã‚¤ãƒ©ã™ã‚‹ã‚ˆã†ãªå®Œå…¨ãªãƒãƒ¼ãƒ‰ãƒ»ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã§ã™ã‹ï¼Ÿ ã“ã®ã‚ˆã†ãª ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—ã®ãƒ‡ãƒãƒƒã‚°æ”¯æ´ã‚’å—ã‘ãŸã„ã§ã™ã‹ï¼Ÿ å…¨ã¦ãŒã€Œã¯ã„ã€ãªã‚‰ã€ã“ã®æ–‡æ›¸ã¯ ãã£ã¨ã€ã‚ãªãŸã®ãŸã‚ã®ã‚‚ã®ã§ã™ã€‚ å¤šãã® x86/x86-64 ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ã«ã¯ã€'ã‚¦ã‚©ãƒƒãƒãƒ‰ãƒƒã‚° NMI å‰²è¾¼ã¿' ã®ç”Ÿæˆã‚’ æœ‰åŠ¹ã«ã™ã‚‹æ©Ÿèƒ½ãŒã‚ã‚Šã¾ã™ (NMI
nobyuki 2016/04/18
Linux

kernel
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The Linux Kernel: ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ
æ¬¡ã®ãƒšãƒ¼ã‚¸ å‰ã®ãƒšãƒ¼ã‚¸ ç›®æ¬¡ã¸ 10. ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã“ã®ç« ã§ã¯ã€Linux ã‚«ãƒ¼ãƒãƒ«ãŒã‚µãƒãƒ¼ãƒˆã™ã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ å†…ã§ã®ãƒ•ã‚¡ã‚¤ãƒ«ç®¡ç† ã®æ–¹æ³•ã‚„ã€ä»®æƒ³ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®ä»•çµ„ã¿ã«ã¤ã„ã¦è§£èª¬ã™ã‚‹ã€‚ã¾ãŸã€Linux ã‚«ãƒ¼ãƒãƒ«ã® å®Ÿ(real)ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ãŒã©ã®ã‚ˆã†ã«ã‚µãƒãƒ¼ãƒˆã•ã‚Œã¦ã„ã‚‹ã®ã‹ã«ã¤ã„ã¦ã‚‚èª¬æ˜Žã™ã‚‹ã€‚ Linux ã®æœ€ã‚‚é‡è¦ãªç‰¹å¾´ã®ã²ã¨ã¤ã«ã€ã‚µãƒãƒ¼ãƒˆã™ã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®è±Šå¯Œã•ãŒã‚ ã‚‹ã€‚ã“ã®ã“ã¨ãŒã€Linux ã‚’éžå¸¸ã«æŸ”è»Ÿãªã‚‚ã®ã«ã—ã€ä»–ã®å¤šãã®ã‚ªãƒšãƒ¬ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚·ã‚¹ ãƒ†ãƒ ã¨ã®å…±å˜ã‚’å¯èƒ½ã«ã—ã¦ã„ã‚‹ã€‚æ›¸ãè¾¼ã¿ã«é–¢ã—ã¦ã€Linux ã¯ 15 ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚’ã‚µãƒãƒ¼ãƒˆã—ã¦ã„ã‚‹ã€‚ãã‚Œã‚‰ã¯ã€ext, ext2, xia, minix, umsdos, msdos, vfat, proc, smb, ncp, iso9660, sysv, hpfs, affs, ãã‚Œã« ufs ã§ã‚ã‚Šã€ ãŠ
nobyuki 2015/08/31
Linux

kernel

*reference
ãƒªãƒ³ã‚¯
bcache - Wikipedia
bcache (abbreviated from block cache) is a cache mechanism in the Linux kernel's block layer, which is used for accessing secondary storage devices. It allows one or more fast storage devices, such as flash-based solid-state drives (SSDs), to act as a cache for one or more slower storage devices, such as hard disk drives (HDDs); this effectively creates hybrid volumes and provides performance impr
nobyuki 2015/07/16
Linux

kernel
ãƒªãƒ³ã‚¯
XNU - Wikipedia
XNUã®åŸºç¤Žã§ã‚ã‚‹Machã¯ã‚·ãƒ³ãƒ—ãƒ«ãªãƒžã‚¤ã‚¯ãƒã‚«ãƒ¼ãƒãƒ«ã§ã‚ã‚Šã€OSã®ã‚³ã‚¢ã‚’åˆ†å‰²ã•ã‚ŒãŸæŸ”è»Ÿãªãƒ—ãƒã‚»ã‚¹ã¨ã—ã¦å®Ÿè¡Œã™ã‚‹ã“ã¨ãŒã§ãã‚‹ï¼ˆMachã‚³ã‚¢ã®ä¸Šã§ã„ãã¤ã‹ã®OSã‚’å¹³è¡Œã—ã¦å®Ÿè¡Œã§ãã‚‹ï¼‰ã€‚ã—ã‹ã—ã€ã“ã‚Œã¯ã‚«ãƒ¼ãƒãƒ«/ãƒ¦ãƒ¼ã‚¶ãƒ¢ãƒ¼ãƒ‰ã®åˆ‡ã‚Šæ›¿ãˆã«æ™‚é–“ã‚’æ¶ˆè²»ã—ã€ã¾ãŸãƒžã‚¤ã‚¯ãƒã‚«ãƒ¼ãƒãƒ«ã®ã‚¢ãƒ‰ãƒ¬ã‚¹ç©ºé–“ã¨ãƒ‡ãƒ¼ãƒ¢ãƒ³ã¨ã®ã‚ã„ã ã§è¡Œã‚ã‚Œã‚‹ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã®ãƒžãƒƒãƒ”ãƒ³ã‚°ã‚„ã‚³ãƒ”ãƒ¼ã«ã‚ˆã£ã¦ã‚ªãƒ¼ãƒãƒ¼ãƒ˜ãƒƒãƒ‰ã‚’ç”Ÿã˜ã‚‹ã“ã¨ã‹ã‚‰ã€ã—ã°ã—ã°ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãŒä½Žä¸‹ã—ã¦ã—ã¾ã†ã€‚macOSã§ã¯åŠ¹çŽ‡åŒ–ã®ãŸã‚ã«ã€BSDã®æ©Ÿèƒ½ã¯Machã®ã‚³ã‚¢ã®ä¸ã«çµ„ã¿è¾¼ã¾ã‚ŒãŸã€‚ãã®çµæžœã€Machã¨å¤å…¸çš„ãªBSDã‚«ãƒ¼ãƒãƒ«ä¸¡æ–¹ã®åˆ©ç‚¹ã¨æ¬ ç‚¹ã‚’ä½µã›ã‚‚ã¤ã‚‚ã®ã¨ãªã£ãŸã€‚ Machã¯ã€ã‚«ãƒ¼ãƒãƒ«ã‚¹ãƒ¬ãƒƒãƒ‰ã€ãƒ—ãƒã‚»ã‚¹ç®¡ç†ã€ãƒ—ãƒªã‚¨ãƒ³ãƒ—ãƒ†ã‚£ãƒ–ãƒ»ãƒžãƒ«ãƒã‚¿ã‚¹ã‚¯ã€ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ãƒ‘ãƒƒã‚·ãƒ³ã‚°ï¼ˆãƒ—ãƒã‚»ã‚¹é–“é€šä¿¡ï¼‰ã€ãƒ¡ãƒ¢ãƒªä¿è·ã€ä»®æƒ³è¨˜æ†¶ã€ã‚½ãƒ•ãƒˆãƒªã‚¢ãƒ«ã‚¿ã‚¤ãƒ å‡¦ç†ã®ã‚µãƒãƒ¼ãƒˆã€ã‚«ãƒ¼ãƒãƒ«ãƒ‡ãƒãƒƒã‚°ã®ã‚µãƒãƒ¼ãƒˆã€ã‚³ãƒ³ã‚½ãƒ¼ãƒ«I/Oã‚’æ
nobyuki 2015/05/29
kernel

Mac
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ã‚«ãƒ¼ãƒãƒ« - Wikipedia
å‡ºå…¸ã¯åˆ—æŒ™ã™ã‚‹ã ã‘ã§ãªãã€è„šæ³¨ãªã©ã‚’ç”¨ã„ã¦ã©ã®è¨˜è¿°ã®æƒ…å ±æºã§ã‚ã‚‹ã‹ã‚’æ˜Žè¨˜ã—ã¦ãã ã•ã„ã€‚ è¨˜äº‹ã®ä¿¡é ¼æ€§å‘ä¸Šã«ã”å”åŠ›ã‚’ãŠé¡˜ã„ã„ãŸã—ã¾ã™ã€‚ï¼ˆ2021å¹´9æœˆï¼‰ ã“ã®é …ç›®ã§ã¯ã€ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ç”¨èªžã«ã¤ã„ã¦èª¬æ˜Žã—ã¦ã„ã¾ã™ã€‚ è»éšŠã®éšŽç´šã«ã¤ã„ã¦ã¯ã€Œå¤§ä½ã€ã‚’ã”è¦§ãã ã•ã„ã€‚ ã‚±ãƒ³ã‚¿ãƒƒã‚ãƒ¼ãƒ»ãƒ•ãƒ©ã‚¤ãƒ‰ãƒã‚ãƒ³ç¤¾ã®å‰µè¨è€…ã«ã¤ã„ã¦ã¯ã€Œã‚«ãƒ¼ãƒãƒ«ãƒ»ã‚µãƒ³ãƒ€ãƒ¼ã‚¹ã€ã‚’ã”è¦§ãã ã•ã„ã€‚ ãã®ä»–ã®ç”¨æ³•ã«ã¤ã„ã¦ã¯ã€Œã‚«ãƒ¼ãƒãƒ« (æ›–æ˜§ã•å›žé¿)ã€ã‚’ã”è¦§ãã ã•ã„ã€‚ ã‚«ãƒ¼ãƒãƒ«ã¯ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã¨ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ã®ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ã‚’çµã³ä»˜ã‘ã‚‹ã€‚ ã‚«ãƒ¼ãƒãƒ«ï¼ˆè‹±: kernelï¼‰ã¯ã€éšŽå±¤åž‹ã«è¨è¨ˆã•ã‚ŒãŸã‚ªãƒšãƒ¬ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ (OS) ã®ä¸æ ¸ã¨ãªã‚‹éƒ¨åˆ†ã§ã€ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¨ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ã®æž¶ã‘æ©‹ã§ã‚ã‚‹ã€‚å…·ä½“çš„ã«ã¯ã€ã‚·ã‚¹ãƒ†ãƒ ã®ãƒªã‚½ãƒ¼ã‚¹ã‚„ã€ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢ã¨ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã®é€£æºã‚’ç®¡ç†ã™ã‚‹[1]ã€‚ãã®ã»ã‹ã€é€šä¿¡åˆ¶å¾¡ã‚’è¡Œã†ã“ã¨ãŒå¤šã„ã€‚ ã‚ªãƒšãƒ¬ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚·ã‚¹ãƒ†ãƒ ã®åŸºæœ¬
nobyuki 2015/05/29
kernel
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ãƒãƒ¼ãƒ€ãƒ–ãƒ«ãƒ»ã‚«ãƒ¼ãƒãƒ«ãƒ»ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ« - Wikipedia
Linuxã«ãŠã‘ã‚‹ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã¯ã‚·ã‚¹ãƒ†ãƒ ãƒ¬ãƒ™ãƒ«ã®æ©Ÿèƒ½ã‚’å®Ÿè¡Œã™ã‚‹ãƒ«ãƒ¼ãƒãƒ³ã®é›†ã¾ã‚Šã§ã‚ã‚‹ã€‚ãã‚Œã‚‰ã¯ç‰¹å®šã®ãƒ‡ãƒã‚¤ã‚¹åˆ©ç”¨ã®ãŸã‚ã®ãƒ‡ãƒã‚¤ã‚¹ãƒ‰ãƒ©ã‚¤ãƒã‚„ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã€é€šä¿¡ãƒ—ãƒãƒˆã‚³ãƒ«ã®ãŸã‚ã®ã‚·ã‚¹ãƒ†ãƒ ãƒ«ãƒ¼ãƒãƒ³ã‚’å«ã‚€ã€ã‚«ãƒ¼ãƒãƒ«ã«ãƒªãƒ³ã‚¯ã•ã‚Œã¦ã„ãªã„ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã§ã‚ã‚Šã€ã‚·ã‚¹ãƒ†ãƒ ã‚’å†èµ·å‹•ã›ãšãã‚Œã‚‰ã‚’åˆ©ç”¨å¯èƒ½ã«ã™ã‚‹ã€‚å ´åˆã«ã‚ˆã£ã¦ã¯ã€å®Ÿéš›ã«ãƒ‡ãƒã‚¤ã‚¹ã‚’åˆ©ç”¨ã™ã‚‹å ´åˆã€MAKEDEV[1]ã‚’ä½¿ç”¨ã—ã¦é™çš„ã«ãƒ‡ãƒã‚¤ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ä½œæˆã™ã‚‹ã€ã‚‚ã—ãã¯udevã‚’åˆ©ç”¨ã—ã¦ãƒ›ãƒƒãƒˆãƒ—ãƒ©ã‚°ã‚’è¡Œã„å‹•çš„ã«ãƒ‡ãƒã‚¤ã‚¹ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ç”Ÿæˆã™ã‚‹å¿…è¦ãŒã‚ã‚‹ã€‚ Linuxã®ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ç¾¤ã¯/lib/modulesãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã«ãƒãƒ¼ã‚¸ãƒ§ãƒ³æ¯Žã«ç½®ã‹ã‚Œã€ãƒãƒ¼ã‚¸ãƒ§ãƒ³2.6ä»¥é™ã¯æ‹¡å¼µå .ko ("kernel object"ã®æ„)ãŒä»˜ã•ã‚Œã¦ã„ã‚‹[2]ã€‚ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã¯ã‚«ãƒ¼ãƒãƒ«ã«æ—¢ã«å«ã¾ã‚Œã¦ã„ã‚‹æœªè§£æ±ºã‚·ãƒ³ãƒœãƒ«ã‚’æŒã¡ã€å†é…ç½®å¯èƒ½ãªELFã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã§ã‚ã‚‹ã€‚ã“ã‚Œã¯ã‚«ãƒ¼ãƒãƒ«ã‚’ä¸€
nobyuki 2015/05/29
OS

kernel

Mac

UNIX

Windows
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LKML: Ima Sheep: Linux 4.0 released
So I decided to release 4.0 as per the normal schedule, because there really weren't any known issues, and while I'll be traveling during the end of the upcoming week due to a college visit, I'm hoping that won't affect the merge window very much. We'll see. Linux 4.0 was a pretty small release both in linux-next and in final size, although obviously "small" is all relative. It's still over 10k no
nobyuki 2015/04/13
Linux

kernel
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Linux Kernel 4.0 Released, This Is What's New
nobyuki 2015/04/13
Linux

kernel
ãƒªãƒ³ã‚¯
27492 â€“ BUG: unable to handle kernel NULL pointer dereference, on high filesystem io
nobyuki 2014/03/10
kernel
ãƒªãƒ³ã‚¯
Gentoo Forums :: View topic - kernel vmalloc failed copying files
nobyuki 2014/03/10
xfs vmap errors under kernel 2.6.36-r5 since kernel 2.6.34

Linux

kernel
ãƒªãƒ³ã‚¯
åŒæ™‚ã«write(2)ã™ã‚‹ã¨æ··ã–ã‚‹ã‹ã©ã†ã‹ - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´
Linux ã®ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã§ã‚ã‚‹ write(2) ã® ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆã‚’èªã‚€ã¨ Atomic/non-atomic: A write is atomic if the whole amount written in one operation is not interleaved with data from any other process. This is useful when there are multiple writers sending data to a single reader. Applications need to know how large a write request can be expected to be performed atomically. This maximum is called {PIPE_BUF}. This volume of
nobyuki 2014/02/04
kernel

filesystem
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Emacsã„ã˜ã‚ã®ç¾å ´
Vimé™£å–¶ã¨ã—ã¦Emacsã‚’å®Œè†šãªãã¾ã§ã«è™ã‚ã¾ã™ã€‚ â€»ç™ºè¡¨è€…ã¯åˆ¥ã«EmacsãŒã‚¯ã‚½ã ã¨ã¯å¾®å¡µã‚‚æ€ã£ã¦ã„ã¾ã›ã‚“
nobyuki 2013/08/21
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emacs

vim

kernel

*neta
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Linux kernel 3.9 ã®æ–°æ©Ÿèƒ½ SO_REUSEPORT ã‚’è©¦ã—ã¦ã¿ã‚‹ - nigakyã®ãƒ–ãƒã‚°
Linux kernel 3.9 ã®ãƒžãƒ¼ã‚¸ã‚¦ã‚£ãƒ³ãƒ‰ã‚¦ã§ã¯ SO_REUSEPORT ã¨ã„ã†ã‚½ã‚±ãƒƒãƒˆã‚ªãƒ—ã‚·ãƒ§ãƒ³ãŒãƒžãƒ¼ã‚¸ã•ã‚Œã¾ã—ãŸã€‚ Merge branch 'soreuseport' Â· c617f39 Â· torvalds/linux Â· GitHub ã“ã‚Œã¯åŒä¸€ãƒãƒ¼ãƒˆã«è¤‡æ•°ã®ãƒªã‚¹ãƒŠãƒ¼ï¼ˆlisten ã‚½ã‚±ãƒƒãƒˆï¼‰ãŒ bind ã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ã¨ã„ã†ã‚‚ã®ã§ã€Webã‚µãƒ¼ãƒãªã©å˜ä¸€ã®ãƒãƒ¼ãƒˆã«å¤šãã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ãŒæ¥ã‚‹ã‚ˆã†ãªãƒ¯ãƒ¼ã‚¯ãƒãƒ¼ãƒ‰ã§ã€è¤‡æ•°ãƒ—ãƒã‚»ã‚¹ã§ã†ã¾ãè² è·åˆ†æ•£ãŒã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ãã†ã§ã™ã€‚ ï¼ˆã“ã‚Œã¾ã§ã ã¨ä¸€äººãŒaccept()ã—ã¦ãã‚Œãžã‚Œã® worker ã«æ¸¡ã™ã¨ã„ã†ã‚ˆã†ãªãƒ¢ãƒ‡ãƒ«ãŒã‚ã‚Šã¾ã—ãŸãŒã€ã“ã‚Œã§ã¯ accept() ã™ã‚‹éƒ¨åˆ†ãŒãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã«ãªã£ã¦ã—ã¾ã„ãŒã¡ã§ã—ãŸã€‚ï¼‰ BSDã§ã¯å…ƒã€… SO_REUSEPORT ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã¯ã‚ã£ãŸã‚ˆã†ã§ã™ãŒã€ãƒžãƒ«ãƒã‚ãƒ£ã‚¹ãƒˆé€šä¿¡ã§ä½¿ã†ã‚‚ã®ã®ã‚ˆã†ã§ã™ã€‚Linux
nobyuki 2013/05/16
Linux

kernel
ãƒªãƒ³ã‚¯
ã„ã¾ã™ãå®Ÿè·µ! Linuxã‚·ã‚¹ãƒ†ãƒ ç®¡ç†
ã€Œã„ã¾ã™ãå®Ÿè·µ! Linux ã‚·ã‚¹ãƒ†ãƒ ç®¡ç†ã€ã¯ã“ã¡ã‚‰ã§ã™ã€‚ ãƒ¡ãƒ«ãƒžã‚¬ã®è§£é™¤ã€ãƒãƒƒã‚¯ãƒŠãƒ³ãƒãƒ¼ãªã©ã‚‚ã€ä»¥ä¸‹ã‹ã‚‰ã©ã†ãžã€‚ https://www.usupi.org/sysad/ (ã¾ãã¾ã ID:149633) ãã®ä»–ã€ä½œè€…ã«é–¢ã™ã‚‹ãƒšãƒ¼ã‚¸ã¯ã€æ¦‚ãä»¥ä¸‹ã«ã”ã–ã„ã¾ã™ã€‚ https://www.usupi.org/kuri/ (ã¾ãã¾ã ID:126454) http://usupi.seesaa.net/ (æ —æ—¥è¨˜ãƒ–ãƒã‚°) https://twitter.com/kuriking/ (twitter) https://facebook.com/kuriking3 (facebook) https://jp.pinterest.com/kuriking/pinterest) https://www.instagram.com/kuri_king_/ (instagram) [ãƒãƒƒã‚¯ãƒŠãƒ³ãƒãƒ¼ã®ãƒˆãƒƒãƒ—ã¸
nobyuki 2013/03/15
cgroups

kernel

ops
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Charming Python: Functional programming in Python, Part 3
IBM Developer is your one-stop location for getting hands-on training and learning in-demand skills on relevant techno logies such as generative AI, data science, AI, and open source.
nobyuki 2013/03/13
Linux

kernel
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