{"id":55519,"date":"2020-01-22T00:00:00","date_gmt":"2020-01-21T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard"},"modified":"2020-02-18T14:03:38","modified_gmt":"2020-02-18T11:03:38","slug":"dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard","title":{"rendered":"F\u00f6r Btrfs presenterades en asynkron implementering av DISCARD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>F\u00f6r filsystemet btrfs <noindex><a rel=\"nofollow\" href=\"https:\/\/git.kernel.org\/pub\/scm\/linux\/kernel\/git\/kdave\/linux.git\/commit\/?h=for-next&#038;id=717b684118e3c3c73e4beeea8535b3bb90c33ebb\">presenterades<\/a><\/noindex> asynkron implementering av DISCARD-operationen (markering av frigjorda block som inte l\u00e4ngre beh\u00f6ver lagras fysiskt), implementerad av ingenj\u00f6rerna p\u00e5 Facebook.<\/p>\n<p>Problemet \u00e4r att i den ursprungliga implementationen utf\u00f6rs DISCARD synkront med andra operationer, vilket i vissa fall leder till prestandaproblem, eftersom man m\u00e5ste v\u00e4nta p\u00e5 att motsvarande kommandon slutf\u00f6rs av lagringsmedierna, vilket kr\u00e4ver extra tid. Detta kan bli ett problem om DISCARD-implementationen p\u00e5 lagringsmediet fungerar l\u00e5ngsamt. <\/p>\n<p>Vid asynkron implementering beh\u00f6ver man inte v\u00e4nta p\u00e5 att DISCARD ska slutf\u00f6ras av lagringsmediet under den vanliga driften av FS, vilket l\u00f6ser problemet och g\u00f6r denna operation till en bakgrundsuppgift. Den presenterade implementeringen utf\u00f6r ocks\u00e5 vissa optimeringar. Till exempel v\u00e4ntar den en tid med tanke p\u00e5 att blocket kan komma att anv\u00e4ndas snart, vilket g\u00f6r att det kanske inte finns n\u00e5got syfte med att genomf\u00f6ra DISCARD-processen, samt f\u00f6rs\u00f6ker sammanfoga regioner innan den faktiska DISCARD-processen genomf\u00f6rs f\u00f6r att minska det totala antalet operationer.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52228\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043b\u044f \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b btrfs \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 DISCARD (\u043f\u043e\u043c\u0435\u0442\u043a\u0430 \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0451\u043d\u043d\u044b\u0445 \u0431\u043b\u043e\u043a\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0443\u0436\u0435 \u043c\u043e\u0436\u043d\u043e \u043d\u0435 \u0445\u0440\u0430\u043d\u0438\u0442\u044c \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438), \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u0430\u043c\u0438 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Facebook. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b: \u0432 \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 DISCARD \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e \u0441 \u043e\u0441\u0442\u0430\u043b\u044c\u043d\u044b\u043c\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f\u043c\u0438, \u0447\u0442\u043e \u0432 \u0440\u044f\u0434\u0435 \u0441\u043b\u0443\u0447\u0430\u0435\u0432 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u043e\u0436\u0438\u0434\u0430\u0442\u044c \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 \u043a\u043e\u043c\u0430\u043d\u0434 \u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u044f\u043c\u0438, \u0447\u0442\u043e \u0442\u0440\u0435\u0431\u0443\u0435\u0442 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f. \u042d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0441\u0442\u0430\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-55519","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043b\u044f \u0444\u0430\u0439\u043b\u043e\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b btrfs \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" 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