{"id":79056,"date":"2020-04-24T01:42:07","date_gmt":"2020-04-23T23:42:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux"},"modified":"2020-04-24T01:42:07","modified_gmt":"2020-04-23T23:42:07","slug":"facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","title":{"rendered":"Facebook heeft een nieuw geheugenbeheersysteem 'slab' voorgesteld voor de Linux-kernel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Roman Gushchin (<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/rgushchin\">Roman Gushchin<\/a><\/noindex>) van Facebook <noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2020\/4\/22\/1721\">gepubliceerd<\/a><\/noindex> in de mailinglijst van de Linux kernel ontwikkelaars met een set patches voor de implementatie van een nieuwe geheugen distributiecontroller <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Slab\">slab<\/a><\/noindex> (slab geheugencontroller). De nieuwe controller valt op vanwege het verplaatsen van de slab-accounting van het paginaniveau naar het objectniveau in de kernel, wat de mogelijkheid biedt om slab-pagina's gezamenlijk te gebruiken in verschillende cgroups, in plaats van afzonderlijke slab-caches voor elke cgroup aan te maken. <\/p>\n<p>De voorgestelde benadering maakt het mogelijk om de effici\u00ebntie van het gebruik van slab te verhogen, het gebruik van slab-geheugen met 30-45% te verminderen en het totale geheugengebruik door de kernel aanzienlijk te verlagen. Door het verminderen van het aantal niet-verplaatsbare slabs is er ook een positief effect op het gebied van het verminderen van geheugenfragmentatie. De nieuwe geheugencontroller vereenvoudigt de code voor de slab-accounting aanzienlijk en vereist geen gecompliceerde algoritmes voor het dynamisch aanmaken en verwijderen van slab-caches voor elke cgroup. Alle cgroups voor geheugen in de nieuwe implementatie gebruiken een gezamenlijke set slab-caches, en de levensduur van de slab-caches is niet langer gebonden aan de levensduur van de cgroup. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/doc\/Documentation\/cgroup-v1\/memory.txt\">beperkingen<\/a><\/noindex> voor geheugengebruik.<\/p>\n<p>De nieuwe slabcontroller biedt een nauwkeurigere resource-accounting, wat theoretisch de CPU meer zou moeten belasten, maar in de praktijk zijn de verschillen minimaal gebleken. De nieuwe slabcontroller wordt al enkele maanden gebruikt op de productie-servers van Facebook, die verschillende soorten workloads verwerken, en tot nu toe zijn er geen significante regressies vastgesteld. Er is echter een aanzienlijke vermindering van het geheugengebruik waargenomen - op sommige hosts is tot 1 GB geheugen bespaard, maar deze cijfers zijn sterk afhankelijk van het type belasting, de totale grootte van het RAM, het aantal CPU's en de specifieke manier van werken met geheugen. Eerder uitgevoerde tests <noindex><a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/798605\/\">aangetoond<\/a><\/noindex> toonden een vermindering van het geheugengebruik met 650-700 MB (42% van het slab-geheugen) op de web-frontend, 750-800 MB (35%) op de server met de database-cache en 700 MB (36%) op de DNS-server.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Bron: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52790\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u043e\u043c\u0430\u043d \u0413\u0443\u0449\u0438\u043d (Roman Gushchin) \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Facebook \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0432 \u0441\u043f\u0438\u0441\u043a\u0435 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u044f\u0434\u0440\u0430 Linux \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u043d\u043e\u0432\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438 slab (slab memory controller). \u041d\u043e\u0432\u044b\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440 \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u043e\u043c \u0443\u0447\u0451\u0442\u0430 slab \u0441 \u0443\u0440\u043e\u0432\u043d\u044f \u0441\u0442\u0440\u0430\u043d\u0438\u0446 \u043f\u0430\u043c\u044f\u0442\u0438 \u043d\u0430 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u044f\u0434\u0440\u0430, \u0447\u0442\u043e \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c slab-\u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 cgroup, \u0432\u043c\u0435\u0441\u0442\u043e \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u043a\u044d\u0448\u0435\u0439 slab \u0434\u043b\u044f [&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-79056","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- 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