{"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\/de\/blog\/news\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","title":{"rendered":"Facebook hat einen neuen Slab-Speicherverwaltungsmechanismus f\u00fcr den Linux-Kernel vorgeschlagen","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>) von Facebook <noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2020\/4\/22\/1721\">ver\u00f6ffentlichte<\/a><\/noindex> im Newsletter f\u00fcr Entwickler des Linux-Kernels ein Patchset mit der Implementierung eines neuen Slab-Speichercontrollers <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Slab\">slab<\/a><\/noindex> (slab Speichercontroller). Der neue Controller zeichnet sich dadurch aus, dass die Buchhaltung des Slabs von der Seitenebene auf die Objektebene des Kernels verlagert wird, was die gemeinsame Nutzung von Slab-Seiten zwischen verschiedenen cgroups erm\u00f6glicht, anstatt separate Slab-Caches f\u00fcr jede cgroup bereitzustellen. <\/p>\n<p>Der vorgeschlagene Ansatz erm\u00f6glicht eine effizientere Nutzung von Slab, reduziert den f\u00fcr Slab verwendeten Speicher um 30-45% und verringert den gesamten Speicherbedarf des Kernels erheblich. Durch die Reduzierung der Anzahl nicht verschiebbarer Slabs gibt es auch positive Effekte im Bereich der Verringerung von Speicherfragmentierung. Der neue Speichercontroller vereinfacht den Code zur Buchhaltung von Slabs erheblich und erfordert keine komplexen Algorithmen zur dynamischen Erstellung und L\u00f6schung von Slab-Caches f\u00fcr jede cgroup. Alle cgroups f\u00fcr den Speicher verwenden in der neuen Implementierung einen gemeinsamen Satz von Slab-Caches, und die Lebensdauer der Slab-Caches ist nicht mehr an die Lebensdauer der \u00fcber cgroups festgelegten Ressourcen gebunden. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/doc\/Documentation\/cgroup-v1\/memory.txt\">Einschr\u00e4nkungen<\/a><\/noindex> zur Speichernutzung.<\/p>\n<p>Der im neuen Slab-Controller implementierte genauere Ressourcenverbrauch sollte theoretisch die CPU st\u00e4rker belasten, doch in der Praxis waren die Unterschiede nicht signifikant. Der neue Slab-Controller wird seit mehreren Monaten auf den Produktionsservern von Facebook eingesetzt, die verschiedene Lasten verarbeiten, und es wurden bisher keine nennenswerten Regressionen festgestellt. Gleichzeitig ist ein erheblicher R\u00fcckgang des Speicherverbrauchs zu beobachten \u2013 in einigen Hostumgebungen konnte bis zu 1 GB RAM eingespart werden, jedoch h\u00e4ngt dieser Wert stark von der Art der Last, der Gesamtgr\u00f6\u00dfe des RAM, der Anzahl der CPUs und den Eigenschaften der Speicherverwendung ab. Fr\u00fchere Tests wurden durchgef\u00fchrt. <noindex><a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/798605\/\">haben wir gezeigt,<\/a><\/noindex> zeigten eine Einsparung beim Speicherverbrauch von 650-700 MB (42% des Slab-Speichers) auf dem Web-Frontend, 750-800 MB (35%) auf einem Server mit einem Cache der DBMS und 700 MB (36%) auf einem DNS-Server.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Quelle: <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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