{"id":36877,"date":"2019-10-31T22:14:28","date_gmt":"2019-10-31T19:14:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati\/"},"modified":"2019-10-31T22:14:28","modified_gmt":"2019-10-31T19:14:28","slug":"yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati","title":{"rendered":"O n\u00facleo do Linux n\u00e3o consegue lidar suavemente com situa\u00e7\u00f5es de falta de mem\u00f3ria.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Na lista de distribui\u00e7\u00e3o dos desenvolvedores do n\u00facleo Linux <noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2019\/8\/4\/15\">levantou-se<\/a><\/noindex> um problema com o tratamento de situa\u00e7\u00f5es de esgotamento de mem\u00f3ria livre no Linux:<\/p>\n<blockquote>\n<p>\u00c9 um problema conhecido que tem incomodado muitas pessoas por v\u00e1rios anos e pode ser reproduzido em menos de alguns minutos na vers\u00e3o mais recente do n\u00facleo Linux 5.2.6. Todos os par\u00e2metros do n\u00facleo est\u00e3o definidos com os valores padr\u00e3o.<\/p>\n<p>Passos:<\/p>\n<ul>\n<li class=\"l\"> Estamos carregando com o par\u00e2metro \"mem=4G\".\n<li class=\"l\"> Desativamos o suporte a swap (sudo swapoff -a).\n<li class=\"l\"> Iniciamos qualquer navegador da web, como Chrome\/Chromium ou\/ e Firefox.\n<li class=\"l\"> Come\u00e7amos a abrir abas com sites e observamos como o volume de mem\u00f3ria livre diminui.\n<\/ul>\n<p>Assim que surge uma situa\u00e7\u00e3o em que uma nova aba requer mais mem\u00f3ria RAM do que est\u00e1 dispon\u00edvel, o sistema praticamente congela por completo. Voc\u00ea ter\u00e1 dificuldade at\u00e9 para mover o cursor do mouse. O indicador do disco r\u00edgido piscar\u00e1 incessantemente (n\u00e3o sei por qu\u00ea). Voc\u00ea n\u00e3o conseguir\u00e1 iniciar novos aplicativos ou fechar os j\u00e1 abertos.<\/p>\n<p>Essa pequena crise pode durar minutos ou mais. Suspeito que o sistema n\u00e3o deveria se comportar assim. Acredito que \u00e9 necess\u00e1rio fazer algo para evitar essas \"paradas\".<\/p>\n<p>Estou quase certo de que \u00e9 poss\u00edvel ajustar alguns par\u00e2metros do sysctl para evitar tais situa\u00e7\u00f5es, mas algo me diz que isso pode ser feito por padr\u00e3o para todos, pois usu\u00e1rios n\u00e3o t\u00e9cnicos que enfrentam esse problema simplesmente desistir\u00e3o de usar o Linux e n\u00e3o ter\u00e3o a paci\u00eancia de procurar solu\u00e7\u00f5es no Google.\n<\/p><\/blockquote>\n<p>Em <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/linux\/comments\/cmg48b\/lets_talk_about_the_elephant_in_the_room_the\/\">coment\u00e1rios<\/a><\/noindex> no Reddit, alguns usu\u00e1rios sugerem habilitar o swap, mas isso n\u00e3o resolve o problema, apenas o adia e muitas vezes agrava. Como solu\u00e7\u00e3o potencial no futuro, pode ser atra\u00edda a rec\u00e9m-chegada no n\u00facleo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49842\">4.20<\/a><\/noindex> e aprimorada no n\u00facleo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51051\">5.2<\/a><\/noindex> sub-sistema PSI (Pressure Stall Information), que permite analisar informa\u00e7\u00f5es sobre o tempo de espera para obter diversos recursos (CPU, mem\u00f3ria, entrada\/sa\u00edda). Este subsistema possibilita o monitoramento da falta de mem\u00f3ria em uma fase inicial, identificar a fonte dos problemas e encerrar aplicativos irrelevantes, evitando que surjam efeitos vis\u00edveis para o usu\u00e1rio. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51231\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \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 \u043f\u043e\u0434\u043d\u044f\u0442\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438 \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044f \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u0432 Linux: \u0418\u0437\u0432\u0435\u0441\u0442\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0434\u043e\u043d\u0438\u043c\u0430\u0435\u0442 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u043b\u044e\u0434\u0435\u0439 \u043d\u0430 \u043f\u0440\u043e\u0442\u044f\u0436\u0435\u043d\u0438\u0438 \u043c\u043d\u043e\u0433\u0438\u0445 \u043b\u0435\u0442 \u0438 \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0432\u043e\u0441\u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0441\u0442\u0438 \u043c\u0435\u043d\u044c\u0448\u0435, \u0447\u0435\u043c \u0437\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043c\u0438\u043d\u0443\u0442 \u043d\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 Linux 5.2.6. \u0412\u0441\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u044f\u0434\u0440\u0430 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u044b \u0432 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0428\u0430\u0433\u0438: \u0417\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u0441\u044f \u0441 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u043c &#171;mem=4G&#187;. \u0412\u044b\u043a\u043b\u044e\u0447\u0430\u0435\u043c [&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-36877","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One 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