{"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\/sk\/blog\/news\/yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati","title":{"rendered":"Jadro Linuxu nevie jemne spracova\u0165 situ\u00e1cie s nedostatkom pam\u00e4te","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Na zozname e-mailov\u00fdch skup\u00edn v\u00fdvoj\u00e1rov jadra Linux <noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2019\/8\/4\/15\">bol otvoren\u00fd<\/a><\/noindex> probl\u00e9m s spracovan\u00edm situ\u00e1cie vy\u010derpanosti vo\u013enej pam\u00e4te v syst\u00e9me Linux:<\/p>\n<blockquote>\n<p>Je zn\u00e1my probl\u00e9m, ktor\u00fd tr\u00e1pi mno\u017estvo \u013eud\u00ed po mnoho rokov a ktor\u00fd sa d\u00e1 reprodukova\u0165 za menej ako nieko\u013eko min\u00fat na poslednej verzii jadra Linux 5.2.6. V\u0161etky parametre jadra s\u00fa nastaven\u00e9 na predvolen\u00e9 hodnoty.<\/p>\n<p>Kroky:<\/p>\n<ul>\n<li class=\"l\"> Na\u010d\u00edtame sa s parametrom \u201emem=4G.\u201c\n<li class=\"l\"> Vypneme podporu swapu (sudo swapoff -a).\n<li class=\"l\"> Spust\u00edme ak\u00fdko\u013evek webov\u00fd prehliada\u010d, napr\u00edklad Chrome\/Chromium alebo\/y Firefox.\n<li class=\"l\"> Za\u010dneme otv\u00e1ra\u0165 karty s webov\u00fdmi str\u00e1nkami a sledujeme, ako sa zmen\u0161uje objem vo\u013enej pam\u00e4te.\n<\/ul>\n<p>Akon\u00e1hle nastane situ\u00e1cia, ke\u010f nov\u00e1 karta vy\u017eaduje viac pam\u00e4te, ako je k dispoz\u00edcii, syst\u00e9m takmer \u00faplne zamrzne. Budete \u0165a\u017eko schopn\u00ed pohybova\u0165 kurzorom my\u0161i. Indik\u00e1tor pevn\u00e9ho disku bude blika\u0165 bez prestania (nech\u00e1pem pre\u010do). Nebudete m\u00f4c\u0165 spusti\u0165 nov\u00e9 aplik\u00e1cie alebo zavrie\u0165 aktu\u00e1lne spusten\u00e9.<\/p>\n<p>Tento mal\u00fd krizov\u00fd stav m\u00f4\u017ee trva\u0165 min\u00faty alebo dlh\u0161ie. Predpoklad\u00e1m, \u017ee syst\u00e9m by sa takto spr\u00e1va\u0165 nemal. Mysl\u00edm, \u017ee je potrebn\u00e9 nie\u010do urobi\u0165, aby sme predi\u0161li tak\u00fdmto \u201ezam\u0155zaniu.\u201c<\/p>\n<p>Som skoro presved\u010den\u00fd, \u017ee je mo\u017en\u00e9 zmeni\u0165 niektor\u00e9 parametre sysctl, aby sa predi\u0161lo podobn\u00fdm situ\u00e1ci\u00e1m, ale nie\u010do mi nazna\u010duje, \u017ee to m\u00f4\u017ee by\u0165 nastaven\u00e9 ako predvolen\u00e9 pre v\u0161etk\u00fdch, preto\u017ee netechnick\u00ed u\u017e\u00edvatelia, ktor\u00ed sa s tak\u00fdmto probl\u00e9mom stretn\u00fa, sa jednoducho vzdaj\u00fa pou\u017e\u00edvania Linuxu a nebud\u00fa ma\u0165 chu\u0165 h\u013eada\u0165 rie\u0161enia cez Google.\n<\/p><\/blockquote>\n<p>V <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/linux\/comments\/cmg48b\/lets_talk_about_the_elephant_in_the_room_the\/\">koment\u00e1roch<\/a><\/noindex> na Reddite niektor\u00ed pou\u017e\u00edvatelia navrhuj\u00fa zapn\u00fa\u0165 swap, ale to probl\u00e9m nerie\u0161i, len ho od\u010fa\u013euje a \u010dasto zhor\u0161uje. Ako mo\u017en\u00e9 rie\u0161enie v bud\u00facnosti m\u00f4\u017ee by\u0165 zapojen\u00e1 nov\u00e1 funkcia v jadre <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49842\">4.20<\/a><\/noindex> a vylep\u0161en\u00e1 v jadre <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51051\">5.2<\/a><\/noindex> podsubsystem PSI (Pressure Stall Information), ktor\u00fd umo\u017e\u0148uje analyzova\u0165 inform\u00e1cie o \u010dakacej dobe pri z\u00edskavan\u00ed r\u00f4znych zdrojov (CPU, pam\u00e4\u0165, vstup\/v\u00fdstup). Tento podsystem umo\u017e\u0148uje sledova\u0165 nedostatok pam\u00e4te v po\u010diato\u010dnej f\u00e1ze, ur\u010di\u0165 zdroj probl\u00e9mov a ukon\u010di\u0165 menej d\u00f4le\u017eit\u00e9 aplik\u00e1cie, bez toho, aby do\u0161lo k vidite\u013en\u00fdm \u00fa\u010dinkom pre u\u017e\u00edvate\u013ea. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <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 SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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