{"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\/cs\/blog\/news\/yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati","title":{"rendered":"J\u00e1dro Linux nedok\u00e1\u017ee jemn\u011b zpracov\u00e1vat situace s nedostatkem pam\u011bti","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Na seznamu distribuce v\u00fdvoj\u00e1\u0159\u016f j\u00e1dra Linux <noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2019\/8\/4\/15\">zv\u00fd\u0161ena<\/a><\/noindex> probl\u00e9m se zpracov\u00e1n\u00edm situace vy\u010derp\u00e1n\u00ed voln\u00e9 pam\u011bti v Linuxu:<\/p>\n<blockquote>\n<p>Je zn\u00e1ma probl\u00e9m, kter\u00fd tr\u00e1p\u00ed mnoho lid\u00ed po dlouhou dobu a kter\u00fd je mo\u017en\u00e9 reprodukovat za m\u00e9n\u011b ne\u017e n\u011bkolik minut na posledn\u00ed verzi j\u00e1dra Linux 5.2.6. V\u0161echny parametry j\u00e1dra jsou nastaveny na v\u00fdchoz\u00ed hodnoty.<\/p>\n<p>Kroky:<\/p>\n<ul>\n<li class=\"l\"> Na\u010d\u00edt\u00e1me s parametrem \u201emem=4G\u201c.\n<li class=\"l\"> Zakazujeme podporu swapu (sudo swapoff -a).\n<li class=\"l\"> Spou\u0161t\u00edme jak\u00fdkoli webov\u00fd prohl\u00ed\u017ee\u010d, nap\u0159\u00edklad Chrome\/Chromium nebo\/i Firefox.\n<li class=\"l\"> Za\u010d\u00edn\u00e1me otev\u00edrat z\u00e1lo\u017eky se str\u00e1nkami a sledujeme, jak se sni\u017euje objem voln\u00e9 pam\u011bti.\n<\/ul>\n<p>Jakmile nastane situace, kdy nov\u00e1 z\u00e1lo\u017eka vy\u017eaduje v\u00edce opera\u010dn\u00ed pam\u011bti, ne\u017e je k dispozici, syst\u00e9m se t\u00e9m\u011b\u0159 \u00fapln\u011b zasekne. Dokonce i obt\u00ed\u017en\u011b pohybujete kurzorem my\u0161i. Indik\u00e1tor pevn\u00e9ho disku blik\u00e1 neust\u00e1le (nech\u00e1pu pro\u010d). Nebudete moci spustit nov\u00e9 aplikace ani zav\u0159\u00edt aktu\u00e1ln\u011b spu\u0161t\u011bn\u00e9.<\/p>\n<p>Tento mal\u00fd krizov\u00fd stav m\u016f\u017ee trvat minuty nebo d\u00e9le. P\u0159edpokl\u00e1d\u00e1m, \u017ee syst\u00e9m by se takto chovat nem\u011bl. Mysl\u00edm, \u017ee je pot\u0159eba ud\u011blat n\u011bco, aby se t\u011bmto \u201ezamrz\u00e1n\u00edm\u201c p\u0159ede\u0161lo.<\/p>\n<p>Jsem t\u00e9m\u011b\u0159 p\u0159esv\u011bd\u010den, \u017ee je mo\u017en\u00e9 zm\u011bnit n\u011bkter\u00e9 parametry sysctl, aby se p\u0159ede\u0161lo podobn\u00fdm situac\u00edm, ale n\u011bco mi \u0159\u00edk\u00e1, \u017ee to lze ud\u011blat jako v\u00fdchoz\u00ed pro v\u0161echny, proto\u017ee netechnick\u00e9 u\u017eivatele, kte\u0159\u00ed se setkaj\u00ed s takov\u00fdm probl\u00e9mem, prost\u011b odrad\u00ed od pou\u017e\u00edv\u00e1n\u00ed Linuxu a nebudou m\u00edt \u010das hledat \u0159e\u0161en\u00ed na Googlu.\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\u00e1\u0159\u00edch<\/a><\/noindex> na Reddit n\u011bkte\u0159\u00ed u\u017eivatel\u00e9 navrhuj\u00ed zapnout swap, ale to probl\u00e9m ne\u0159e\u0161\u00ed, jen ho odsune a \u010dasto zhor\u0161uje. Jako mo\u017en\u00e9 \u0159e\u0161en\u00ed v budoucnu by mohla b\u00fdt zapracov\u00e1na nov\u00e1 funkce j\u00e1dra <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49842\">4.20<\/a><\/noindex> a vylep\u0161en\u00e1 v j\u00e1d\u0159e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51051\">5.2<\/a><\/noindex> podsystem PSI (Pressure Stall Information), kter\u00fd umo\u017e\u0148uje analyzovat informace o \u010dekac\u00ed dob\u011b na z\u00edsk\u00e1n\u00ed r\u016fzn\u00fdch zdroj\u016f (CPU, pam\u011b\u0165, vstup\/v\u00fdstup). Tento podsystem umo\u017e\u0148uje sledovat nedostatek pam\u011bti v ran\u00e9m st\u00e1diu, identifikovat zdroj probl\u00e9m\u016f a ukon\u010dovat m\u00e9n\u011b d\u016fle\u017eit\u00e9 aplikace, ani\u017e by do\u0161lo k projev\u016fm viditeln\u00fdm u\u017eivateli. <\/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 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