{"id":52100,"date":"2019-10-31T00:00:00","date_gmt":"2019-10-30T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/microsoft-realizoval-v-wsl2-windows-subsystem-for-linux-vozvrashhenie-pamyati-sisteme"},"modified":"2020-02-18T13:59:46","modified_gmt":"2020-02-18T10:59:46","slug":"microsoft-realizoval-v-wsl2-windows-subsystem-for-linux-vozvrashhenie-pamyati-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/microsoft-realizoval-v-wsl2-windows-subsystem-for-linux-vozvrashhenie-pamyati-sisteme","title":{"rendered":"Microsoft implementoval v WSL2 (Windows Subsystem for Linux) n\u00e1vrat pam\u011bti syst\u00e9mu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spole\u010dnost Microsoft ozn\u00e1mila<\/a><\/noindex> o roz\u0161\u00ed\u0159en\u00ed mo\u017enost\u00ed vrstvy WSL2 (Windows Subsystem for Linux), kter\u00e1 umo\u017e\u0148uje spou\u0161t\u011bn\u00ed spustiteln\u00fdch soubor\u016f Linuxu ve Windows. V experiment\u00e1ln\u00edch sestaven\u00edch Windows Insider<\/a><\/noindex> (sestaven\u00ed 19013) ve vrstv\u011b WSL2 byla p\u0159id\u00e1na podpora vracen\u00ed pam\u011bti syst\u00e9mu (Memory Reclamation), kterou uvolnily procesy b\u011b\u017e\u00edc\u00ed v prost\u0159ed\u00ed zalo\u017een\u00e9m na j\u00e1d\u0159e Linux. <\/p>\n

D\u0159\u00edve, pokud do\u0161lo k n\u00e1r\u016fstu spot\u0159eby pam\u011bti aplikacemi nebo j\u00e1drem, byla pam\u011b\u0165 p\u0159id\u011blena virtu\u00e1ln\u00ed ma\u0161in\u011b WSL2, ale pot\u00e9 z\u016fst\u00e1vala zafixov\u00e1na a nebyla vracena syst\u00e9mu, i po ukon\u010den\u00ed n\u00e1ro\u010dn\u00e9ho procesu a p\u0159i absenci dal\u0161\u00ed pot\u0159eby po p\u0159id\u011blen\u00e9 pam\u011bti. Mechanismus Memory Reclamation umo\u017e\u0148uje vr\u00e1tit uvoln\u011bnou pam\u011b\u0165 zp\u011bt do hlavn\u00edho opera\u010dn\u00edho syst\u00e9mu a automaticky zmen\u0161ovat velikost pam\u011bti virtu\u00e1ln\u00ed ma\u0161iny. P\u0159itom se vrac\u00ed nejen pam\u011b\u0165 uvoln\u011bn\u00e1 u\u017eivatelsk\u00fdmi procesy, ale tak\u00e9 pam\u011b\u0165 pou\u017e\u00edvan\u00e1 pro ukl\u00e1d\u00e1n\u00ed do vyrovn\u00e1vac\u00ed pam\u011bti v j\u00e1dru Linuxu. Nap\u0159\u00edklad p\u0159i vysok\u00e9 diskov\u00e9 aktivit\u011b se zvy\u0161uje velikost str\u00e1nkovac\u00edho vyrovn\u00e1vac\u00edho pam\u011bti, do kter\u00e9ho se ukl\u00e1d\u00e1 obsah soubor\u016f p\u0159i pr\u00e1ci se souborov\u00fdm syst\u00e9mem. Po proveden\u00ed «echo 1 > \/proc\/sys\/vm\/drop_caches» lze vyrovn\u00e1vac\u00ed pam\u011b\u0165 vymazat a vr\u00e1tit pam\u011b\u0165 zp\u011bt do hlavn\u00edho opera\u010dn\u00edho syst\u00e9mu.<\/p>\n

Implementace Memory Reclamation se zakl\u00e1d\u00e1 na
\npatchi<\/a><\/noindex>, kter\u00fd navrhli in\u017een\u00fd\u0159i Intel pro za\u0159azen\u00ed do hlavn\u00edho j\u00e1dra Linux s c\u00edlem roz\u0161\u00ed\u0159it mo\u017enosti ovlada\u010de virtio-balloon a pro syst\u00e9m spr\u00e1vy pam\u011bti. Tento patch je ur\u010den pro pou\u017eit\u00ed v jak\u00fdchkoli hostovan\u00fdch syst\u00e9mech pro vracen\u00ed nevyu\u017e\u00edvan\u00fdch str\u00e1nek pam\u011bti hostitelsk\u00e9mu syst\u00e9mu a m\u016f\u017ee b\u00fdt pou\u017eit s r\u016fzn\u00fdmi hypervizory. V p\u0159\u00edpad\u011b WSL2 byl patch p\u0159izp\u016fsoben pro vracen\u00ed pam\u011bti hypervizoru Hyper-V.<\/p>\n

P\u0159ipome\u0148me, \u017ee druh\u00e1 verze WSL se li\u0161\u00ed<\/a><\/noindex> p\u0159in\u00e1\u0161\u00ed plnohodnotn\u00e9 j\u00e1dro Linux m\u00edsto emul\u00e1toru, kter\u00fd na rozhran\u00ed p\u0159ev\u00e1d\u00ed syst\u00e9mov\u00e9 vol\u00e1n\u00ed Linuxu na syst\u00e9mov\u00e1 vol\u00e1n\u00ed Windows. Dod\u00e1van\u00e9 v WSL2 j\u00e1dro Linux<\/a><\/noindex> je zalo\u017eeno na vyd\u00e1n\u00ed 4.19, kter\u00e9 b\u011b\u017e\u00ed v prost\u0159ed\u00ed Windows pomoc\u00ed virtu\u00e1ln\u00edho stroje ji\u017e pou\u017e\u00edvan\u00e9ho v Azure. Aktualizace pro j\u00e1dro Linux jsou doru\u010dov\u00e1ny prost\u0159ednictv\u00edm mechanismu Windows Update a testov\u00e1ny v infrastruktu\u0159e kontinu\u00e1ln\u00ed integrace Microsoftu. V j\u00e1dru pou\u017eit\u00e9 specifick\u00e9 pro WSL2 patche zahrnuj\u00ed optimalizace pro zkr\u00e1cen\u00ed \u010dasu spu\u0161t\u011bn\u00ed j\u00e1dra, sn\u00ed\u017een\u00ed spot\u0159eby pam\u011bti a ponech\u00e1n\u00ed v j\u00e1d\u0159e minim\u00e1ln\u011b pot\u0159ebn\u00e9ho souboru ovlada\u010d\u016f a subsyst\u00e9m\u016f.<\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Microsoft \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0430 \u043e \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0435\u0439 \u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0438 WSL2 (Windows Subsystem for Linux), \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0439 \u0437\u0430\u043f\u0443\u0441\u043a \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432 Linux \u0432 Windows. \u0412 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0431\u043e\u0440\u043a\u0430\u0445 Windows Insider (build 19013) \u0432 \u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0435 WSL2 \u043f\u043e\u044f\u0432\u0438\u043b\u0430\u0441\u044c \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0435\u043d\u0438\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043f\u0430\u043c\u044f\u0442\u0438 (Memory Reclamation), \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c\u0438, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u043c\u0438 \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u043d\u0430 \u0431\u0430\u0437\u0435 \u044f\u0434\u0440\u0430 Linux. \u0420\u0430\u043d\u0435\u0435 \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 \u0440\u043e\u0441\u0442\u0430 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u043c\u0438 \u0438\u043b\u0438 \u044f\u0434\u0440\u043e\u043c, \u043f\u0430\u043c\u044f\u0442\u044c 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