{"id":102845,"date":"2022-01-03T15:36:38","date_gmt":"2022-01-03T13:36:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d0%be%d0%bf%d1%83%d0%b1%d0%bb%d0%b8%d0%ba%d0%be%d0%b2%d0%b0%d0%bd-%d0%bd%d0%b0%d0%b1%d0%be%d1%80-%d0%bf%d0%b0%d1%82%d1%87%d0%b5%d0%b9-%d1%83%d1%81%d0%ba%d0%be%d1%80%d1%8f%d1%8e%d1%89%d0%b8%d1%85"},"modified":"2022-01-03T15:36:38","modified_gmt":"2022-01-03T13:36:38","slug":"%d0%be%d0%bf%d1%83%d0%b1%d0%bb%d0%b8%d0%ba%d0%be%d0%b2%d0%b0%d0%bd-%d0%bd%d0%b0%d0%b1%d0%be%d1%80-%d0%bf%d0%b0%d1%82%d1%87%d0%b5%d0%b9-%d1%83%d1%81%d0%ba%d0%be%d1%80%d1%8f%d1%8e%d1%89%d0%b8%d1%85","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/%d0%be%d0%bf%d1%83%d0%b1%d0%bb%d0%b8%d0%ba%d0%be%d0%b2%d0%b0%d0%bd-%d0%bd%d0%b0%d0%b1%d0%be%d1%80-%d0%bf%d0%b0%d1%82%d1%87%d0%b5%d0%b9-%d1%83%d1%81%d0%ba%d0%be%d1%80%d1%8f%d1%8e%d1%89%d0%b8%d1%85","title":{"rendered":"Vydan\u00e1 sada patchov, ktor\u00e9 ur\u00fdch\u013euj\u00fa zostavovanie jadra Linuxu o 50-80%","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ingo Molnar, zn\u00e1my v\u00fdvoj\u00e1r jadra Linux a autor pl\u00e1nova\u010da \u00faloh CFS (Completely Fair Scheduler), navrhol na diskusiu v mailing liste v\u00fdvoj\u00e1rov jadra Linux s\u00e9riu patchov, ktor\u00e9 sa t\u00fdkaj\u00fa viac ako polovice v\u0161etk\u00fdch s\u00faborov v zdrojov\u00fdch k\u00f3doch jadra a zabezpe\u010duj\u00fa zv\u00fd\u0161enie r\u00fdchlosti \u00faplnej recompil\u00e1cie jadra o 50-80% v z\u00e1vislosti od nastaven\u00ed. Realizovan\u00e1 optimaliz\u00e1cia je pozoruhodn\u00e1 t\u00fdm, \u017ee je spojen\u00e1 s pridan\u00edm najv\u00e4\u010d\u0161ej sady zmien v hist\u00f3rii v\u00fdvoja jadra \u2014 na jednorazov\u00e9 zahrnutie je navrhnut\u00fdch 2297 patchov, ktor\u00e9 menia viac ako 25 tis\u00edc s\u00faborov (10 tis\u00edc hlavi\u010dkov\u00fdch s\u00faborov v adres\u00e1roch 'include\/' a 'arch\/*\/include\/' a 15 tis\u00edc s\u00faborov so zdrojov\u00fdmi k\u00f3dmi). <\/p>\n

Zv\u00fd\u0161enie v\u00fdkonu sa dosahuje zmenou met\u00f3dy spracovania hlavi\u010dkov\u00fdch s\u00faborov. Je pozorovan\u00e9, \u017ee za tridsa\u0165 rokov v\u00fdvoja jadra sa stav hlavi\u010dkov\u00fdch s\u00faborov stal deprimuj\u00facim v d\u00f4sledku ve\u013ek\u00e9ho po\u010dtu kr\u00ed\u017eov\u00fdch z\u00e1vislost\u00ed medzi s\u00fabormi. Pr\u00e1ca na re\u0161trukturaliz\u00e1cii hlavi\u010dkov\u00fdch s\u00faborov trvala viac ako rok a vy\u017eadovala si zna\u010dn\u00fa prer\u00e1bku hierarchie a z\u00e1vislost\u00ed. Po\u010das re\u0161trukturaliz\u00e1cie bola vykonan\u00e1 pr\u00e1ca na oddelen\u00ed defin\u00edci\u00ed typov a API pre r\u00f4zne subsyst\u00e9my jadra. <\/p>\n

Medzi vykonan\u00fdmi zmenami: oddelenie vysoko\u00farov\u0148ov\u00fdch hlavi\u010dkov\u00fdch s\u00faborov navz\u00e1jom, vyl\u00fa\u010denie prep\u00e1jaj\u00facich hlavi\u010dkov\u00fdch s\u00faborov inline-funkci\u00ed, vy\u010dlenenie hlavi\u010dkov\u00fdch s\u00faborov pre typy a API, zabezpe\u010denie s\u00faborovej zostavy hlavi\u010dkov\u00fdch s\u00faborov (asi 80 s\u00faborov malo ru\u0161iv\u00e9 z\u00e1vislosti, ktor\u00e9 sa vy\u017eadovali cez in\u00e9 hlavi\u010dkov\u00e9 s\u00fabory), automatick\u00e9 pridanie z\u00e1vislost\u00ed k s\u00faborom '.h' a '.c', krokov\u00e1 optimaliz\u00e1cia hlavi\u010dkov\u00fdch s\u00faborov, pou\u017eitie re\u017eimu 'CONFIG_KALLSYMS_FAST=y', selekt\u00edvna konsolid\u00e1cia C-s\u00faborov do zostavovac\u00edch blokov na zn\u00ed\u017eenie po\u010dtu objektov\u00fdch s\u00faborov. <\/p>\n

V d\u00f4sledku vykonanej pr\u00e1ce sa podarilo o 1-2 porad\u00ed zn\u00ed\u017ei\u0165 ve\u013ekos\u0165 hlavi\u010dkov\u00fdch s\u00faborov spracovan\u00fdch v \u0161t\u00e1diu post-preprocesovania. Napr\u00edklad pred optimaliz\u00e1ciou pou\u017eitie hlavi\u010dkov\u00e9ho s\u00faboru 'linux\/gfp.h' viedlo k pridaniu 13543 riadkov k\u00f3du a pripojeniu 303 z\u00e1visl\u00fdch hlavi\u010dkov\u00fdch s\u00faborov, zatia\u013e \u010do po optimaliz\u00e1cii sa ve\u013ekos\u0165 zn\u00ed\u017eila na 181 riadkov a 26 z\u00e1visl\u00fdch s\u00faborov. Alebo in\u00fd pr\u00edklad: pri preprocesovan\u00ed s\u00faboru 'kernel\/pid.c' bez patchu sa pripoj\u00ed 94 tis\u00edc riadkov k\u00f3du, v\u00e4\u010d\u0161ina ktor\u00e9ho sa v pid.c nepou\u017e\u00edva. Rozdelenie hlavi\u010dkov\u00fdch s\u00faborov umo\u017enilo zn\u00ed\u017ei\u0165 objem spracov\u00e1van\u00e9ho k\u00f3du na jednu tretinu, \u010d\u00edm sa po\u010det spracov\u00e1van\u00fdch riadkov zn\u00ed\u017eil na 36 tis\u00edc. <\/p>\n

Pri \u00faplnej prekompil\u00e1cii jadra pr\u00edkazom «make -j96 vmlinux» na testovacom syst\u00e9me aplik\u00e1cia patchov uk\u00e1zala skr\u00e1tenie \u010dasu kompil\u00e1cie vetvy v5.16-rc7 z 231,34 na 129,97 sek\u00fand (z 15,5 na 27,7 kompil\u00e1ci\u00ed za hodinu), ako aj zv\u00fd\u0161ila efekt\u00edvnos\u0165 vyu\u017e\u00edvania jadier CPU po\u010das kompil\u00e1cie. Pri inkrement\u00e1lnej kompil\u00e1cii je efekt optimaliz\u00e1cie e\u0161te v\u00fdraznej\u0161\u00ed — \u010das op\u00e4tovnej kompil\u00e1cie jadra po vykonan\u00ed zmien v hlavi\u010dkov\u00fdch s\u00faboroch sa skr\u00e1til nieko\u013ekokr\u00e1t (od 112% do 173% v z\u00e1vislosti od menen\u00e9ho hlavi\u010dkov\u00e9ho s\u00faboru). Optimaliz\u00e1cie s\u00fa zatia\u013e dostupn\u00e9 len pre architekt\u00fary ARM64, MIPS, Sparc a x86 (32- a 64-bit).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u043d\u0433\u043e \u041c\u043e\u043b\u043d\u0430\u0440 (Ingo Molnar), \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a Linux \u044f\u0434\u0440\u0430 \u0438 \u0430\u0432\u0442\u043e\u0440 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0437\u0430\u0434\u0430\u0447 CFS (Completely Fair Scheduler), \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u043e\u0431\u0441\u0443\u0436\u0434\u0435\u043d\u0438\u044f \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 \u0441\u0435\u0440\u0438\u044e \u043f\u0430\u0442\u0447\u0435\u0439, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0431\u043e\u043b\u0435\u0435 \u043f\u043e\u043b\u043e\u0432\u0438\u043d\u044b \u0432\u0441\u0435\u0445 \u0444\u0430\u0439\u043b\u043e\u0432 \u0432 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0445 \u0442\u0435\u043a\u0441\u0442\u0430\u0445 \u044f\u0434\u0440\u0430 \u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u0435 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u0438 \u043f\u043e\u043b\u043d\u043e\u0439 \u043f\u0435\u0440\u0435\u0441\u0431\u043e\u0440\u043a\u0438 \u044f\u0434\u0440\u0430 \u043d\u0430 50-80% \u0432 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043a. \u0420\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u044f \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u043e\u043d\u0430 […]<\/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-102845","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Zverejnen\u00fd s\u00fabor patchov ur\u00fdch\u013euj\u00facich kompil\u00e1ciu jadra Linux o 50-80% | ProHoster","description":"Ingo Molnar, zn\u00e1my v\u00fdvoj\u00e1r Linux jadra a autor pl\u00e1nova\u010da \u00faloh CFS (Completely Fair Scheduler), navrhol na diskusiu v mailing liste v\u00fdvoj\u00e1rov jadra Linux s\u00e9riu patchov, ktor\u00e9 sa 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