{"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\/ro\/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":"A fost publicat un set de patch-uri care accelereaz\u0103 compilarea nucleului Linux cu 50-80%","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ingo Molnar, un cunoscut dezvoltator al nucleului Linux \u0219i autor al planificatorului de sarcini CFS (Completely Fair Scheduler), a propus pentru discu\u021bie pe lista de coresponden\u021b\u0103 a dezvoltatorilor nucleului Linux o serie de patch-uri care afecteaz\u0103 mai mult de jum\u0103tate din toate fi\u0219ierele din codul surs\u0103 al nucleului \u0219i care asigur\u0103 o cre\u0219tere a vitezei recompil\u0103rii complete a nucleului cu 50-80%, \u00een func\u021bie de set\u0103ri. Optimizarea realizat\u0103 este notabil\u0103 prin faptul c\u0103 vine cu cel mai mare set de modific\u0103ri din istoria dezvolt\u0103rii nucleului \u2014 fiind propuse pentru includere 2297 de patch-uri, care modific\u0103 peste 25 de mii de fi\u0219iere (10 mii de fi\u0219iere header \u00een directoarele \u201einclude\/\u201d \u0219i \u201earch\/*\/include\/\u201d \u0219i 15 mii de fi\u0219iere cu cod surs\u0103). <\/p>\n

Cre\u0219terea performan\u021bei este realizat\u0103 prin schimbarea metodei de procesare a fi\u0219ierelor header. Se observ\u0103 c\u0103, \u00een cei treizeci de ani de dezvoltare a nucleului, starea fi\u0219ierelor header a devenit dezolant\u0103 din cauza unui num\u0103r mare de dependen\u021be \u00eencruci\u0219ate \u00eentre fi\u0219iere. Lucr\u0103rile de restructurare a fi\u0219ierelor header au durat mai bine de un an \u0219i au necesitat o revizuire semnificativ\u0103 a ierarhiei \u0219i a dependen\u021belor. \u00cen timpul restructur\u0103rii, au fost realizate lucr\u0103ri de separare a defini\u021biilor de tipuri \u0219i API-uri pentru diferitele subsisteme ale nucleului. <\/p>\n

Printre modific\u0103rile aduse se num\u0103r\u0103: separarea fi\u0219ierelor header de nivel \u00eenalt unele de altele, excluderea fi\u0219ierelor header de leg\u0103tur\u0103 inline, alocarea de fi\u0219iere header pentru tipuri \u0219i API, asigurarea unei compil\u0103ri separate pentru fi\u0219ierele header (aproximativ 80 de fi\u0219iere aveau dependen\u021be indirecte care interferau cu compilarea, definite prin alte fi\u0219iere header), ad\u0103ugarea automat\u0103 a dependen\u021belor la fi\u0219ierele \u201e.h\u201d \u0219i \u201e.c\u201d, optimizarea pas cu pas a fi\u0219ierelor header, utilizarea modului \u201eCONFIG_KALLSYMS_FAST=y\u201d, consolidarea selectiv\u0103 a fi\u0219ierelor C \u00een blocuri de compilare pentru a reduce num\u0103rul de fi\u0219iere obiect. <\/p>\n

\u00cen consecin\u021b\u0103, munca realizat\u0103 a permis reducerea dimensiunii fi\u0219ierelor header procesate \u00een faza de post-preprocesare cu 1-2 ordine de magnitudine. De exemplu, \u00eenainte de optimizare, utilizarea fi\u0219ierului header \u201elinux\/gfp.h\u201d ducea la ad\u0103ugarea a 13543 de linii de cod \u0219i la conectarea a 303 fi\u0219iere header dependente, iar dup\u0103 optimizare, dimensiunea a fost redus\u0103 la 181 linii \u0219i 26 de fi\u0219iere dependente. Sau un alt exemplu: \u00een timpul preproces\u0103rii fi\u0219ierului \u201ekernel\/pid.c\u201d f\u0103r\u0103 patch, se conectau 94 de mii de linii de cod, cea mai mare parte fiind neutilizat\u0103 \u00een pid.c. Separarea fi\u0219ierelor header a permis reducerea volumului de cod procesat de trei ori, sc\u0103z\u00e2nd num\u0103rul de linii procesate la 36 de mii. <\/p>\n

\u00cen cadrul recompil\u0103rii complete a nucleului cu comanda «make -j96 vmlinux» pe sistemul de testare, aplicarea patch-urilor a dus la reducerea timpului de compilare al ramurii v5.16-rc7 de la 231.34 la 129.97 secunde (de la 15.5 la 27.7 compil\u0103ri pe or\u0103), precum \u0219i la cre\u0219terea eficien\u021bei utiliz\u0103rii nucleelor CPU \u00een timpul compil\u0103rii. \u00cen cazul compil\u0103rii incrementale, efectul optimiz\u0103rii este \u0219i mai evident \u2014 timpul de recompilare a nucleului dup\u0103 modific\u0103rile \u00een fi\u0219ierele de antet a sc\u0103zut semnificativ (\u00eentre 112% \u0219i 173%, \u00een func\u021bie de fi\u0219ierul de antet modificat). Optimiz\u0103rile sunt disponibile doar pentru arhitecturile ARM64, MIPS, Sparc \u0219i x86 (32 \u0219i 64 de bi\u021bi).
\n
Sursa: opennet.ro<\/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\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\udd47 A fost publicat un set de patch-uri care accelereaz\u0103 compilarea nucleului Linux cu 50-80% | ProHoster","description":"Ingo Molnar, cunoscut dezvoltator al nucleului Linux \u0219i autor al planificatorului de sarcini CFS (Completely Fair Scheduler), a propus pentru discu\u021bie \u00een lista de coresponden\u021b\u0103 a dezvoltatorilor nucleului Linux o serie de patch-uri care 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