{"id":37146,"date":"2019-10-31T22:15:59","date_gmt":"2019-10-31T19:15:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/kompaniya-oracle-namerena-pererabotat-dtrace-dlya-linux-s-ispolzovaniem-ebpf\/"},"modified":"2019-10-31T22:15:59","modified_gmt":"2019-10-31T19:15:59","slug":"kompaniya-oracle-namerena-pererabotat-dtrace-dlya-linux-s-ispolzovaniem-ebpf","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/kompaniya-oracle-namerena-pererabotat-dtrace-dlya-linux-s-ispolzovaniem-ebpf","title":{"rendered":"Oracle planerar att omarbeta DTrace f\u00f6r Linux med hj\u00e4lp av eBPF","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Oracle rapporterade<\/a><\/noindex> om arbetet med att \u00f6verf\u00f6ra DTrace-relaterade \u00e4ndringar till upstream och planerna f\u00f6r implementering av teknologin f\u00f6r dynamisk fels\u00f6kning av DTrace ovanp\u00e5 den befintliga infrastrukturen i Linux-k\u00e4rnan, s\u00e4rskilt med anv\u00e4ndning av s\u00e5dana underprogram som eBPF. Ursprungligen var den st\u00f6rsta problematiken med att anv\u00e4nda DTrace i Linux licenskompatibilitet, men \u00e5r 2018 licensierade Oracle om<\/a><\/noindex> DTrace-koden under GPLv2. <\/p>\n

DTrace har redan l\u00e4nge<\/a><\/noindex> erbjudits som en del av det ut\u00f6kade k\u00e4rnan f\u00f6r Oracle Linux-distributionen, men f\u00f6r att anv\u00e4nda den i andra distributioner kr\u00e4vs till\u00e4mpning av ytterligare k\u00e4rnpatchar, vilket begr\u00e4nsar anv\u00e4ndningen av den n\u00e4mnda teknologin. Som exempel har Oracle beredd av<\/a><\/noindex> en detaljerad instruktion f\u00f6r installation och anv\u00e4ndning av DTrace i Fedora Linux. F\u00f6r installationen kr\u00e4vs byggnad av verktygsl\u00e5dan<\/a><\/noindex> och anv\u00e4ndning av en Linux-k\u00e4rna, ombyggd med patchar<\/a><\/noindex>. F\u00f6r att automatisera byggprocessen av k\u00e4rnan med Oracle- och Fedora-patchar f\u00f6reslogs skript<\/a><\/noindex>.<\/p>\n

eBPF \u00e4r en inbyggd bytekodstolk i Linux-k\u00e4rnan som m\u00f6jligg\u00f6r skapande av n\u00e4tverksoperationers hanterare, \u00f6vervakning av systemets arbete, f\u00e5ngst av systemanrop, kontroll av \u00e5tkomst, hantering av h\u00e4ndelser med tidsm\u00e4tning (perf_event_open), ber\u00e4kning av frekvens och tids\u00e5tg\u00e5ng f\u00f6r operationer, samt sp\u00e5rning med hj\u00e4lp av kprobes\/uprobes\/tracepoints. Tack vare till\u00e4mpningen av JIT-kompilering \u00f6vers\u00e4tts bytekoden dynamiskt till maskininstruktioner och k\u00f6rs med prestanda liknande inbyggd kod. DTrace kan implementeras ovanp\u00e5 eBPF, p\u00e5 samma s\u00e4tt som fungerar<\/a><\/noindex> befintliga sp\u00e5rningsverktyg.<\/p>\n

DTrace-teknologin utvecklades f\u00f6r operativsystemet Solaris f\u00f6r att l\u00f6sa problem med dynamisk sp\u00e5rning av systemets k\u00e4rna och slutliga applikationer, vilket ger anv\u00e4ndaren m\u00f6jlighet att noggrant sp\u00e5ra systemets beteende och diagnostisera problem i realtid. Vid fels\u00f6kning p\u00e5verkar DTrace inte prestandan hos de unders\u00f6kta applikationerna och p\u00e5verkar inte deras drift, vilket m\u00f6jligg\u00f6r analys av aktiva system i realtid. Bland DTrace:s styrkor m\u00e4rks det h\u00f6g niv\u00e5spr\u00e5ket D, som liknar AWK, d\u00e4r det \u00e4r betydligt enklare att skapa sp\u00e5rningsskript \u00e4n med de verktyg som erbjuds f\u00f6r eBPF f\u00f6r att skriva hanterare p\u00e5 C, Python och Lua med externa bibliotek. <\/p>\n

Ingenj\u00f6rer fr\u00e5n Oracle arbetar ocks\u00e5 med att skapa en eBPF-backend f\u00f6r GCC och har redan publicerat ett antal patchar<\/a><\/noindex> f\u00f6r att integrera st\u00f6d f\u00f6r eBPF i GCC och har uppn\u00e5tt<\/a><\/noindex> inkluderingen av kod f\u00f6r st\u00f6d f\u00f6r eBPF i GNU binutils. Ursprungligen baseras backenden f\u00f6r st\u00f6d f\u00f6r eBPF p\u00e5 LLVM-teknologier, men Oracle \u00e4r intresserade av att inf\u00f6ra en inbyggd m\u00f6jlighet i GCC f\u00f6r att generera program f\u00f6r eBPF, vilket skulle m\u00f6jligg\u00f6ra anv\u00e4ndning av ett enda verktyg f\u00f6r b\u00e5de kompilering av Linux-k\u00e4rnan och f\u00f6r att kompilera program f\u00f6r eBPF. <\/p>\n

F\u00f6rutom backenden f\u00f6r generering av bytekod inkluderar de patchar som f\u00f6resl\u00e5s f\u00f6r GCC \u00e4ven en port av libgcc f\u00f6r eBPF och verktyg f\u00f6r att skapa ELF-filer, vilket g\u00f6r det m\u00f6jligt att k\u00f6ra kod i den virtuella eBPF-maskinen med hj\u00e4lp av k\u00e4rnans tillhandah\u00e5llande laddare. Just nu kan endast kod p\u00e5 C \u00f6vers\u00e4ttas till bytekod (inte alla spr\u00e5kets m\u00f6jligheter \u00e4r tillg\u00e4ngliga), men i framtiden f\u00f6rv\u00e4ntas en utvidgning av de tillg\u00e4ngliga funktionsm\u00f6jligheterna i C, st\u00f6d f\u00f6r andra spr\u00e5k, skapande av en simulator och till\u00e4gg av st\u00f6d f\u00f6r GCC f\u00f6r fels\u00f6kning av eBPF-program utan att ladda dem i k\u00e4rnan.<\/p>\n

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

K\u00e4lla: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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