{"id":115001,"date":"2024-04-12T02:30:02","date_gmt":"2024-04-12T00:30:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kompaniya-oracle-opublikovala-dtrace-dlya-linux-2-0-0-1-14"},"modified":"2024-04-12T02:30:02","modified_gmt":"2024-04-12T00:30:02","slug":"kompaniya-oracle-opublikovala-dtrace-dlya-linux-2-0-0-1-14","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/kompaniya-oracle-opublikovala-dtrace-dlya-linux-2-0-0-1-14","title":{"rendered":"Firma Oracle opublikowa\u0142a DTrace dla Linuksa 2.0.0-1.14","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Zosta\u0142o wprowadzone eksperymentalne wydanie narz\u0119dzia do dynamicznego debugowania DTrace dla Linux 2.0.0-1.14, zrealizowane w postaci procesu dzia\u0142aj\u0105cego w przestrzeni u\u017cytkownika, wykorzystuj\u0105cego podsystem eBPF oraz wbudowane mechanizmy \u015bledzenia udost\u0119pniane przez j\u0105dro Linux. Funkcjonalnie wdro\u017cenie DTrace oparte na eBPF jest zbli\u017cone do pierwszej wersji DTrace dla Linux, zrealizowanej w formie modu\u0142u j\u0105dra. Kod projektu jest udost\u0119pniany na licencji GPLv2.     <\/p>\n<p>Narz\u0119dzie mo\u017ce by\u0107 u\u017cywane z domy\u015blnymi j\u0105drami Linux obs\u0142uguj\u0105cymi BPF. Do dzia\u0142ania wymagana jest biblioteka libctf z implementacj\u0105 wsparcia dla formatu debugowania CTF (Compact Type Format), kt\u00f3ra wchodzi w sk\u0142ad pakietu binutils, pocz\u0105wszy od wydania 2.40, lub biblioteka libdtrace-ctf, przeniesiona z systemu Solaris. Dodatkowo oferowane s\u0105 dwa patche do j\u0105dra 6.7, kt\u00f3re umo\u017cliwiaj\u0105 wykorzystanie rozszerzonych mo\u017cliwo\u015bci do pozyskiwania dodatkowych danych o modu\u0142ach i j\u0105drze.    <\/p>\n<p>Technologia DTrace zosta\u0142a opracowana w celu rozwi\u0105zania problem\u00f3w zwi\u0105zanych z dynamicznym \u015bledzeniem j\u0105dra i ko\u0144cowych aplikacji w systemie operacyjnym Solaris. DTrace daje u\u017cytkownikowi mo\u017cliwo\u015b\u0107 szczeg\u00f3\u0142owego \u015bledzenia zachowania systemu i diagnozowania problem\u00f3w w czasie rzeczywistym. W trakcie debugowania DTrace nie wp\u0142ywa na dzia\u0142anie badanych aplikacji i nie odbija si\u0119 na ich wydajno\u015bci, co pozwala na analiz\u0119 dzia\u0142aj\u0105cych system\u00f3w w locie. W\u015br\u00f3d mocnych stron DTrace wymienia si\u0119 wysokopoziomowy j\u0119zyk D, podobny do AWK, na kt\u00f3rym znacznie \u0142atwiej jest tworzy\u0107 skrypty \u015bledz\u0105ce w por\u00f3wnaniu do dost\u0119pnych dla eBPF narz\u0119dzi do pisania handler\u00f3w w j\u0119zykach C, Python i Lua z zewn\u0119trznymi bibliotekami.     <\/p>\n<p>Podstawowe funkcje:  <\/p>\n<ul>\n<li class=\"l\"> Dost\u0119pne dostawcy:\n<ul>\n<li class=\"l\"> cpc (CPU Performacne Counter) &#8212; \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u0435 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438.\n<li class=\"l\"> dtrace &#8212; \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 BEGIN, END \u0438 ERROR, \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c\u044b\u0435 \u043f\u0435\u0440\u0435\u0434 \u0438\u043b\u0438 \u043f\u043e\u0441\u043b\u0435 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u0440\u043e\u0432\u0435\u0440\u043e\u043a, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u0438 \u043e\u0448\u0438\u0431\u043e\u043a.\n<li class=\"l\"> fbt  (Function Boundary Tracing) &#8212; \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u0435 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0439 \u043a \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c \u044f\u0434\u0440\u0430.\n<li class=\"l\"> lockstat &#8212; \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u0435 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u044f \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043e\u043a.\n<li class=\"l\"> pid &#8212; \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u0435 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0439 \u043a \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u0445, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0445 \u0432 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f.\n<li class=\"l\"> proc &#8212; \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u0435 \u0430\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u043e\u0439 \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c\u0438, \u0442\u0430\u043a\u043e\u0439 \u043a\u0430\u043a \u0437\u0430\u043f\u0443\u0441\u043a \u0438 \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u0435 \u0440\u0430\u0431\u043e\u0442\u044b (fork, exec, exit, fault).\n<li class=\"l\"> profile &#8212;  \u0441\u043e\u0445\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438 \u043e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0447\u0435\u0440\u0435\u0437 \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043a\u0438 \u0432\u0440\u0435\u043c\u0435\u043d\u0438.\n<li class=\"l\"> sdt, rawtp  &#8212; \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0442\u0440\u0430\u0441\u0441\u0438\u0440\u043e\u0432\u043a\u0430 \u044f\u0434\u0440\u0430  (SDT &#8212; Statically Defined Tracing).\n<li class=\"l\"> usdt: \u0441\u0442\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0442\u0440\u0430\u0441\u0441\u0438\u0440\u043e\u0432\u043a\u0430 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 (USDT &#8212; Userspace Statically Defined Tracing)\n<li class=\"l\"> sched &#8212; \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u0435 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 CPU.\n<li class=\"l\"> sycall &#8212; \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u0435 \u0432\u0445\u043e\u0434\u0430  \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0435 \u0432\u044b\u0437\u043e\u0432\u044b \u0438 \u0432\u044b\u0445\u043e\u0434\u0430 \u0438\u0437 \u043d\u0438\u0445.    <\/ul>\n<li class=\"l\"> Agregacja zbieranych danych: mo\u017cliwo\u015b\u0107 zastosowania funkcji agreguj\u0105cych (avg, count, llquantize, lquantize, max, min, quantize, stddev i sum) oraz dzia\u0142a\u0144 agreguj\u0105cych (clear, normalize, printa). Wsparcie dla zapisywania wynik\u00f3w zastosowania funkcji agreguj\u0105cych w tablicach zwyk\u0142ych i asocjacyjnych.\n<li class=\"l\"> Wsparcie dla spekulacyjnego \u015bledzenia, umo\u017cliwiaj\u0105cego efemeryczne \u015bledzenie danych, decyduj\u0105c, kt\u00f3re z nich powinny by\u0107 zapisywane w buforze \u015bledzenia, a kt\u00f3re odrzucane. Dost\u0119pne funkcje: speculation, speculate, commit i discard.\n<li class=\"l\"> Wsparcie dla zmiennych globalnych i lokalnych, TLS (Thread-Local Storage), tablic asocjacyjnych i ci\u0105g\u00f3w.\n<li class=\"l\"> \u041f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0445 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445: arg0 &#8212; arg9, args[], caller, curcpu, curthread, epid, errno,          execname, gid, id, pid, ppid, probefunc, probemod, probename,          probeprov, stackdepth, tid, timestamp, ucaller, uid, uregs[],          ustackdepth, walltimestamp.\n<li class=\"l\"> Wsparcie dla dzia\u0142a\u0144: exit, freopen, ftruncate, mod, printa, printf, raise, setopt, stack, sym, system, trace, tracemem, uaddr, umod, ustack i usym.\n<li class=\"l\"> Obecno\u015b\u0107 wbudowanych funkcji: alloca, basename, bcopy, copyin, copyinstr, copyinto, copyout, copyoutstr, dirname, getmajor, getminor, htonl, htonll, htons, index, inet_ntoa, lltostr, mutex_owned, mutex_owner, mutex_type_adaptive, mutex_type_spin, ntohl, ntohll, ntohs, progenyof, rand, rindex, rw_iswriter, rw_read_held, rw_write_held, strchr, strjoin, strlen, strrchr, strstr, strtok, substr.\n<li class=\"l\"> Obecno\u015b\u0107 licznik\u00f3w danych, kt\u00f3re nie trafiaj\u0105 do bufor\u00f3w \u015bledzenia.\n<li class=\"l\"> Wsparcie dla kompilacji skrypt\u00f3w \u015bledzenia w j\u0119zyku D do formy program\u00f3w BPF.\n<li class=\"l\"> Przedkompilacja funkcji BPF dla wywo\u0142a\u0144 bibliotecznych.\n<li class=\"l\"> Opcja bpflog dla uzyskania logu walidacji za\u0142adowanych program\u00f3w BPF.\n<li class=\"l\"> Dynamiczne generowanie kodu i przedkompilacja kodu do ponownego wykorzystania w programach BPF.    <\/ul>\n<p>Zmiany w nowej wersji:  <\/p>\n<ul>\n<li class=\"l\"> W dostawcy pid, stosowanym do \u015bledzenia proces\u00f3w w przestrzeni u\u017cytkownika, dodano wsparcie dla \u015bledzenia wykonania instrukcji poprzez ich przesuni\u0119cie w kodzie.\n<li class=\"l\"> Dodano wsparcie dla u\u017cycia funkcji stack() i ustack() do agregacji zbieranych danych.\n<li class=\"l\"> Mo\u017cliwo\u015b\u0107 usuwania z tablic asocjacyjnych element\u00f3w dowolnych typ\u00f3w poprzez przypisanie litera\u0142u 0.\n<li class=\"l\"> Dodano dzia\u0142anie print do wy\u015bwietlania strukturalnych danych z adnotacjami typu.\n<li class=\"l\"> Dodano nowe wbudowane funkcje cleanpath(), d_path() i link_ntop().\n<li class=\"l\"> \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 &#171;-xcpu&#187;, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043f\u0440\u0438\u0432\u044f\u0437\u0430\u0442\u044c \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043a \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u043c CPU.\n<li class=\"l\"> \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 &#171;-xlockmem&#187; \u0434\u043b\u044f \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u043f\u0430\u043c\u044f\u0442\u0438.\n<li class=\"l\"> Zapewniono mo\u017cliwo\u015b\u0107 przechowywania danych \u015bledzenia proces\u00f3w (USDT) pomi\u0119dzy ponownymi uruchomieniami dtprobed.\n<li class=\"l\"> Wsparcie dla mechanizmu BTF (BPF Type Format), dostarczaj\u0105cego informacji do weryfikacji typ\u00f3w w pseudokodzie BPF.\n<li class=\"l\"> Mo\u017cliwo\u015b\u0107 u\u017cywania skryptu configure do kompilacji.  <\/ul>\n<p>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60973\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043e\u0442\u043b\u0430\u0434\u043a\u0438 DTrace \u0434\u043b\u044f Linux 2.0.0-1.14, \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u0432 \u0432\u0438\u0434\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0435\u0433\u043e \u0432 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0435\u0433\u043e \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0443 eBPF \u0438 \u0448\u0442\u0430\u0442\u043d\u044b\u0435 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u044b \u0442\u0440\u0430\u0441\u0441\u0438\u0440\u043e\u0432\u043a\u0438, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u044b\u0445 \u044f\u0434\u0440\u043e\u043c Linux. \u041f\u043e \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f DTrace \u043d\u0430 \u0431\u0430\u0437\u0435 eBPF \u0431\u043b\u0438\u0437\u043a\u0430 \u043a \u043f\u0435\u0440\u0432\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 DTrace \u0434\u043b\u044f Linux, \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u043e\u0439 \u0432 \u0444\u043e\u0440\u043c\u0435 \u043c\u043e\u0434\u0443\u043b\u044f \u044f\u0434\u0440\u0430. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 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