Red Hat Training

A Red Hat training course is available for Red Hat Enterprise Linux

6. 工​​​​​​​​​​​​​​​具​​​​​​​​​​​​​​​更​​​​​​​​​​​​​​​新​​​​​​​​​​​​​​​

重要

All the IBM Java components are available online due to a late detection of missing COPYRIGHT notice. This applies to the Supplementary CD contents for Red Hat Enterprise Linux 5 on all architectures and releases. For more information, see the Red Hat Knowledgebase.
  • SystemTap is now fully supported, and has been re-based to the latest upstream version. This update features improved user-space probing through shared libraries, experimental DWARF unwinding, and a new <sys/sdt.h> header file which provides dtrace-compatible markers.
    This re-base also enhances support for debuginfo-less operations. Typecasting (through the @cast operator) is now supported, along with kernel tracepoint probing. Several 'kprobe.*' probe bugs that hampered debuginfo-less operations are also now resolved.
    SystemTap also features several documentation improvements. A new '3stap' feature provides users with useful man pages on most SystemTap probes and functions. The systemtap-testsuite package also features a larger library of sample scripts.
    有​​​​​​​​​​​​​​​关​​​​​​​​​​​​​​​ SystemTap 复​​​​​​​​​​​​​​​位​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​详​​​​​​​​​​​​​​​情​​​​​​​​​​​​​​​请​​​​​​​​​​​​​​​参​​​​​​​​​​​​​​​考​​​​​​​​​​​​​​​技​​​​​​​​​​​​​​​术​​​​​​​​​​​​​​​备​​​​​​​​​​​​​​​注​​​​​​​​​​​​​​​中​​​​​​​​​​​​​​​软​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​包​​​​​​​​​​​​​​​更​​​​​​​​​​​​​​​新​​​​​​​​​​​​​​​一​​​​​​​​​​​​​​​章​​​​​​​​​​​​​​​中​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​ SystemTap 部​​​​​​​​​​​​​​​分​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​
  • Systemtap 跟​​​​​​​​​​​​​​​踪​​​​​​​​​​​​​​​点​​​​​​​​​​​​​​​位​​​​​​​​​​​​​​​于​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​核​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​重​​​​​​​​​​​​​​​要​​​​​​​​​​​​​​​部​​​​​​​​​​​​​​​分​​​​​​​​​​​​​​​，允​​​​​​​​​​​​​​​许​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​管​​​​​​​​​​​​​​​理​​​​​​​​​​​​​​​员​​​​​​​​​​​​​​​分​​​​​​​​​​​​​​​析​​​​​​​​​​​​​​​性​​​​​​​​​​​​​​​能​​​​​​​​​​​​​​​并​​​​​​​​​​​​​​​调​​​​​​​​​​​​​​​试​​​​​​​​​​​​​​​代​​​​​​​​​​​​​​​码​​​​​​​​​​​​​​​部​​​​​​​​​​​​​​​分​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​红​​​​​​​​​​​​​​​帽​​​​​​​​​​​​​​​企​​​​​​​​​​​​​​​业​​​​​​​​​​​​​​​版​​​​​​​​​​​​​​​ Linux 5.4 中​​​​​​​​​​​​​​​，已​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​核​​​​​​​​​​​​​​​子​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​以​​​​​​​​​​​​​​​下​​​​​​​​​​​​​​​部​​​​​​​​​​​​​​​分​​​​​​​​​​​​​​​添​​​​​​​​​​​​​​​加​​​​​​​​​​​​​​​了​​​​​​​​​​​​​​​跟​​​​​​​​​​​​​​​踪​​​​​​​​​​​​​​​点​​​​​​​​​​​​​​​作​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​技​​​​​​​​​​​​​​​术​​​​​​​​​​​​​​​预​​​​​​​​​​​​​​​览​​​​​​​​​​​​​​​：
    • 内​​​​​​​​​​​​​​​存​​​​​​​​​​​​​​​管​​​​​​​​​​​​​​​理​​​​​​​​​​​​​​​（mm）(BZ#493444)
    • 块​​​​​​​​​​​​​​​设​​​​​​​​​​​​​​​备​​​​​​​​​​​​​​​ I/O（blktrace）(Bugzilla #493454)
    • 网​​​​​​​​​​​​​​​络​​​​​​​​​​​​​​​文​​​​​​​​​​​​​​​件​​​​​​​​​​​​​​​系​​​​​​​​​​​​​​​统​​​​​​​​​​​​​​​（NFS）(BZ#499008)
    • 页​​​​​​​​​​​​​​​缓​​​​​​​​​​​​​​​冲​​​​​​​​​​​​​​​及​​​​​​​​​​​​​​​联​​​​​​​​​​​​​​​网​​​​​​​​​​​​​​​栈​​​​​​​​​​​​​​​ (BZ#475719)
    • 调​​​​​​​​​​​​​​​度​​​​​​​​​​​​​​​程​​​​​​​​​​​​​​​序​​​​​​​​​​​​​​​ (BZ#497414)
  • 现​​​​​​​​​​​​​​​将​​​​​​​​​​​​​​​ Gnu 编​​​​​​​​​​​​​​​译​​​​​​​​​​​​​​​程​​​​​​​​​​​​​​​序​​​​​​​​​​​​​​​集​​​​​​​​​​​​​​​合​​​​​​​​​​​​​​​版​​​​​​​​​​​​​​​本​​​​​​​​​​​​​​​ 4.4（GCC4.4）包​​​​​​​​​​​​​​​含​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​此​​​​​​​​​​​​​​​发​​​​​​​​​​​​​​​行​​​​​​​​​​​​​​​本​​​​​​​​​​​​​​​中​​​​​​​​​​​​​​​作​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​技​​​​​​​​​​​​​​​术​​​​​​​​​​​​​​​预​​​​​​​​​​​​​​​览​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​这​​​​​​​​​​​​​​​个​​​​​​​​​​​​​​​编​​​​​​​​​​​​​​​译​​​​​​​​​​​​​​​程​​​​​​​​​​​​​​​序​​​​​​​​​​​​​​​集​​​​​​​​​​​​​​​合​​​​​​​​​​​​​​​包​​​​​​​​​​​​​​​括​​​​​​​​​​​​​​​ C、​​​​​​​​​​​​​​​C++ 和​​​​​​​​​​​​​​​ Fortran 编​​​​​​​​​​​​​​​译​​​​​​​​​​​​​​​程​​​​​​​​​​​​​​​序​​​​​​​​​​​​​​​及​​​​​​​​​​​​​​​其​​​​​​​​​​​​​​​支​​​​​​​​​​​​​​​持​​​​​​​​​​​​​​​程​​​​​​​​​​​​​​​序​​​​​​​​​​​​​​​库​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​
  • glibc new MALLOC behaviour：最​​​​​​​​​​​​​​​近​​​​​​​​​​​​​​​更​​​​​​​​​​​​​​​改​​​​​​​​​​​​​​​了​​​​​​​​​​​​​​​上​​​​​​​​​​​​​​​游​​​​​​​​​​​​​​​ glibc 以​​​​​​​​​​​​​​​便​​​​​​​​​​​​​​​启​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​跨​​​​​​​​​​​​​​​很​​​​​​​​​​​​​​​多​​​​​​​​​​​​​​​套​​​​​​​​​​​​​​​接​​​​​​​​​​​​​​​字​​​​​​​​​​​​​​​及​​​​​​​​​​​​​​​核​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​更​​​​​​​​​​​​​​​高​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​灵​​​​​​​​​​​​​​​活​​​​​​​​​​​​​​​性​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​通​​​​​​​​​​​​​​​过​​​​​​​​​​​​​​​分​​​​​​​​​​​​​​​配​​​​​​​​​​​​​​​其​​​​​​​​​​​​​​​自​​​​​​​​​​​​​​​身​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​存​​​​​​​​​​​​​​​池​​​​​​​​​​​​​​​线​​​​​​​​​​​​​​​程​​​​​​​​​​​​​​​可​​​​​​​​​​​​​​​做​​​​​​​​​​​​​​​到​​​​​​​​​​​​​​​这​​​​​​​​​​​​​​​一​​​​​​​​​​​​​​​点​​​​​​​​​​​​​​​并​​​​​​​​​​​​​​​可​​​​​​​​​​​​​​​避​​​​​​​​​​​​​​​免​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​有​​​​​​​​​​​​​​​些​​​​​​​​​​​​​​​情​​​​​​​​​​​​​​​况​​​​​​​​​​​​​​​下​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​锁​​​​​​​​​​​​​​​定​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​于​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​存​​​​​​​​​​​​​​​池​​​​​​​​​​​​​​​（如​​​​​​​​​​​​​​​果​​​​​​​​​​​​​​​有​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​话​​​​​​​​​​​​​​​）的​​​​​​​​​​​​​​​额​​​​​​​​​​​​​​​外​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​存​​​​​​​​​​​​​​​量​​​​​​​​​​​​​​​可​​​​​​​​​​​​​​​使​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​环​​​​​​​​​​​​​​​境​​​​​​​​​​​​​​​变​​​​​​​​​​​​​​​量​​​​​​​​​​​​​​​ MALLOC_ARENA_TEST 和​​​​​​​​​​​​​​​ MALLOC_ARENA_MAX 进​​​​​​​​​​​​​​​行​​​​​​​​​​​​​​​控​​​​​​​​​​​​​​​制​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​
    MALLOC_ARENA_TEST 指​​​​​​​​​​​​​​​定​​​​​​​​​​​​​​​一​​​​​​​​​​​​​​​旦​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​存​​​​​​​​​​​​​​​池​​​​​​​​​​​​​​​达​​​​​​​​​​​​​​​到​​​​​​​​​​​​​​​此​​​​​​​​​​​​​​​数​​​​​​​​​​​​​​​值​​​​​​​​​​​​​​​执​​​​​​​​​​​​​​​行​​​​​​​​​​​​​​​测​​​​​​​​​​​​​​​试​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​核​​​​​​​​​​​​​​​数​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​MALLOC_ARENA_MAX 设​​​​​​​​​​​​​​​定​​​​​​​​​​​​​​​使​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​存​​​​​​​​​​​​​​​池​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​最​​​​​​​​​​​​​​​大​​​​​​​​​​​​​​​数​​​​​​​​​​​​​​​目​​​​​​​​​​​​​​​，不​​​​​​​​​​​​​​​考​​​​​​​​​​​​​​​虑​​​​​​​​​​​​​​​核​​​​​​​​​​​​​​​数​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​
    在​​​​​​​​​​​​​​​ RHEL 5.4 中​​​​​​​​​​​​​​​整​​​​​​​​​​​​​​​合​​​​​​​​​​​​​​​了​​​​​​​​​​​​​​​ glibc 功​​​​​​​​​​​​​​​能​​​​​​​​​​​​​​​作​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​上​​​​​​​​​​​​​​​游​​​​​​​​​​​​​​​ malloc 的​​​​​​​​​​​​​​​技​​​​​​​​​​​​​​​术​​​​​​​​​​​​​​​预​​​​​​​​​​​​​​​览​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​要​​​​​​​​​​​​​​​启​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​每​​​​​​​​​​​​​​​个​​​​​​​​​​​​​​​线​​​​​​​​​​​​​​​程​​​​​​​​​​​​​​​内​​​​​​​​​​​​​​​存​​​​​​​​​​​​​​​池​​​​​​​​​​​​​​​，需​​​​​​​​​​​​​​​要​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​环​​​​​​​​​​​​​​​境​​​​​​​​​​​​​​​中​​​​​​​​​​​​​​​设​​​​​​​​​​​​​​​定​​​​​​​​​​​​​​​环​​​​​​​​​​​​​​​境​​​​​​​​​​​​​​​变​​​​​​​​​​​​​​​量​​​​​​​​​​​​​​​ MALLOC_PER_THREAD。​​​​​​​​​​​​​​​当​​​​​​​​​​​​​​​在​​​​​​​​​​​​​​​今​​​​​​​​​​​​​​​后​​​​​​​​​​​​​​​发​​​​​​​​​​​​​​​行​​​​​​​​​​​​​​​本​​​​​​​​​​​​​​​中​​​​​​​​​​​​​​​这​​​​​​​​​​​​​​​个​​​​​​​​​​​​​​​新​​​​​​​​​​​​​​​ malloc 行​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​成​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​默​​​​​​​​​​​​​​​认​​​​​​​​​​​​​​​行​​​​​​​​​​​​​​​为​​​​​​​​​​​​​​​时​​​​​​​​​​​​​​​，将​​​​​​​​​​​​​​​废​​​​​​​​​​​​​​​除​​​​​​​​​​​​​​​环​​​​​​​​​​​​​​​境​​​​​​​​​​​​​​​变​​​​​​​​​​​​​​​量​​​​​​​​​​​​​​​ MALLOC_PER_THREAD。​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​户​​​​​​​​​​​​​​​如​​​​​​​​​​​​​​​果​​​​​​​​​​​​​​​遇​​​​​​​​​​​​​​​到​​​​​​​​​​​​​​​ malloc 资​​​​​​​​​​​​​​​源​​​​​​​​​​​​​​​竞​​​​​​​​​​​​​​​争​​​​​​​​​​​​​​​的​​​​​​​​​​​​​​​情​​​​​​​​​​​​​​​况​​​​​​​​​​​​​​​，则​​​​​​​​​​​​​​​可​​​​​​​​​​​​​​​以​​​​​​​​​​​​​​​尝​​​​​​​​​​​​​​​试​​​​​​​​​​​​​​​启​​​​​​​​​​​​​​​用​​​​​​​​​​​​​​​这​​​​​​​​​​​​​​​个​​​​​​​​​​​​​​​选​​​​​​​​​​​​​​​项​​​​​​​​​​​​​​​。​​​​​​​​​​​​​​​