1. 22 9月, 2017 1 次提交
    • A
      perf tools: Provide mutex wrappers for pthreads rwlocks · 0a7c74ea
      Arnaldo Carvalho de Melo 提交于
      Andi reported a performance drop in single threaded perf tools such as
      'perf script' due to the growing number of locks being put in place to
      allow for multithreaded tools, so wrap the POSIX threads rwlock routines
      with the names used for such kinds of locks in the Linux kernel and then
      allow for tools to ask for those locks to be used or not.
      
      I.e. a tool may have a multithreaded phase and then switch to single
      threaded, like the upcoming patches for the synthesizing of
      PERF_RECORD_{FORK,MMAP,etc} for pre-existing processes to then switch to
      single threaded mode in 'perf top'.
      
      The init routines will not be conditional, this way starting as single
      threaded to then move to multi threaded mode should be possible.
      Reported-by: NAndi Kleen <ak@linux.intel.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Kan Liang <kan.liang@intel.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/r/20170404161739.GH12903@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      0a7c74ea
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