• jarin@chromium.org's avatar
    Support for the Linux 'perf report' and 'perf annotate' tools. · 4e439deb
    jarin@chromium.org authored
    In this change, the support comes in two flavours:
    
    --perf_jit_prof - outputs the files in a new perf format that only works with a
    patched perf tool (patch obtained from Stephane Eranian). Both 'perf report' and
    'perf annotate' are supported (the file format also contains the machine code).
    
    --perf_basic_prof - outputs the files in a format that the existing perf tool
    can consume. Only 'perf report' is supported.
    
    In both cases, we have to disable code compaction because the perf tool does not
    understand code relocation. (We are told that code relocation should be
    supported soon.)
    
    Usage:
    
    perf record -g d8 --perf_jit_prof --no_compact_code_space my.js
    perf report
    
    The change itself is straightforward - we simply listen to code events and
    write an entry to a log file for every new piece of code.
    
    I am not yet sure whether we should keep both versions or just one (and which
    one). My hope is the reviewers can help here.
    
    R=danno@chromium.org
    BUG=
    
    Review URL: https://codereview.chromium.org/70013002
    
    git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18034 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
    4e439deb
log.h 21.2 KB