• vitalyr@chromium.org's avatar
    Suspend runtime profiler as soon as we exit JS. · 90c9f1b9
    vitalyr@chromium.org authored
    Lots of web pages have really frequently firing timers that keep the
    profiler thread spinning if we require a period of JS inactivity
    before suspending the profiler. While it's possible to throttle it by
    increasing the sleep delay and adjusting the duration of the required
    inactive period, it seemed much simpler to just stop it immediately on
    exiting JS.
    
    Stopping the profiler this way effectively turned off two optimization
    heuristics: 1) eager optimization (it's reset on waking up the
    profiler and now the profiler wakes up much more frequently) and 2)
    optimization throttling based on JS to non-JS state ratio (the ratio
    is now 100%). I removed these two heuristics and found no performance
    regressions so far.
    
    R=ager@chromium.org
    BUG=crbug.com/77625
    TEST=none
    
    Review URL: http://codereview.chromium.org/7274024
    
    git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8472 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
    90c9f1b9
compilation-cache.cc 15.7 KB