• Mythri A's avatar
    [turboprop] Delay optimizing functions that get hot slower · 502419a8
    Mythri A authored
    Functions that get hot quickly are more likely to stay hot and stable,
    so optimize these functions earlier than the function that become
    hot slower. To measure how "soon" the function gets hot this cl
    introduces a global tick that is incremented whenever a function
    registers a tick. We use the difference in the global tick between the
    current tick and the last tick on that function to measure how soon
    the function is becoming hot. We use the last tick to account for
    functions that aren't used so much at the start but become hot
    in a later phase. Currently we use this heuristic only for Turboprop
    tierups. It is possible to extend this to extend this to Turbofan in
    future.
    
    Bug: v8:9684
    Change-Id: I8ef265c03520274c68d56a9d35429531a3ba3d1d
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2627850
    Commit-Queue: Mythri Alle <mythria@chromium.org>
    Reviewed-by: 's avatarRoss McIlroy <rmcilroy@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#72281}
    502419a8
feedback-vector.h 31 KB