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From Apache Wiki <wikidi...@apache.org>
Subject [Harmony Wiki] Update of "Jitrino OPT/bbp" by George Timoshenko
Date Tue, 06 May 2008 08:32:56 GMT
Dear Wiki user,

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The following page has been changed by George Timoshenko:

New page:
Back-Branch Polling is for yield points insertion at back branches of certain kinds of loops
to enable safe thread suspension. Several approaches are implemented there:

    //  0 - the feature is turned off
    //  1 - insert interruptable subgraph at all backedges except those going from initiallyInterruptable
    //      (initialInterruptability is not being propagated to the successors. This is the
feature of version 5)
    //  2 - path analysis based on searching of pairs [isOnThreadInterruptablePath]->[!isOnThreadInterruptablePath]
    //  3 - recursive version of "2"
    //  4 - "1" + suspension flag addr [TLS base + offset] is calculated before the loop header
    //  5 - like "1" but some backedges are not patched (if all paths through it are uninteruptable)
    //  6 - "4" + "5"

They can be switched using the following:

- XX:jit.arg.bbp=[0-6]

Possible improvement

It may have sence BBPolling is worth to be done earlier - in HLO.
To clarify one need to implemet HLO pass for this and find the best position (from the performance
POV) for it in the HLO path.

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