Safepointing in HotSpot

[Ahmed Khawaja]

Greetings,

             I am looking into when HotSpot decides to insert code for 
safepointing. My goal is to understand the decision process of when a 
safepoint is inserted and also to relay to an analysis tool that a 
certain instruction was inserted due to safepointing. I am looking into 
what criteria merit the insertion of a safepoint and how code can be 
optimized to avoid that. Can anyone point me in the direction of the 
source code in HotSpot responsible for this? I am able to identify 
manually the code sequences that result in a safepoint and realize they 
must be inserted somewhere before code motion is applied since they 
don't always show up as contiguous instructions.

Thank you,
    Ahemd Khawaja