Commit c294d95d authored by Committed by Duncan Coutts
Add the GC_GLOBAL_SYNC event marking that all caps are stopped for GC
Quoting design rationale by dcoutts: The event indicates that we're doing a stop-the-world GC and all other HECs should be between their GC_START and GC_END events at that moment. We don't want to use GC_STATS_GHC for that, because GC_STATS_GHC is for extra GHC-specific info, not something we have to rely on to be able to match the GC pauses across HECs to a particular global GC.
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