RFR(S): 8007701: Hotspot JFR Allocation Events
nils.eliasson at oracle.com
Thu Mar 14 13:42:40 PDT 2013
I would like a review for this change that introduces two new Java
Flight Recorder events.
"AllocationInNewTLAB" is sent for the first object in a new TLAB and
gives a reasonably cheap and reasonably fair object sampling.
"AllocationOutsideTLAB" is sent for each object that gets allocated
outside the TLABs. (The object doesn't fit or would cause too much
wasted free space if the tlab was discarded.)
These events use the allocation slow path in CollectedHeap which is used
by default in the template interpreter and the C2 compiler. It is also
used for all TLAB refills in the C1-compiler if the flag
-XX:-FastTLABRefill is supplied.
The event code for AllocationOutsideTLAB had to be put in
CollectedHeap.cpp since tracing.hpp can't be included into
More information about the hotspot-gc-dev