Rewriting byte codes
abies at pg.gda.pl
Mon Apr 1 16:48:36 PST 2002
Erik Corry wrote:
>>AFAIK, hotspot stops thread, replaces closest safe points with some trap
>>and let thread run until it hit one. Then it restores original
>>instruction and voila.
> This sounds pretty ugly to me, since it involves lots of writing
> to the instruction stream with corresponding I-cache flushes etc.
I think that I-cache flush penalty is neglible compared to cost of
switching threads few times and performing gc. We are talking about
extra 20-50 cycles and gc will take about 1ms minimum (which gives about
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