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6966222: G1: simplify TaskQueue overflow handling

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Reviewed-by: tonyp, ysr
This commit is contained in:
John Coomes 2010-08-09 05:41:05 -07:00
parent f8eed77f36
commit 7fe1c05c7c
5 changed files with 127 additions and 90 deletions
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31
hotspot/src/share/vm/utilities/taskqueue.cpp
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@ -36,6 +36,14 @@ const char * const TaskQueueStats::_names[last_stat_id] = {
"qpush", "qpop", "qpop-s", "qattempt", "qsteal", "opush", "omax"
};
TaskQueueStats & TaskQueueStats::operator +=(const TaskQueueStats & addend)
{
for (unsigned int i = 0; i < last_stat_id; ++i) {
_stats[i] += addend._stats[i];
}
return *this;
}
void TaskQueueStats::print_header(unsigned int line, outputStream* const stream,
unsigned int width)
{
@ -71,6 +79,29 @@ void TaskQueueStats::print(outputStream* stream, unsigned int width) const
}
#undef FMT
}
#ifdef ASSERT
// Invariants which should hold after a TaskQueue has been emptied and is
// quiescent; they do not hold at arbitrary times.
void TaskQueueStats::verify() const
{
assert(get(push) == get(pop) + get(steal),
err_msg("push=" SIZE_FORMAT " pop=" SIZE_FORMAT " steal=" SIZE_FORMAT,
get(push), get(pop), get(steal)));
assert(get(pop_slow) <= get(pop),
err_msg("pop_slow=" SIZE_FORMAT " pop=" SIZE_FORMAT,
get(pop_slow), get(pop)));
assert(get(steal) <= get(steal_attempt),
err_msg("steal=" SIZE_FORMAT " steal_attempt=" SIZE_FORMAT,
get(steal), get(steal_attempt)));
assert(get(overflow) == 0 || get(push) != 0,
err_msg("overflow=" SIZE_FORMAT " push=" SIZE_FORMAT,
get(overflow), get(push)));
assert(get(overflow_max_len) == 0 || get(overflow) != 0,
err_msg("overflow_max_len=" SIZE_FORMAT " overflow=" SIZE_FORMAT,
get(overflow_max_len), get(overflow)));
}
#endif // ASSERT
#endif // TASKQUEUE_STATS
int TaskQueueSetSuper::randomParkAndMiller(int *seed0) {