bool TenuredGeneration::promotion_attempt_is_safe(
size_t max_promotion_in_bytes,
bool younger_handles_promotion_failure) const {
bool result = max_contiguous_available() >= max_promotion_in_bytes;
if (younger_handles_promotion_failure && !result) {
result = max_contiguous_available() >=
(size_t) gc_stats()->avg_promoted()->padded_average();
if (PrintGC && Verbose && result) {
gclog_or_tty->print_cr("TenuredGeneration::promotion_attempt_is_safe"
" contiguous_available: " SIZE_FORMAT
" avg_promoted: " SIZE_FORMAT,
max_contiguous_available(),
gc_stats()->avg_promoted()->padded_average());
}
} else {
if (PrintGC && Verbose) {
gclog_or_tty->print_cr("TenuredGeneration::promotion_attempt_is_safe"
" contiguous_available: " SIZE_FORMAT
" promotion_in_bytes: " SIZE_FORMAT,
max_contiguous_available(), max_promotion_in_bytes);
}
}
return result;
}
bool TenuredGeneration::promotion_attempt_is_safe(size_t max_promotion_in_bytes) const {
size_t available = max_contiguous_available();
size_t av_promo = (size_t)gc_stats()->avg_promoted()->padded_average();
bool res = (available >= av_promo) || (available >= max_promotion_in_bytes);
if (PrintGC && Verbose) {
gclog_or_tty->print_cr(
"Tenured: promo attempt is%s safe: available("SIZE_FORMAT") %s av_promo("SIZE_FORMAT"),"
"max_promo("SIZE_FORMAT")",
res? "":" not", available, res? ">=":"<",
av_promo, max_promotion_in_bytes);
}
return res;
}
void TenuredGeneration::update_gc_stats(int current_level,
bool full) {
// If the next lower level(s) has been collected, gather any statistics
// that are of interest at this point.
if (!full && (current_level + 1) == level()) {
// Calculate size of data promoted from the younger generations
// before doing the collection.
size_t used_before_gc = used();
// If the younger gen collections were skipped, then the
// number of promoted bytes will be 0 and adding it to the
// average will incorrectly lessen the average. It is, however,
// also possible that no promotion was needed.
if (used_before_gc >= _used_at_prologue) {
size_t promoted_in_bytes = used_before_gc - _used_at_prologue;
gc_stats()->avg_promoted()->sample(promoted_in_bytes);
}
}
}