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6521376: MaxTenuringThreshold and AlwayTenure/NeverTenure consistency

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Adapt InitialTenuringThreshold and MaxTenuringThreshold according to AlwaysTenure/NeverTenure flag setting.

Reviewed-by: jmasa, tschatzl
This commit is contained in:
Tao Mao 2014-03-26 12:49:34 +01:00
parent 547e8e4b75
commit 7a39c2c7d5
6 changed files with 313 additions and 35 deletions
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37
hotspot/src/share/vm/gc_implementation/shared/ageTable.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -80,28 +80,37 @@ void ageTable::merge_par(ageTable* subTable) {
uint ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
size_t total = 0;
uint age = 1;
assert(sizes[0] == 0, "no objects with age zero should be recorded");
while (age < table_size) {
total += sizes[age];
// check if including objects of age 'age' made us pass the desired
// size, if so 'age' is the new threshold
if (total > desired_survivor_size) break;
age++;
uint result;
if (AlwaysTenure || NeverTenure) {
assert(MaxTenuringThreshold == 0 || MaxTenuringThreshold == markOopDesc::max_age + 1,
err_msg("MaxTenuringThreshold should be 0 or markOopDesc::max_age + 1, but is ", MaxTenuringThreshold));
result = MaxTenuringThreshold;
} else {
size_t total = 0;
uint age = 1;
assert(sizes[0] == 0, "no objects with age zero should be recorded");
while (age < table_size) {
total += sizes[age];
// check if including objects of age 'age' made us pass the desired
// size, if so 'age' is the new threshold
if (total > desired_survivor_size) break;
age++;
}
result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
}
uint result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
if (PrintTenuringDistribution || UsePerfData) {
if (PrintTenuringDistribution) {
gclog_or_tty->cr();
gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)",
gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold "
UINTX_FORMAT " (max threshold " UINTX_FORMAT ")",
desired_survivor_size*oopSize, result, MaxTenuringThreshold);
}
total = 0;
age = 1;
size_t total = 0;
uint age = 1;
while (age < table_size) {
total += sizes[age];
if (sizes[age] > 0) {