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6916968: CMS: freeList.cpp:304 assert(_allocation_stats.prevSweep() + ..., "Conservation Principle")

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Fix assert and adjust demand volume computation by adding missing factor.

Reviewed-by: jmasa, tonyp
This commit is contained in:
Y. Srinivas Ramakrishna 2011-06-20 09:42:26 -07:00
parent 937d6ded89
commit 45f42598c1
2 changed files with 24 additions and 9 deletions
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17
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/freeList.cpp
View file

@ -300,8 +300,21 @@ void FreeList::verify_stats() const {
// dictionary for example, this might be the first block and
// in that case there would be no place that we could record
// the stats (which are kept in the block itself).
assert(_allocation_stats.prevSweep() + _allocation_stats.splitBirths() + 1 // Total Stock + 1
>= _allocation_stats.splitDeaths() + (ssize_t)count(), "Conservation Principle");
assert((_allocation_stats.prevSweep() + _allocation_stats.splitBirths()
+ _allocation_stats.coalBirths() + 1) // Total Production Stock + 1
>= (_allocation_stats.splitDeaths() + _allocation_stats.coalDeaths()
+ (ssize_t)count()), // Total Current Stock + depletion
err_msg("FreeList " PTR_FORMAT " of size " SIZE_FORMAT
" violates Conservation Principle: "
"prevSweep(" SIZE_FORMAT ")"
" + splitBirths(" SIZE_FORMAT ")"
" + coalBirths(" SIZE_FORMAT ") + 1 >= "
" splitDeaths(" SIZE_FORMAT ")"
" coalDeaths(" SIZE_FORMAT ")"
" + count(" SSIZE_FORMAT ")",
this, _size, _allocation_stats.prevSweep(), _allocation_stats.splitBirths(),
_allocation_stats.splitBirths(), _allocation_stats.splitDeaths(),
_allocation_stats.coalDeaths(), count()));
}
void FreeList::assert_proper_lock_protection_work() const {

16
hotspot/src/share/vm/gc_implementation/shared/allocationStats.hpp
View file

@ -99,14 +99,16 @@ class AllocationStats VALUE_OBJ_CLASS_SPEC {
// vulnerable to noisy glitches. In such cases, we
// ignore the current sample and use currently available
// historical estimates.
// XXX NEEDS TO BE FIXED
// assert(prevSweep() + splitBirths() >= splitDeaths() + (ssize_t)count, "Conservation Principle");
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// "Total Stock" "Not used at this block size"
assert(prevSweep() + splitBirths() + coalBirths() // "Total Production Stock"
>= splitDeaths() + coalDeaths() + (ssize_t)count, // "Current stock + depletion"
"Conservation Principle");
if (inter_sweep_current > _threshold) {
ssize_t demand = prevSweep() - (ssize_t)count + splitBirths() - splitDeaths();
// XXX NEEDS TO BE FIXED
// assert(demand >= 0, "Demand should be non-negative");
ssize_t demand = prevSweep() - (ssize_t)count + splitBirths() + coalBirths()
- splitDeaths() - coalDeaths();
assert(demand >= 0,
err_msg("Demand (" SSIZE_FORMAT ") should be non-negative for "
PTR_FORMAT " (size=" SIZE_FORMAT ")",
demand, this, count));
// Defensive: adjust for imprecision in event counting
if (demand < 0) {
demand = 0;