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8032463: VirtualDispatch test timeout with DeoptimizeALot

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Introduce code aging for warm method detection

Reviewed-by: kvn, twisti
This commit is contained in:
Igor Veresov 2014-05-13 11:32:10 -07:00
parent 5938d3d5b9
commit 54db2c2d61
27 changed files with 283 additions and 69 deletions
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34
hotspot/src/share/vm/oops/methodCounters.hpp
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@ -36,6 +36,15 @@ class MethodCounters: public MetaspaceObj {
u2 _number_of_breakpoints; // fullspeed debugging support
InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
// NMethod age is a counter for warm methods detection in the code cache sweeper.
// The counter is reset by the sweeper and is decremented by some of the compiled
// code. The counter values are interpreted as follows:
// 1. (HotMethodDetection..INT_MAX] - initial value, no counters inserted
// 2. (1..HotMethodDetectionLimit) - the method is warm, the counter is used
// to figure out which methods can be flushed.
// 3. (INT_MIN..0] - method is hot and will deopt and get
// recompiled without the counters
int _nmethod_age;
#ifdef TIERED
float _rate; // Events (invocation and backedge counter increments) per millisecond
@ -44,7 +53,8 @@ class MethodCounters: public MetaspaceObj {
MethodCounters() : _interpreter_invocation_count(0),
_interpreter_throwout_count(0),
_number_of_breakpoints(0)
_number_of_breakpoints(0),
_nmethod_age(INT_MAX)
#ifdef TIERED
, _rate(0),
_prev_time(0)
@ -52,6 +62,10 @@ class MethodCounters: public MetaspaceObj {
{
invocation_counter()->init();
backedge_counter()->init();
if (StressCodeAging) {
set_nmethod_age(HotMethodDetectionLimit);
}
}
public:
@ -104,6 +118,24 @@ class MethodCounters: public MetaspaceObj {
InvocationCounter* invocation_counter() { return &_invocation_counter; }
InvocationCounter* backedge_counter() { return &_backedge_counter; }
int nmethod_age() {
return _nmethod_age;
}
void set_nmethod_age(int age) {
_nmethod_age = age;
}
void reset_nmethod_age() {
set_nmethod_age(HotMethodDetectionLimit);
}
static bool is_nmethod_hot(int age) { return age <= 0; }
static bool is_nmethod_warm(int age) { return age < HotMethodDetectionLimit; }
static bool is_nmethod_age_unset(int age) { return age > HotMethodDetectionLimit; }
static ByteSize nmethod_age_offset() {
return byte_offset_of(MethodCounters, _nmethod_age);
}
static ByteSize interpreter_invocation_counter_offset() {
return byte_offset_of(MethodCounters, _interpreter_invocation_count);
}