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dragonwell8_hotspot
提交 07630a3f 编写于 作者: A asaha
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浏览文件 @ 07630a3f
...@@ -818,6 +818,8 @@ ca3b8c8e390ab0540b0cc2e5def869b38e460d86 jdk8u75-b01 ...@@ -818,6 +818,8 @@ ca3b8c8e390ab0540b0cc2e5def869b38e460d86 jdk8u75-b01
32b682649973231b54740c09b10889660f6ebde5 jdk8u75-b04 32b682649973231b54740c09b10889660f6ebde5 jdk8u75-b04
1f43bd4fab06d2ca5d1964611df14d8506d6b36e jdk8u75-b05 1f43bd4fab06d2ca5d1964611df14d8506d6b36e jdk8u75-b05
916712f178c39d0acbc590f38802133fc86a7346 jdk8u75-b06 916712f178c39d0acbc590f38802133fc86a7346 jdk8u75-b06
8c791dd1c24d85ebd18b03d49185c2a25263c129 jdk8u75-b07
e4a935cb6f7178912fd653e2a9514eadec7935ab jdk8u75-b08
d7b01fb81aa8a5437cb03bc36afe15cf0e55fb89 jdk8u76-b00 d7b01fb81aa8a5437cb03bc36afe15cf0e55fb89 jdk8u76-b00
c1679cc87ba045219169cabb6b9b378c2b5cc578 jdk8u76-b01 c1679cc87ba045219169cabb6b9b378c2b5cc578 jdk8u76-b01
218483967e52b419d885d34af4488a81c5133804 jdk8u76-b02 218483967e52b419d885d34af4488a81c5133804 jdk8u76-b02
...@@ -825,4 +827,6 @@ c1679cc87ba045219169cabb6b9b378c2b5cc578 jdk8u76-b01 ...@@ -825,4 +827,6 @@ c1679cc87ba045219169cabb6b9b378c2b5cc578 jdk8u76-b01
16f7b676725aadafb79ea105b22df112e2593a78 jdk8u76-b04 16f7b676725aadafb79ea105b22df112e2593a78 jdk8u76-b04
35bfaf7f9021b5c1e86effbeac075753a82e9a0c jdk8u76-b05 35bfaf7f9021b5c1e86effbeac075753a82e9a0c jdk8u76-b05
6449ee3bf707225372709ac830524c00984c601f jdk8u76-b06 6449ee3bf707225372709ac830524c00984c601f jdk8u76-b06
7d1074c74d6000ec8257917ebfcee3fed4249f7d jdk8u76-b07
392f8722fc513e28f78c5c563d51af7dc8466b29 jdk8u76-b08
b374548dcb4834eb8731a06b52faddd0f10bd45d jdk8u81-b00 b374548dcb4834eb8731a06b52faddd0f10bd45d jdk8u81-b00
src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
浏览文件 @ 07630a3f
...@@ -3839,6 +3839,16 @@ G1CollectedHeap::cleanup_surviving_young_words() { ...@@ -3839,6 +3839,16 @@ G1CollectedHeap::cleanup_surviving_young_words() {
_surviving_young_words = NULL; _surviving_young_words = NULL;
} }
class VerifyRegionRemSetClosure : public HeapRegionClosure {
public:
bool doHeapRegion(HeapRegion* hr) {
if (!hr->continuesHumongous()) {
hr->verify_rem_set();
}
return false;
}
};
#ifdef ASSERT #ifdef ASSERT
class VerifyCSetClosure: public HeapRegionClosure { class VerifyCSetClosure: public HeapRegionClosure {
public: public:
...@@ -4015,6 +4025,14 @@ G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { ...@@ -4015,6 +4025,14 @@ G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) {
increment_total_collections(false /* full gc */); increment_total_collections(false /* full gc */);
increment_gc_time_stamp(); increment_gc_time_stamp();
if (VerifyRememberedSets) {
if (!VerifySilently) {
gclog_or_tty->print_cr("[Verifying RemSets before GC]");
}
VerifyRegionRemSetClosure v_cl;
heap_region_iterate(&v_cl);
}
verify_before_gc(); verify_before_gc();
check_bitmaps("GC Start"); check_bitmaps("GC Start");
...@@ -4246,6 +4264,14 @@ G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) { ...@@ -4246,6 +4264,14 @@ G1CollectedHeap::do_collection_pause_at_safepoint(double target_pause_time_ms) {
// scanning cards (see CR 7039627). // scanning cards (see CR 7039627).
increment_gc_time_stamp(); increment_gc_time_stamp();
if (VerifyRememberedSets) {
if (!VerifySilently) {
gclog_or_tty->print_cr("[Verifying RemSets after GC]");
}
VerifyRegionRemSetClosure v_cl;
heap_region_iterate(&v_cl);
}
verify_after_gc(); verify_after_gc();
check_bitmaps("GC End"); check_bitmaps("GC End");
......
src/share/vm/gc_implementation/g1/heapRegion.cpp
浏览文件 @ 07630a3f
...@@ -639,8 +639,8 @@ void HeapRegion::print_on(outputStream* st) const { ...@@ -639,8 +639,8 @@ void HeapRegion::print_on(outputStream* st) const {
G1OffsetTableContigSpace::print_on(st); G1OffsetTableContigSpace::print_on(st);
} }
class VerifyLiveClosure: public OopClosure { class G1VerificationClosure : public OopClosure {
private: protected:
G1CollectedHeap* _g1h; G1CollectedHeap* _g1h;
CardTableModRefBS* _bs; CardTableModRefBS* _bs;
oop _containing_obj; oop _containing_obj;
...@@ -651,7 +651,7 @@ public: ...@@ -651,7 +651,7 @@ public:
// _vo == UsePrevMarking -> use "prev" marking information, // _vo == UsePrevMarking -> use "prev" marking information,
// _vo == UseNextMarking -> use "next" marking information, // _vo == UseNextMarking -> use "next" marking information,
// _vo == UseMarkWord -> use mark word from object header. // _vo == UseMarkWord -> use mark word from object header.
VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : G1VerificationClosure(G1CollectedHeap* g1h, VerifyOption vo) :
_g1h(g1h), _bs(NULL), _containing_obj(NULL), _g1h(g1h), _bs(NULL), _containing_obj(NULL),
_failures(false), _n_failures(0), _vo(vo) _failures(false), _n_failures(0), _vo(vo)
{ {
...@@ -667,9 +667,6 @@ public: ...@@ -667,9 +667,6 @@ public:
bool failures() { return _failures; } bool failures() { return _failures; }
int n_failures() { return _n_failures; } int n_failures() { return _n_failures; }
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
void print_object(outputStream* out, oop obj) { void print_object(outputStream* out, oop obj) {
#ifdef PRODUCT #ifdef PRODUCT
Klass* k = obj->klass(); Klass* k = obj->klass();
...@@ -679,19 +676,31 @@ public: ...@@ -679,19 +676,31 @@ public:
obj->print_on(out); obj->print_on(out);
#endif // PRODUCT #endif // PRODUCT
} }
};
class VerifyLiveClosure : public G1VerificationClosure {
public:
VerifyLiveClosure(G1CollectedHeap* g1h, VerifyOption vo) : G1VerificationClosure(g1h, vo) {}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop(oop* p) { do_oop_work(p); }
template <class T> template <class T>
void do_oop_work(T* p) { void do_oop_work(T* p) {
assert(_containing_obj != NULL, "Precondition"); assert(_containing_obj != NULL, "Precondition");
assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo),
"Precondition"); "Precondition");
verify_liveness(p);
}
template <class T>
void verify_liveness(T* p) {
T heap_oop = oopDesc::load_heap_oop(p); T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) { if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
bool failed = false; bool failed = false;
if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) {
MutexLockerEx x(ParGCRareEvent_lock, MutexLockerEx x(ParGCRareEvent_lock,
Mutex::_no_safepoint_check_flag); Mutex::_no_safepoint_check_flag);
if (!_failures) { if (!_failures) {
gclog_or_tty->cr(); gclog_or_tty->cr();
...@@ -727,50 +736,71 @@ public: ...@@ -727,50 +736,71 @@ public:
failed = true; failed = true;
_n_failures++; _n_failures++;
} }
}
}
};
if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { class VerifyRemSetClosure : public G1VerificationClosure {
HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); public:
HeapRegion* to = _g1h->heap_region_containing(obj); VerifyRemSetClosure(G1CollectedHeap* g1h, VerifyOption vo) : G1VerificationClosure(g1h, vo) {}
if (from != NULL && to != NULL && virtual void do_oop(narrowOop* p) { do_oop_work(p); }
from != to && virtual void do_oop(oop* p) { do_oop_work(p); }
!to->isHumongous()) {
jbyte cv_obj = *_bs->byte_for_const(_containing_obj); template <class T>
jbyte cv_field = *_bs->byte_for_const(p); void do_oop_work(T* p) {
const jbyte dirty = CardTableModRefBS::dirty_card_val(); assert(_containing_obj != NULL, "Precondition");
assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo),
bool is_bad = !(from->is_young() "Precondition");
|| to->rem_set()->contains_reference(p) verify_remembered_set(p);
|| !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed }
(_containing_obj->is_objArray() ?
cv_field == dirty template <class T>
: cv_obj == dirty || cv_field == dirty)); void verify_remembered_set(T* p) {
if (is_bad) { T heap_oop = oopDesc::load_heap_oop(p);
MutexLockerEx x(ParGCRareEvent_lock, if (!oopDesc::is_null(heap_oop)) {
Mutex::_no_safepoint_check_flag); oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
bool failed = false;
if (!_failures) { HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
gclog_or_tty->cr(); HeapRegion* to = _g1h->heap_region_containing(obj);
gclog_or_tty->print_cr("----------"); if (from != NULL && to != NULL &&
} from != to &&
gclog_or_tty->print_cr("Missing rem set entry:"); !to->isHumongous()) {
gclog_or_tty->print_cr("Field "PTR_FORMAT" " jbyte cv_obj = *_bs->byte_for_const(_containing_obj);
"of obj "PTR_FORMAT", " jbyte cv_field = *_bs->byte_for_const(p);
"in region "HR_FORMAT, const jbyte dirty = CardTableModRefBS::dirty_card_val();
p, (void*) _containing_obj,
HR_FORMAT_PARAMS(from)); bool is_bad = !(from->is_young()
_containing_obj->print_on(gclog_or_tty); || to->rem_set()->contains_reference(p)
gclog_or_tty->print_cr("points to obj "PTR_FORMAT" " || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed
"in region "HR_FORMAT, (_containing_obj->is_objArray() ?
(void*) obj, cv_field == dirty
HR_FORMAT_PARAMS(to)); : cv_obj == dirty || cv_field == dirty));
obj->print_on(gclog_or_tty); if (is_bad) {
gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.", MutexLockerEx x(ParGCRareEvent_lock,
cv_obj, cv_field); Mutex::_no_safepoint_check_flag);
if (!_failures) {
gclog_or_tty->cr();
gclog_or_tty->print_cr("----------"); gclog_or_tty->print_cr("----------");
gclog_or_tty->flush();
_failures = true;
if (!failed) _n_failures++;
} }
gclog_or_tty->print_cr("Missing rem set entry:");
gclog_or_tty->print_cr("Field "PTR_FORMAT" "
"of obj "PTR_FORMAT", "
"in region "HR_FORMAT,
p, (void*) _containing_obj,
HR_FORMAT_PARAMS(from));
_containing_obj->print_on(gclog_or_tty);
gclog_or_tty->print_cr("points to obj "PTR_FORMAT" "
"in region "HR_FORMAT,
(void*) obj,
HR_FORMAT_PARAMS(to));
obj->print_on(gclog_or_tty);
gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.",
cv_obj, cv_field);
gclog_or_tty->print_cr("----------");
gclog_or_tty->flush();
_failures = true;
if (!failed) _n_failures++;
} }
} }
} }
...@@ -787,6 +817,7 @@ void HeapRegion::verify(VerifyOption vo, ...@@ -787,6 +817,7 @@ void HeapRegion::verify(VerifyOption vo,
HeapWord* p = bottom(); HeapWord* p = bottom();
HeapWord* prev_p = NULL; HeapWord* prev_p = NULL;
VerifyLiveClosure vl_cl(g1, vo); VerifyLiveClosure vl_cl(g1, vo);
VerifyRemSetClosure vr_cl(g1, vo);
bool is_humongous = isHumongous(); bool is_humongous = isHumongous();
bool do_bot_verify = !is_young(); bool do_bot_verify = !is_young();
size_t object_num = 0; size_t object_num = 0;
...@@ -832,7 +863,23 @@ void HeapRegion::verify(VerifyOption vo, ...@@ -832,7 +863,23 @@ void HeapRegion::verify(VerifyOption vo,
return; return;
} else { } else {
vl_cl.set_containing_obj(obj); vl_cl.set_containing_obj(obj);
obj->oop_iterate_no_header(&vl_cl); if (!g1->full_collection() || G1VerifyRSetsDuringFullGC) {
// verify liveness and rem_set
vr_cl.set_containing_obj(obj);
G1Mux2Closure mux(&vl_cl, &vr_cl);
obj->oop_iterate_no_header(&mux);
if (vr_cl.failures()) {
*failures = true;
}
if (G1MaxVerifyFailures >= 0 &&
vr_cl.n_failures() >= G1MaxVerifyFailures) {
return;
}
} else {
// verify only liveness
obj->oop_iterate_no_header(&vl_cl);
}
if (vl_cl.failures()) { if (vl_cl.failures()) {
*failures = true; *failures = true;
} }
...@@ -842,7 +889,7 @@ void HeapRegion::verify(VerifyOption vo, ...@@ -842,7 +889,7 @@ void HeapRegion::verify(VerifyOption vo,
} }
} }
} else { } else {
gclog_or_tty->print_cr(PTR_FORMAT" no an oop", (void *)obj); gclog_or_tty->print_cr(PTR_FORMAT" not an oop", (void *)obj);
*failures = true; *failures = true;
return; return;
} }
...@@ -930,6 +977,46 @@ void HeapRegion::verify() const { ...@@ -930,6 +977,46 @@ void HeapRegion::verify() const {
verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy); verify(VerifyOption_G1UsePrevMarking, /* failures */ &dummy);
} }
void HeapRegion::verify_rem_set(VerifyOption vo, bool* failures) const {
G1CollectedHeap* g1 = G1CollectedHeap::heap();
*failures = false;
HeapWord* p = bottom();
HeapWord* prev_p = NULL;
VerifyRemSetClosure vr_cl(g1, vo);
while (p < top()) {
oop obj = oop(p);
size_t obj_size = block_size(p);
if (!g1->is_obj_dead_cond(obj, this, vo)) {
if (obj->is_oop()) {
vr_cl.set_containing_obj(obj);
obj->oop_iterate_no_header(&vr_cl);
if (vr_cl.failures()) {
*failures = true;
}
if (G1MaxVerifyFailures >= 0 &&
vr_cl.n_failures() >= G1MaxVerifyFailures) {
return;
}
} else {
gclog_or_tty->print_cr(PTR_FORMAT " not an oop", p2i(obj));
*failures = true;
return;
}
}
prev_p = p;
p += obj_size;
}
}
void HeapRegion::verify_rem_set() const {
bool failures = false;
verify_rem_set(VerifyOption_G1UsePrevMarking, &failures);
guarantee(!failures, "HeapRegion RemSet verification failed");
}
// G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go // G1OffsetTableContigSpace code; copied from space.cpp. Hope this can go
// away eventually. // away eventually.
......
src/share/vm/gc_implementation/g1/heapRegion.hpp
浏览文件 @ 07630a3f
...@@ -779,6 +779,9 @@ class HeapRegion: public G1OffsetTableContigSpace { ...@@ -779,6 +779,9 @@ class HeapRegion: public G1OffsetTableContigSpace {
// Override; it uses the "prev" marking information // Override; it uses the "prev" marking information
virtual void verify() const; virtual void verify() const;
void verify_rem_set(VerifyOption vo, bool *failures) const;
void verify_rem_set() const;
}; };
// HeapRegionClosure is used for iterating over regions. // HeapRegionClosure is used for iterating over regions.
......
test/compiler/loopopts/CountedLoopProblem.java
浏览文件 @ 07630a3f
...@@ -36,18 +36,22 @@ public class CountedLoopProblem { ...@@ -36,18 +36,22 @@ public class CountedLoopProblem {
public static void main(String[] args) throws Exception { public static void main(String[] args) throws Exception {
Random r = new Random(42); Random r = new Random(42);
int x = 0; int x = 0;
StringBuilder sb = new StringBuilder(); try {
for(int i = 0; i < 1000000; ++i) { StringBuilder sb = new StringBuilder();
int v = Math.abs(r.nextInt()); for(int i = 0; i < 1000000; ++i) {
sb.append('+').append(v).append('\n'); int v = Math.abs(r.nextInt());
x += v; sb.append('+').append(v).append('\n');
// To trigger the problem we must OSR in the following loop x += v;
// To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62 // To trigger the problem we must OSR in the following loop
while(x < 0) x += 1000000000; // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62
sb.append('=').append(x).append('\n'); while(x < 0) x += 1000000000;
} sb.append('=').append(x).append('\n');
if (sb.toString().hashCode() != 0xaba94591) { }
throw new Exception("Unexpected result"); if (sb.toString().hashCode() != 0xaba94591) {
throw new Exception("Unexpected result");
}
} catch(OutOfMemoryError e) {
// small heap, ignore
} }
} }
} }
......
test/stress/gc/TestStressRSetCoarsening.java 0 → 100644
浏览文件 @ 07630a3f
/*
* Copyright (c) 2016, 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.util.concurrent.TimeoutException;
import sun.hotspot.WhiteBox;
/*
* @test TestStressRSetCoarsening.java
* @key stress
* @bug 8146984 8147087
* @requires vm.gc=="G1" | vm.gc=="null"
* @requires os.maxMemory > 3G
*
* @summary Stress G1 Remembered Set by creating a lot of cross region links
* @library /testlibrary /testlibrary/whitebox
* @build sun.hotspot.WhiteBox
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm/timeout=300
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
* -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
* -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 1 0 300
* @run main/othervm/timeout=300
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
* -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
* -Xmx500m -XX:G1HeapRegionSize=8m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 1 10 300
* @run main/othervm/timeout=300
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
* -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
* -Xmx500m -XX:G1HeapRegionSize=32m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 42 10 300
* @run main/othervm/timeout=300
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
* -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
* -Xmx500m -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 2 0 300
* @run main/othervm/timeout=1800
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
* -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
* -Xmx1G -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 500 0 1800
* @run main/othervm/timeout=1800
* -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseG1GC
* -XX:+IgnoreUnrecognizedVMOptions -XX:+PrintGC -XX:+PrintGCTimeStamps -Xlog:gc
* -Xmx1G -XX:G1HeapRegionSize=1m -XX:MaxGCPauseMillis=1000 TestStressRSetCoarsening 10 10 1800
*/
/**
* What the test does.
* Preparation stage:
* Fill out ~90% of the heap with objects, each object is an object array.
* If we want to allocate K objects per region, we calculate N to meet:
* sizeOf(Object[N]) ~= regionSize / K
* Stress stage:
* No more allocation, so no more GC.
* We will perform a number of iterations. On each iteration i,
* for each pair of regions Rx and Ry we will set c[i] references
* from Rx to Ry. If c[i] less than c[i-1] at the end of iteration
* concurrent mark cycle will be initiated (to recalculate remembered sets).
* As the result RSet will be growing up and down, up and down many times.
*
* The test expects: no crash and no timeouts.
*
* Test Parameters:
* args[0] - number of objects per Heap Region (1 - means humongous)
* args[1] - number of regions to refresh to provoke GC at the end of cycle.
* (0 - means no GC, i.e. no reading from RSet)
* args[2] - timeout in seconds (to stop execution to avoid jtreg timeout)
*/
public class TestStressRSetCoarsening {
public static void main(String... args) throws InterruptedException {
if (args.length != 3) {
throw new IllegalArgumentException("Wrong number of arguments " + args.length);
}
int objectsPerRegion = Integer.parseInt(args[0]); // 1 means humongous
int regsToRefresh = Integer.parseInt(args[1]); // 0 means no regions to refresh at the end of cycle
int timeout = Integer.parseInt(args[2]); // in seconds, test should stop working eariler
new TestStressRSetCoarsening(objectsPerRegion, regsToRefresh, timeout).go();
}
private static final long KB = 1024;
private static final long MB = 1024 * KB;
private static final WhiteBox WB = WhiteBox.getWhiteBox();
public final Object[][] storage;
/**
* Number of objects per region. This is a test parameter.
*/
public final int K;
/**
* Length of object array: sizeOf(Object[N]) ~= regionSize / K
* N will be calculated as function of K.
*/
public final int N;
/**
* How many regions involved into testing.
* Will be calculated as heapFractionToAllocate * freeRegionCount.
*/
public final int regionCount;
/**
* How much heap to use.
*/
public final float heapFractionToAllocate = 0.9f;
/**
* How many regions to be refreshed at the end of cycle.
* This is a test parameter.
*/
public final int regsToRefresh;
/**
* Initial time.
*/
public final long start;
/**
* Time when the test should stop working.
*/
public final long finishAt;
/**
* Does pre-calculation and allocate necessary objects.
*
* @param objPerRegions how many objects per G1 heap region
*/
TestStressRSetCoarsening(int objPerRegions, int regsToRefresh, int timeout) {
this.K = objPerRegions;
this.regsToRefresh = regsToRefresh;
this.start = System.currentTimeMillis();
this.finishAt = start + timeout * 900; // 10% ahead of jtreg timeout
long regionSize = WB.g1RegionSize();
// How many free regions
Runtime rt = Runtime.getRuntime();
long used = rt.totalMemory() - rt.freeMemory();
long totalFree = rt.maxMemory() - used;
regionCount = (int) ((totalFree / regionSize) * heapFractionToAllocate);
long toAllocate = regionCount * regionSize;
System.out.println("%% Test parameters");
System.out.println("%% Objects per region : " + K);
System.out.println("%% Heap fraction to allocate : " + (int) (heapFractionToAllocate * 100) + "%");
System.out.println("%% Regions to refresh to provoke GC: " + regsToRefresh);
System.out.println("%% Memory");
System.out.println("%% used : " + used / MB + "M");
System.out.println("%% available : " + totalFree / MB + "M");
System.out.println("%% to allocate : " + toAllocate / MB + "M");
System.out.println("%% (in regs) : " + regionCount);
System.out.println("%% G1 Region Size: " + regionSize / MB + "M");
int refSize = WB.getHeapOopSize();
// Calculate N: K*sizeOf(Object[N]) ~= regionSize
// sizeOf(Object[N]) ~= (N+4)*refSize
// ==>
// N = regionSize / K / refSize - 4;
N = (int) ((regionSize / K) / refSize) - 5;
/*
* --------------
* region0 storage[0] = new Object[N]
* ...
* storage[K-1] = new Object[N]
* ---------------
* region1 storage[K] = new Object[N]
* ...
* storage[2*K - 1] = new Object[N]
* --------------
* ...
* --------------
* regionX storage[X*K] = new Object[N]
* ...
* storage[(X+1)*K -1] = new Object[N]
* where X = HeapFraction * TotalRegions
* -------------
*/
System.out.println("%% Objects");
System.out.println("%% N (array length) : " + N);
System.out.println("%% K (objects in regions): " + K);
System.out.println("%% Reference size : " + refSize);
System.out.println("%% Approximate obj size : " + (N + 2) * refSize / KB + "K)");
storage = new Object[regionCount * K][];
for (int i = 0; i < storage.length; i++) {
storage[i] = new Object[N];
}
}
public void go() throws InterruptedException {
// threshold for sparce -> fine
final int FINE = WB.getIntxVMFlag("G1RSetSparseRegionEntries").intValue();
// threshold for fine -> coarse
final int COARSE = WB.getIntxVMFlag("G1RSetRegionEntries").intValue();
// regToRegRefCounts - array of reference counts from region to region
// at the the end of iteration.
// The number of test iterations is array length - 1.
// If c[i] > c[i-1] then during the iteration i more references will
// be created.
// If c[i] < c[i-1] then some referenes will be cleaned.
int[] regToRegRefCounts = {0, FINE / 2, 0, FINE, (FINE + COARSE) / 2, 0,
COARSE, COARSE + 10, FINE + 1, FINE / 2, 0};
// For progress tracking
int[] progress = new int[regToRegRefCounts.length];
progress[0] = 0;
for (int i = 1; i < regToRegRefCounts.length; i++) {
progress[i] = progress[i - 1] + Math.abs(regToRegRefCounts[i] - regToRegRefCounts[i - 1]);
}
try {
for (int i = 1; i < regToRegRefCounts.length; i++) {
int pre = regToRegRefCounts[i - 1];
int cur = regToRegRefCounts[i];
float prog = ((float) progress[i - 1] / progress[progress.length - 1]);
System.out.println("%% step " + i
+ " out of " + (regToRegRefCounts.length - 1)
+ " (~" + (int) (100 * prog) + "% done)");
System.out.println("%% " + pre + " --> " + cur);
for (int to = 0; to < regionCount; to++) {
// Select a celebrity object that we will install references to.
// The celebrity will be referred from all other regions.
// If the number of references after should be less than they
// were before, select NULL.
Object celebrity = cur > pre ? storage[to * K] : null;
for (int from = 0; from < regionCount; from++) {
if (to == from) {
continue; // no need to refer to itself
}
int step = cur > pre ? +1 : -1;
for (int rn = pre; rn != cur; rn += step) {
storage[getY(to, from, rn)][getX(to, from, rn)] = celebrity;
if (System.currentTimeMillis() > finishAt) {
throw new TimeoutException();
}
}
}
}
if (pre > cur) {
// Number of references went down.
// Need to provoke recalculation of RSet.
WB.g1StartConcMarkCycle();
while (WB.g1InConcurrentMark()) {
Thread.sleep(1);
}
}
// To force the use of rememebered set entries we need to provoke a GC.
// To induce some fragmentation, and some mixed GCs, we need
// to make a few objects unreachable.
for (int toClean = i * regsToRefresh; toClean < (i + 1) * regsToRefresh; toClean++) {
int to = toClean % regionCount;
// Need to remove all references from all regions to the region 'to'
for (int from = 0; from < regionCount; from++) {
if (to == from) {
continue; // no need to refer to itself
}
for (int rn = 0; rn <= cur; rn++) {
storage[getY(to, from, rn)][getX(to, from, rn)] = null;
}
}
// 'Refresh' storage elements for the region 'to'
// After that loop all 'old' objects in the region 'to'
// should become unreachable.
for (int k = 0; k < K; k++) {
storage[(to * K + k) % storage.length] = new Object[N];
}
}
}
} catch (TimeoutException e) {
System.out.println("%% TIMEOUT!!!");
}
long now = System.currentTimeMillis();
System.out.println("%% Summary");
System.out.println("%% Time spent : " + ((now - start) / 1000) + " seconds");
System.out.println("%% Free memory left : " + Runtime.getRuntime().freeMemory() / KB + "K");
System.out.println("%% Test passed");
}
/**
* Returns X index in the Storage of the reference #rn from the region
* 'from' to the region 'to'.
*
* @param to region # to refer to
* @param from region # to refer from
* @param rn number of reference
*
* @return X index in the range: [0 ... N-1]
*/
private int getX(int to, int from, int rn) {
return (rn * regionCount + to) % N;
}
/**
* Returns Y index in the Storage of the reference #rn from the region
* 'from' to the region 'to'.
*
* @param to region # to refer to
* @param from region # to refer from
* @param rn number of reference
*
* @return Y index in the range: [0 ... K*regionCount -1]
*/
private int getY(int to, int from, int rn) {
return ((rn * regionCount + to) / N + from * K) % (regionCount * K);
}
}
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