Mercurial > hg > graal-jvmci-8
changeset 23866:20dbd8a8e6b7
Merge
| author | asaha |
|---|---|
| date | Thu, 18 Feb 2016 10:02:52 -0800 |
| parents | 3f03f54d9e9f (current diff) d14e327c9b6a (diff) |
| children | edff9941089d |
| files | .hgtags src/share/vm/prims/jni.cpp |
| diffstat | 6 files changed, 519 insertions(+), 61 deletions(-) [+] |
line wrap: on
line diff
--- a/.hgtags Wed Feb 10 13:34:14 2016 +0000 +++ b/.hgtags Thu Feb 18 10:02:52 2016 -0800 @@ -818,6 +818,8 @@ 32b682649973231b54740c09b10889660f6ebde5 jdk8u75-b04 1f43bd4fab06d2ca5d1964611df14d8506d6b36e jdk8u75-b05 916712f178c39d0acbc590f38802133fc86a7346 jdk8u75-b06 +8c791dd1c24d85ebd18b03d49185c2a25263c129 jdk8u75-b07 +e4a935cb6f7178912fd653e2a9514eadec7935ab jdk8u75-b08 d7b01fb81aa8a5437cb03bc36afe15cf0e55fb89 jdk8u76-b00 c1679cc87ba045219169cabb6b9b378c2b5cc578 jdk8u76-b01 218483967e52b419d885d34af4488a81c5133804 jdk8u76-b02 @@ -825,4 +827,6 @@ 16f7b676725aadafb79ea105b22df112e2593a78 jdk8u76-b04 35bfaf7f9021b5c1e86effbeac075753a82e9a0c jdk8u76-b05 6449ee3bf707225372709ac830524c00984c601f jdk8u76-b06 +7d1074c74d6000ec8257917ebfcee3fed4249f7d jdk8u76-b07 +392f8722fc513e28f78c5c563d51af7dc8466b29 jdk8u76-b08 b374548dcb4834eb8731a06b52faddd0f10bd45d jdk8u81-b00
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp Wed Feb 10 13:34:14 2016 +0000 +++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp Thu Feb 18 10:02:52 2016 -0800 @@ -3839,6 +3839,16 @@ _surviving_young_words = NULL; } +class VerifyRegionRemSetClosure : public HeapRegionClosure { + public: + bool doHeapRegion(HeapRegion* hr) { + if (!hr->continuesHumongous()) { + hr->verify_rem_set(); + } + return false; + } +}; + #ifdef ASSERT class VerifyCSetClosure: public HeapRegionClosure { public: @@ -4015,6 +4025,14 @@ increment_total_collections(false /* full gc */); 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(); check_bitmaps("GC Start"); @@ -4246,6 +4264,14 @@ // scanning cards (see CR 7039627). 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(); check_bitmaps("GC End");
--- a/src/share/vm/gc_implementation/g1/heapRegion.cpp Wed Feb 10 13:34:14 2016 +0000 +++ b/src/share/vm/gc_implementation/g1/heapRegion.cpp Thu Feb 18 10:02:52 2016 -0800 @@ -639,8 +639,8 @@ G1OffsetTableContigSpace::print_on(st); } -class VerifyLiveClosure: public OopClosure { -private: +class G1VerificationClosure : public OopClosure { +protected: G1CollectedHeap* _g1h; CardTableModRefBS* _bs; oop _containing_obj; @@ -651,7 +651,7 @@ // _vo == UsePrevMarking -> use "prev" marking information, // _vo == UseNextMarking -> use "next" marking information, // _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), _failures(false), _n_failures(0), _vo(vo) { @@ -667,9 +667,6 @@ bool failures() { return _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) { #ifdef PRODUCT Klass* k = obj->klass(); @@ -679,19 +676,31 @@ obj->print_on(out); #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> void do_oop_work(T* p) { assert(_containing_obj != NULL, "Precondition"); 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); if (!oopDesc::is_null(heap_oop)) { oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); bool failed = false; if (!_g1h->is_in_closed_subset(obj) || _g1h->is_obj_dead_cond(obj, _vo)) { MutexLockerEx x(ParGCRareEvent_lock, - Mutex::_no_safepoint_check_flag); + Mutex::_no_safepoint_check_flag); if (!_failures) { gclog_or_tty->cr(); @@ -727,50 +736,71 @@ failed = true; _n_failures++; } + } + } +}; - if (!_g1h->full_collection() || G1VerifyRSetsDuringFullGC) { - HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); - HeapRegion* to = _g1h->heap_region_containing(obj); - if (from != NULL && to != NULL && - from != to && - !to->isHumongous()) { - jbyte cv_obj = *_bs->byte_for_const(_containing_obj); - jbyte cv_field = *_bs->byte_for_const(p); - const jbyte dirty = CardTableModRefBS::dirty_card_val(); +class VerifyRemSetClosure : public G1VerificationClosure { +public: + VerifyRemSetClosure(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> + void do_oop_work(T* p) { + assert(_containing_obj != NULL, "Precondition"); + assert(!_g1h->is_obj_dead_cond(_containing_obj, _vo), + "Precondition"); + verify_remembered_set(p); + } - bool is_bad = !(from->is_young() - || to->rem_set()->contains_reference(p) - || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed - (_containing_obj->is_objArray() ? - cv_field == dirty - : cv_obj == dirty || cv_field == dirty)); - if (is_bad) { - MutexLockerEx x(ParGCRareEvent_lock, - Mutex::_no_safepoint_check_flag); + template <class T> + void verify_remembered_set(T* p) { + T heap_oop = oopDesc::load_heap_oop(p); + if (!oopDesc::is_null(heap_oop)) { + oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); + bool failed = false; + HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p); + HeapRegion* to = _g1h->heap_region_containing(obj); + if (from != NULL && to != NULL && + from != to && + !to->isHumongous()) { + jbyte cv_obj = *_bs->byte_for_const(_containing_obj); + jbyte cv_field = *_bs->byte_for_const(p); + const jbyte dirty = CardTableModRefBS::dirty_card_val(); - if (!_failures) { - gclog_or_tty->cr(); - gclog_or_tty->print_cr("----------"); - } - 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); + bool is_bad = !(from->is_young() + || to->rem_set()->contains_reference(p) + || !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed + (_containing_obj->is_objArray() ? + cv_field == dirty + : cv_obj == dirty || cv_field == dirty)); + if (is_bad) { + MutexLockerEx x(ParGCRareEvent_lock, + Mutex::_no_safepoint_check_flag); + + if (!_failures) { + gclog_or_tty->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 @@ HeapWord* p = bottom(); HeapWord* prev_p = NULL; VerifyLiveClosure vl_cl(g1, vo); + VerifyRemSetClosure vr_cl(g1, vo); bool is_humongous = isHumongous(); bool do_bot_verify = !is_young(); size_t object_num = 0; @@ -832,7 +863,23 @@ return; } else { 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()) { *failures = true; } @@ -842,7 +889,7 @@ } } } 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; return; } @@ -930,6 +977,46 @@ 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 // away eventually.
--- a/src/share/vm/gc_implementation/g1/heapRegion.hpp Wed Feb 10 13:34:14 2016 +0000 +++ b/src/share/vm/gc_implementation/g1/heapRegion.hpp Thu Feb 18 10:02:52 2016 -0800 @@ -779,6 +779,9 @@ // Override; it uses the "prev" marking information 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.
--- a/test/compiler/loopopts/CountedLoopProblem.java Wed Feb 10 13:34:14 2016 +0000 +++ b/test/compiler/loopopts/CountedLoopProblem.java Thu Feb 18 10:02:52 2016 -0800 @@ -36,18 +36,22 @@ public static void main(String[] args) throws Exception { Random r = new Random(42); int x = 0; - StringBuilder sb = new StringBuilder(); - for(int i = 0; i < 1000000; ++i) { - int v = Math.abs(r.nextInt()); - sb.append('+').append(v).append('\n'); - x += v; - // To trigger the problem we must OSR in the following loop - // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62 - while(x < 0) x += 1000000000; - sb.append('=').append(x).append('\n'); - } - if (sb.toString().hashCode() != 0xaba94591) { - throw new Exception("Unexpected result"); + try { + StringBuilder sb = new StringBuilder(); + for(int i = 0; i < 1000000; ++i) { + int v = Math.abs(r.nextInt()); + sb.append('+').append(v).append('\n'); + x += v; + // To trigger the problem we must OSR in the following loop + // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62 + while(x < 0) x += 1000000000; + sb.append('=').append(x).append('\n'); + } + if (sb.toString().hashCode() != 0xaba94591) { + throw new Exception("Unexpected result"); + } + } catch(OutOfMemoryError e) { + // small heap, ignore } } }
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/stress/gc/TestStressRSetCoarsening.java Thu Feb 18 10:02:52 2016 -0800 @@ -0,0 +1,334 @@ +/* + * 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); + } +} +