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/*
* Copyright (c) 2013, 2021, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
package com.sun.prism.impl;
import java.lang.ref.WeakReference;
/**
* The base implementation of the {@link ResourcePool} interface, providing
* bookkeeping for the {@link managed()} method and support for sharing
* resources amongst multiple pools.
* @param the type of objects stored in this resource pool
*/
public abstract class BaseResourcePool implements ResourcePool {
// Number of calls to freeDisposalRequestedAndCheckResources() before we
// consider a resource to have not been used in a hypothetical "FOREVER".
private static final int FOREVER = 1024;
// Number of calls to freeDisposalRequestedAndCheckResources() before we
// consider a resource to have not been used "RECENTLY", with different
// cutoffs for useful and unuseful textures.
private static final int RECENTLY_USEFUL = 100;
private static final int RECENT = 10;
static interface Predicate {
boolean test(ManagedResource mr);
}
private static final Predicate stageTesters[];
private static final String stageReasons[];
static {
stageTesters = new Predicate[6];
stageReasons = new String[6];
stageTesters[0] = (mr) -> { return !mr.isInteresting() && mr.getAge() > FOREVER; };
stageReasons[0] = "Pruning unuseful older than "+FOREVER;
stageTesters[1] = (mr) -> { return !mr.isInteresting() && mr.getAge() > FOREVER/2; };
stageReasons[1] = "Pruning unuseful older than "+FOREVER/2;
stageTesters[2] = (mr) -> { return !mr.isInteresting() && mr.getAge() > RECENT; };
stageReasons[2] = "Pruning unuseful older than "+RECENT;
stageTesters[3] = (mr) -> { return mr.getAge() > FOREVER; };
stageReasons[3] = "Pruning all older than "+FOREVER;
stageTesters[4] = (mr) -> { return mr.getAge() > FOREVER/2; };
stageReasons[4] = "Pruning all older than "+FOREVER/2;
stageTesters[5] = (mr) -> { return mr.getAge() > RECENTLY_USEFUL; };
stageReasons[5] = "Pruning all older than "+RECENTLY_USEFUL;
}
long managedSize;
final long origTarget;
long curTarget;
final long maxSize;
final ResourcePool sharedParent;
private final Thread managerThread;
private WeakLinkedList resourceHead;
protected BaseResourcePool(long target, long max) {
this(null, target, max);
}
protected BaseResourcePool(ResourcePool parent) {
this(parent, parent.target(), parent.max());
}
protected BaseResourcePool(ResourcePool parent, long target, long max) {
this.resourceHead = new WeakLinkedList<>();
this.sharedParent = parent;
this.origTarget = this.curTarget = target;
this.maxSize = ((parent == null)
? max
: Math.min(parent.max(), max));
managerThread = Thread.currentThread();
}
/**
* Clean up the resources in the indicated pool using a standard
* algorithm until at least the specified amount of resource units
* have been reclaimed.
* The standard algorithm uses the following stages until it obtains
* enough room in the pool:
*
*
Prune any resources which are already free, but have not been
* accounted for yet.
*
Go through a few passes cleaning out any non-interesting resources
* that have not been used in a long time with decreasing cutoff
* limits for the maximum age of the resource.
*
Go through more passes cleaning out even interesting resources that
* have not been used in a fairly long time with decreasing age limits.
*
Attempt to grow the target to accommodate the new request.
*
Finally, prune any resources that are not currently in the process
* of being used (i.e. locked or permanent).
*
*
* @param needed
* @return boolean indicating if the requested space is now available
*/
public boolean cleanup(long needed) {
if (used() + needed <= target()) return true;
long wasused = used();
long wanted = target() / 16;
if (wanted < needed) {
wanted = needed;
}
if (PrismSettings.poolDebug) {
System.err.printf("Need %,d (hoping for %,d) from pool: %s\n", needed, wanted, this);
printSummary(false);
}
try {
// First cleanup pass is just for previously freed resources that
// are in the Disposer queue already or were manually freed by
// mechanisms and are still in the accounting list.
// The pruner predicate choose no additional resources to free.
Disposer.cleanUp();
if (PrismSettings.poolDebug) System.err.println("Pruning obsolete in pool: "+this);
cleanup((mr) -> { return false; });
if (used() + wanted <= target()) return true;
// Multiple stages of pruning useful and unuseful resources of
// various ages as determined by the static initializer above.
for (int stage = 0; stage < stageTesters.length; stage++) {
if (PrismSettings.poolDebug) {
System.err.println(stageReasons[stage]+" in pool: "+this);
}
cleanup(stageTesters[stage]);
if (used() + wanted <= target()) return true;
}
// Now look to grow the target if we can satisfy this allocation at
// less than max().
long rem = max() - used();
if (wanted > rem) {
wanted = needed;
}
if (wanted <= rem) {
long grow = (max() - origTarget()) / 32;
if (grow < wanted) {
grow = wanted;
} else if (grow > rem) {
grow = rem;
}
setTarget(used() + grow);
if (PrismSettings.poolDebug || PrismSettings.verbose) {
System.err.printf("Growing pool %s target to %,d\n", this, target());
}
return true;
}
// Finally, look to the garbage collector to dislodge some unreferenced
// resources that we can free with a very aggressive age set of (0, 0)
// which will target all unlocked/non-permanent textures.
// Two tries, one with just a gc(), and a desperate one with a sleep...
for (int i = 0; i < 2; i++) {
pruneLastChance(i > 0);
if (used() + needed <= max()) {
if (used() + needed > target()) {
setTarget(used() + needed);
if (PrismSettings.poolDebug || PrismSettings.verbose) {
System.err.printf("Growing pool %s target to %,d\n", this, target());
}
}
return true;
}
}
// That was our last gasp, we either succeeded in making room under
// the max() amount or we failed and need to return false.
return false;
} finally {
if (PrismSettings.poolDebug) {
System.err.printf("cleaned up %,d from pool: %s\n", wasused - used(), this);
printSummary(false);
System.err.println();
}
}
}
private void pruneLastChance(boolean desperate) {
System.gc();
if (desperate) {
// Our alternative is to return false here and cause an allocation
// failure which is usually bad news for any SG, so it is worth
// sleeping on the second time around to give one last GC some time
// to find a dead resource that was dropped on the floor...
try { Thread.sleep(20); }
catch (InterruptedException e) { }
}
Disposer.cleanUp();
if (PrismSettings.poolDebug) {
if (desperate) {
System.err.print("Last chance pruning");
} else {
System.err.print("Pruning everything");
}
System.err.println(" in pool: "+this);
}
cleanup((mr) -> { return true; });
}
private void cleanup(Predicate predicate) {
WeakLinkedList prev = resourceHead;
WeakLinkedList cur = prev.next;
while (cur != null) {
ManagedResource mr = cur.getResource();
if (ManagedResource._isgone(mr)) {
if (PrismSettings.poolDebug) showLink("unlinking", cur, false);
recordFree(cur.size);
cur = cur.next;
prev.next = cur;
} else if (!mr.isPermanent() &&
!mr.isLocked() &&
predicate.test(mr))
{
if (PrismSettings.poolDebug) showLink("pruning", cur, true);
mr.free();
mr.resource = null;
recordFree(cur.size);
cur = cur.next;
prev.next = cur;
} else {
prev = cur;
cur = cur.next;
}
}
}
static void showLink(String label, WeakLinkedList cur, boolean showAge) {
ManagedResource mr = cur.getResource();
System.err.printf("%s: %s (size=%,d)", label, mr, cur.size);
if (mr != null) {
if (showAge) {
System.err.printf(" (age=%d)", mr.getAge());
}
if (mr.isPermanent()) System.err.print(" perm");
if (mr.isLocked()) System.err.print(" lock");
if (mr.isInteresting()) System.err.print(" int");
}
System.err.println();
}
/**
* Check that all resources are in the correct state for an idle condition
* and free any resources which were disposed from a non-resource thread.
* This method must be called on a thread that is appropriate for disposing
* and managing resources for the resource pools.
* The boolean {@code forgiveStaleLocks} parameter is used to indicate that
* an exceptional condition occurred which caused the caller to abort a
* cycle of resource usage, potentially with outstanding resource locks.
* This method will unlock all non-permanent resources that have outstanding
* locks if {@code forgiveStaleLocks} is {@code true}, or it will print out
* a warning and a resource summary if that parameter is {@code false}.
*
* @param forgiveStaleLocks {@code true} if the caller wishes to forgive
* and unlock all outstanding locks on non-permanent resources
*/
@Override
public void freeDisposalRequestedAndCheckResources(boolean forgiveStaleLocks) {
boolean anyLockedResources = false;
WeakLinkedList prev = resourceHead;
WeakLinkedList cur = prev.next;
while (cur != null) {
ManagedResource mr = cur.getResource();
if (ManagedResource._isgone(mr)) {
recordFree(cur.size);
cur = cur.next;
prev.next = cur;
} else {
if (!mr.isPermanent()) {
if (mr.isLocked() && !mr.wasMismatched()) {
if (forgiveStaleLocks) {
mr.unlockall();
} else {
mr.setMismatched();
anyLockedResources = true;
}
}
mr.bumpAge(FOREVER);
}
prev = cur;
cur = cur.next;
}
}
if (PrismSettings.poolStats || anyLockedResources) {
if (anyLockedResources) {
System.err.println("Outstanding resource locks detected:");
}
printSummary(true);
System.err.println();
}
}
static String commas(long v) {
return String.format("%,d", v);
}
public void printSummary(boolean printlocksources) {
int numgone = 0;
int numlocked = 0;
int numpermanent = 0;
int numinteresting = 0;
int nummismatched = 0;
int numancient = 0;
long total_age = 0;
int total = 0;
boolean trackLockSources = ManagedResource.trackLockSources;
double percentUsed = used() * 100.0 / max();
double percentTarget = target() * 100.0 / max();
System.err.printf("%s: %,d used (%.1f%%), %,d target (%.1f%%), %,d max\n",
this, used(), percentUsed,
target(), percentTarget,
max());
for (WeakLinkedList cur = resourceHead.next; cur != null; cur = cur.next) {
ManagedResource mr = cur.getResource();
total++;
if (mr == null || !mr.isValid() || mr.isDisposalRequested()) {
numgone++;
} else {
int a = mr.getAge();
total_age += a;
if (a >= FOREVER) {
numancient++;
}
if (mr.wasMismatched()) {
nummismatched++;
}
if (mr.isPermanent()) {
numpermanent++;
} else if (mr.isLocked()) {
numlocked++;
if (trackLockSources && printlocksources) {
for (Throwable th : mr.lockedFrom) {
th.printStackTrace(System.err);
}
mr.lockedFrom.clear();
}
}
if (mr.isInteresting()) {
numinteresting++;
}
}
}
double avg_age = ((double) total_age) / total;
System.err.println(total+" total resources being managed");
System.err.printf("average resource age is %.1f frames\n", avg_age);
printpoolpercent(numancient, total, "at maximum supported age");
printpoolpercent(numpermanent, total, "marked permanent");
printpoolpercent(nummismatched, total, "have had mismatched locks");
printpoolpercent(numlocked, total, "locked");
printpoolpercent(numinteresting, total, "contain interesting data");
printpoolpercent(numgone, total, "disappeared");
}
private static void printpoolpercent(int stat, int total, String desc) {
double percent = stat * 100.0 / total;
System.err.printf("%,d resources %s (%.1f%%)\n", stat, desc, percent);
}
@Override
public boolean isManagerThread() {
return Thread.currentThread() == managerThread;
}
@Override
public final long managed() {
return managedSize;
}
@Override
public long used() {
if (sharedParent != null) {
return sharedParent.used();
}
return managedSize;
}
@Override
public final long max() {
return maxSize;
}
@Override
public final long origTarget() {
return origTarget;
}
@Override
public final long target() {
return curTarget;
}
@Override
public final void setTarget(long newTarget) {
if (newTarget > maxSize) {
throw new IllegalArgumentException("New target "+newTarget+
" larger than max "+maxSize);
}
if (newTarget < origTarget) {
throw new IllegalArgumentException("New target "+newTarget+
" smaller than initial target "+origTarget);
}
curTarget = newTarget;
}
@Override
public boolean prepareForAllocation(long size) {
return cleanup(size);
}
@Override
public final void recordAllocated(long size) {
managedSize += size;
}
@Override
public final void resourceManaged(ManagedResource mr) {
long size = size(mr.resource);
resourceHead.insert(mr, size);
recordAllocated(size);
}
@Override
public final void resourceFreed(ManagedResource freed) {
WeakLinkedList prev = resourceHead;
WeakLinkedList cur = prev.next;
while (cur != null) {
ManagedResource res = cur.getResource();
if (res == null || res == freed) {
recordFree(cur.size);
cur = cur.next;
prev.next = cur;
if (res == freed) {
return;
}
} else {
prev = cur;
cur = cur.next;
}
}
// If we get here, the resource is not currently being managed. This
// can happen when the Disposer processes its queue of disposed records
// and encounters a record that was previously reclaimed via
// cleanup() or freeDisposalRequestedAndCheckResources(), when the
// device is lost or removed. We can safely ignore it.
if (PrismSettings.poolDebug) {
System.err.println("Warning: unmanaged resource " + freed +
" freed from pool: " + this);
}
}
@Override
public final void recordFree(long size) {
managedSize -= size;
if (managedSize < 0) {
throw new IllegalStateException("Negative resource amount");
}
}
static class WeakLinkedList {
final WeakReference> theResourceRef;
final long size;
WeakLinkedList next;
WeakLinkedList() {
this.theResourceRef = null;
this.size = 0L;
}
WeakLinkedList(ManagedResource mresource, long size, WeakLinkedList next) {
this.theResourceRef = new WeakReference<>(mresource);
this.size = size;
this.next = next;
}
void insert(ManagedResource mresource, long size) {
this.next = new WeakLinkedList<>(mresource, size, next);
}
ManagedResource getResource() {
return theResourceRef.get();
}
}
}
