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Bug 646641 - Part 2: Update SHistory so it understands that SHEntries may share content viewers. r=smaug

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--HG--
extra : rebase_source : 431dafff170f2e6c8aa3429d5ec0f444efc53a10
This commit is contained in:
Justin Lebar 2011-05-13 15:42:36 -04:00
parent 8e5777e1a0
commit aa17ad67fe
8 changed files with 343 additions and 261 deletions
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8
docshell/base/nsDocShell.cpp
View File

@ -9649,9 +9649,9 @@ nsDocShell::AddState(nsIVariant *aData, const nsAString& aTitle,
// It's important that this function not run arbitrary scripts after step 1
// and before completing step 5. For example, if a script called
// history.back() before we completed step 5, bfcache might destroy an
// active content viewer. Since EvictContentViewers at the end of step 5
// might run script, we can't just put a script blocker around the critical
// section.
// active content viewer. Since EvictOutOfRangeContentViewers at the end of
// step 5 might run script, we can't just put a script blocker around the
// critical section.
//
// Note that we completely ignore the aTitle parameter.
@ -9879,7 +9879,7 @@ nsDocShell::AddState(nsIVariant *aData, const nsAString& aTitle,
PRInt32 curIndex = -1;
rv = rootSH->GetIndex(&curIndex);
if (NS_SUCCEEDED(rv) && curIndex > -1) {
internalSH->EvictContentViewers(curIndex - 1, curIndex);
internalSH->EvictOutOfRangeContentViewers(curIndex);
}
}

23
docshell/shistory/public/nsISHistoryInternal.idl
View File

@ -57,7 +57,7 @@ struct nsTArrayDefaultAllocator;
[ref] native nsDocshellIDArray(nsTArray<PRUint64, nsTArrayDefaultAllocator>);
[scriptable, uuid(AFE77866-8859-4492-B131-4C58167E1630)]
[scriptable, uuid(e27cf38e-c19f-4294-bd31-d7e0916e7fa2)]
interface nsISHistoryInternal: nsISupports
{
/**
@ -96,14 +96,19 @@ interface nsISHistoryInternal: nsISupports
*/
readonly attribute nsISHistoryListener listener;
/**
* Evict content viewers until the number of content viewers per tab
* is no more than gHistoryMaxViewers. Also, count
* total number of content viewers globally and evict one if we are over
* our total max. This is always called in Show(), after we destroy
* the previous viewer.
*/
void evictContentViewers(in long previousIndex, in long index);
/**
* Evict content viewers which don't lie in the "safe" range around aIndex.
* In practice, this should leave us with no more than gHistoryMaxViewers
* viewers associated with this SHistory object.
*
* Also make sure that the total number of content viewers in all windows is
* not greater than our global max; if it is, evict viewers as appropriate.
*
* @param aIndex - The index around which the "safe" range is centered. In
* general, if you just navigated the history, aIndex should be the index
* history was navigated to.
*/
void evictOutOfRangeContentViewers(in long aIndex);
/**
* Evict the content viewer associated with a bfcache entry

537
docshell/shistory/src/nsSHistory.cpp
View File

@ -72,12 +72,10 @@ using namespace mozilla;
#define PREF_SHISTORY_SIZE "browser.sessionhistory.max_entries"
#define PREF_SHISTORY_MAX_TOTAL_VIEWERS "browser.sessionhistory.max_total_viewers"
#define PREF_SHISTORY_OPTIMIZE_EVICTION "browser.sessionhistory.optimize_eviction"
static const char* kObservedPrefs[] = {
PREF_SHISTORY_SIZE,
PREF_SHISTORY_MAX_TOTAL_VIEWERS,
PREF_SHISTORY_OPTIMIZE_EVICTION,
nsnull
};
@ -90,16 +88,46 @@ static PRCList gSHistoryList;
// means we will calculate how many viewers to cache based on total memory
PRInt32 nsSHistory::sHistoryMaxTotalViewers = -1;
// Whether we should optimize the search for which entry to evict,
// by evicting older entries first. See entryLastTouched in
// nsSHistory::EvictGlobalContentViewer().
// NB: After 4.0, we should remove this option and the corresponding
// pref - optimization should always be used
static PRBool gOptimizeEviction = PR_FALSE;
// A counter that is used to be able to know the order in which
// entries were touched, so that we can evict older entries first.
static PRUint32 gTouchCounter = 0;
static PRLogModuleInfo* gLogModule = PR_LOG_DEFINE("nsSHistory");
#define LOG(format) PR_LOG(gLogModule, PR_LOG_DEBUG, format)
// This macro makes it easier to print a log message which includes a URI's
// spec. Example use:
//
// nsIURI *uri = [...];
// LOG_SPEC(("The URI is %s.", _spec), uri);
//
#define LOG_SPEC(format, uri) \
PR_BEGIN_MACRO \
if (PR_LOG_TEST(gLogModule, PR_LOG_DEBUG)) { \
nsCAutoString _specStr(NS_LITERAL_CSTRING("(null)"));\
if (uri) { \
uri->GetSpec(_specStr); \
} \
const char* _spec = _specStr.get(); \
LOG(format); \
} \
PR_END_MACRO
// This macro makes it easy to log a message including an SHEntry's URI.
// For example:
//
// nsCOMPtr<nsISHEntry> shentry = [...];
// LOG_SHENTRY_SPEC(("shentry %p has uri %s.", shentry.get(), _spec), shentry);
//
#define LOG_SHENTRY_SPEC(format, shentry) \
PR_BEGIN_MACRO \
if (PR_LOG_TEST(gLogModule, PR_LOG_DEBUG)) { \
nsCOMPtr<nsIURI> uri; \
shentry->GetURI(getter_AddRefs(uri)); \
LOG_SPEC(format, uri); \
} \
PR_END_MACRO
enum HistCmd{
HIST_CMD_BACK,
HIST_CMD_FORWARD,
@ -134,15 +162,60 @@ nsSHistoryObserver::Observe(nsISupports *aSubject, const char *aTopic,
{
if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
nsSHistory::UpdatePrefs();
nsSHistory::EvictGlobalContentViewer();
nsSHistory::GloballyEvictContentViewers();
} else if (!strcmp(aTopic, NS_CACHESERVICE_EMPTYCACHE_TOPIC_ID) ||
!strcmp(aTopic, "memory-pressure")) {
nsSHistory::EvictAllContentViewersGlobally();
nsSHistory::GloballyEvictAllContentViewers();
}
return NS_OK;
}
namespace {
already_AddRefed<nsIContentViewer>
GetContentViewerForTransaction(nsISHTransaction *aTrans)
{
nsCOMPtr<nsISHEntry> entry;
aTrans->GetSHEntry(getter_AddRefs(entry));
if (!entry) {
return nsnull;
}
nsCOMPtr<nsISHEntry> ownerEntry;
nsCOMPtr<nsIContentViewer> viewer;
entry->GetAnyContentViewer(getter_AddRefs(ownerEntry),
getter_AddRefs(viewer));
return viewer.forget();
}
void
EvictContentViewerForTransaction(nsISHTransaction *aTrans)
{
nsCOMPtr<nsISHEntry> entry;
aTrans->GetSHEntry(getter_AddRefs(entry));
nsCOMPtr<nsIContentViewer> viewer;
nsCOMPtr<nsISHEntry> ownerEntry;
entry->GetAnyContentViewer(getter_AddRefs(ownerEntry),
getter_AddRefs(viewer));
if (viewer) {
NS_ASSERTION(ownerEntry,
"Content viewer exists but its SHEntry is null");
LOG_SHENTRY_SPEC(("Evicting content viewer 0x%p for "
"owning SHEntry 0x%p at %s.",
viewer.get(), ownerEntry.get(), _spec), ownerEntry);
// Drop the presentation state before destroying the viewer, so that
// document teardown is able to correctly persist the state.
ownerEntry->SetContentViewer(nsnull);
ownerEntry->SyncPresentationState();
viewer->Destroy();
}
}
} // anonymous namespace
//*****************************************************************************
//*** nsSHistory: Object Management
//*****************************************************************************
@ -240,7 +313,6 @@ nsSHistory::UpdatePrefs()
Preferences::GetInt(PREF_SHISTORY_SIZE, &gHistoryMaxSize);
Preferences::GetInt(PREF_SHISTORY_MAX_TOTAL_VIEWERS,
&sHistoryMaxTotalViewers);
Preferences::GetBool(PREF_SHISTORY_OPTIMIZE_EVICTION, &gOptimizeEviction);
// If the pref is negative, that means we calculate how many viewers
// we think we should cache, based on total memory
if (sHistoryMaxTotalViewers < 0) {
@ -689,12 +761,12 @@ nsSHistory::GetListener(nsISHistoryListener ** aListener)
}
NS_IMETHODIMP
nsSHistory::EvictContentViewers(PRInt32 aPreviousIndex, PRInt32 aIndex)
nsSHistory::EvictOutOfRangeContentViewers(PRInt32 aIndex)
{
// Check our per SHistory object limit in the currently navigated SHistory
EvictWindowContentViewers(aPreviousIndex, aIndex);
EvictOutOfRangeWindowContentViewers(aIndex);
// Check our total limit across all SHistory objects
EvictGlobalContentViewer();
GloballyEvictContentViewers();
return NS_OK;
}
@ -703,7 +775,14 @@ nsSHistory::EvictAllContentViewers()
{
// XXXbz we don't actually do a good job of evicting things as we should, so
// we might have viewers quite far from mIndex. So just evict everything.
EvictContentViewersInRange(0, mLength);
nsCOMPtr<nsISHTransaction> trans = mListRoot;
while (trans) {
EvictContentViewerForTransaction(trans);
nsISHTransaction *temp = trans;
temp->GetNext(getter_AddRefs(trans));
}
return NS_OK;
}
@ -847,103 +926,78 @@ nsSHistory::ReloadCurrentEntry()
}
void
nsSHistory::EvictWindowContentViewers(PRInt32 aFromIndex, PRInt32 aToIndex)
nsSHistory::EvictOutOfRangeWindowContentViewers(PRInt32 aIndex)
{
// To enforce the per SHistory object limit on cached content viewers, we
// need to release all of the content viewers that are no longer in the
// "window" that now ends/begins at aToIndex. Existing content viewers
// should be in the window from
// aFromIndex - gHistoryMaxViewers to aFromIndex + gHistoryMaxViewers
// XXX rename method to EvictContentViewersExceptAroundIndex, or something.
// We need to release all content viewers that are no longer in the range
//
// We make the assumption that entries outside this range have no viewers so
// that we don't have to walk the whole entire session history checking for
// content viewers.
// aIndex - gHistoryMaxViewers to aIndex + gHistoryMaxViewers
//
// to ensure that this SHistory object isn't responsible for more than
// gHistoryMaxViewers content viewers. But our job is complicated by the
// fact that two transactions which are related by either hash navigations or
// history.pushState will have the same content viewer.
//
// To illustrate the issue, suppose gHistoryMaxViewers = 3 and we have four
// linked transactions in our history. Suppose we then add a new content
// viewer and call into this function. So the history looks like:
//
// A A A A B
// + *
//
// where the letters are content viewers and + and * denote the beginning and
// end of the range aIndex +/- gHistoryMaxViewers.
//
// Although one copy of the content viewer A exists outside the range, we
// don't want to evict A, because it has other copies in range!
//
// We therefore adjust our eviction strategy to read:
//
// Evict each content viewer outside the range aIndex -/+
// gHistoryMaxViewers, unless that content viewer also appears within the
// range.
//
// (Note that it's entirely legal to have two copies of one content viewer
// separated by a different content viewer -- call pushState twice, go back
// once, and refresh -- so we can't rely on identical viewers only appearing
// adjacent to one another.)
// This can happen on the first load of a page in a particular window
if (aFromIndex < 0 || aToIndex < 0) {
if (aIndex < 0) {
return;
}
NS_ASSERTION(aFromIndex < mLength, "aFromIndex is out of range");
NS_ASSERTION(aToIndex < mLength, "aToIndex is out of range");
if (aFromIndex >= mLength || aToIndex >= mLength) {
NS_ASSERTION(aIndex < mLength, "aIndex is out of range");
if (aIndex >= mLength) {
return;
}
// These indices give the range of SHEntries whose content viewers will be
// evicted
PRInt32 startIndex, endIndex;
if (aToIndex > aFromIndex) { // going forward
endIndex = aToIndex - gHistoryMaxViewers;
if (endIndex <= 0) {
return;
}
startIndex = NS_MAX(0, aFromIndex - gHistoryMaxViewers);
} else { // going backward
startIndex = aToIndex + gHistoryMaxViewers + 1;
if (startIndex >= mLength) {
return;
}
endIndex = NS_MIN(mLength, aFromIndex + gHistoryMaxViewers + 1);
}
// Calculate the range that's safe from eviction.
PRInt32 startSafeIndex = PR_MAX(0, aIndex - gHistoryMaxViewers);
PRInt32 endSafeIndex = PR_MIN(mLength, aIndex + gHistoryMaxViewers);
#ifdef DEBUG
LOG(("EvictOutOfRangeWindowContentViewers(index=%d), "
"mLength=%d. Safe range [%d, %d]",
aIndex, mLength, startSafeIndex, endSafeIndex));
// The content viewers in range aIndex -/+ gHistoryMaxViewers will not be
// evicted. Collect a set of them so we don't accidentally evict one of them
// if it appears outside this range.
nsCOMArray<nsIContentViewer> safeViewers;
nsCOMPtr<nsISHTransaction> trans;
GetTransactionAtIndex(startSafeIndex, getter_AddRefs(trans));
for (PRUint32 i = startSafeIndex; trans && i <= endSafeIndex; i++) {
nsCOMPtr<nsIContentViewer> viewer = GetContentViewerForTransaction(trans);
safeViewers.AppendObject(viewer);
nsISHTransaction *temp = trans;
temp->GetNext(getter_AddRefs(trans));
}
// Walk the SHistory list and evict any content viewers that aren't safe.
GetTransactionAtIndex(0, getter_AddRefs(trans));
// Walk the full session history and check that entries outside the window
// around aFromIndex have no content viewers
for (PRInt32 i = 0; trans && i < mLength; ++i) {
if (i < aFromIndex - gHistoryMaxViewers ||
i > aFromIndex + gHistoryMaxViewers) {
nsCOMPtr<nsISHEntry> entry;
trans->GetSHEntry(getter_AddRefs(entry));
nsCOMPtr<nsIContentViewer> viewer;
nsCOMPtr<nsISHEntry> ownerEntry;
entry->GetAnyContentViewer(getter_AddRefs(ownerEntry),
getter_AddRefs(viewer));
NS_WARN_IF_FALSE(!viewer,
"ContentViewer exists outside gHistoryMaxViewer range");
}
nsISHTransaction *temp = trans;
temp->GetNext(getter_AddRefs(trans));
}
#endif
EvictContentViewersInRange(startIndex, endIndex);
}
void
nsSHistory::EvictContentViewersInRange(PRInt32 aStart, PRInt32 aEnd)
{
nsCOMPtr<nsISHTransaction> trans;
GetTransactionAtIndex(aStart, getter_AddRefs(trans));
for (PRInt32 i = aStart; trans && i < aEnd; ++i) {
nsCOMPtr<nsISHEntry> entry;
trans->GetSHEntry(getter_AddRefs(entry));
nsCOMPtr<nsIContentViewer> viewer;
nsCOMPtr<nsISHEntry> ownerEntry;
entry->GetAnyContentViewer(getter_AddRefs(ownerEntry),
getter_AddRefs(viewer));
if (viewer) {
NS_ASSERTION(ownerEntry,
"ContentViewer exists but its SHEntry is null");
#ifdef DEBUG_PAGE_CACHE
nsCOMPtr<nsIURI> uri;
ownerEntry->GetURI(getter_AddRefs(uri));
nsCAutoString spec;
if (uri)
uri->GetSpec(spec);
printf("per SHistory limit: evicting content viewer: %s\n", spec.get());
#endif
// Drop the presentation state before destroying the viewer, so that
// document teardown is able to correctly persist the state.
ownerEntry->SetContentViewer(nsnull);
ownerEntry->SyncPresentationState();
viewer->Destroy();
while (trans) {
nsCOMPtr<nsIContentViewer> viewer = GetContentViewerForTransaction(trans);
if (safeViewers.IndexOf(viewer) == -1) {
EvictContentViewerForTransaction(trans);
}
nsISHTransaction *temp = trans;
@ -951,134 +1005,149 @@ nsSHistory::EvictContentViewersInRange(PRInt32 aStart, PRInt32 aEnd)
}
}
// static
void
nsSHistory::EvictGlobalContentViewer()
namespace {
class TransactionAndDistance
{
// true until the total number of content viewers is <= total max
// The usual case is that we only need to evict one content viewer.
// However, if somebody resets the pref value, we might occasionally
// need to evict more than one.
PRBool shouldTryEviction = PR_TRUE;
while (shouldTryEviction) {
// Walk through our list of SHistory objects, looking for content
// viewers in the possible active window of all of the SHEntry objects.
// Keep track of the SHEntry object that has a ContentViewer and is
// farthest from the current focus in any SHistory object. The
// ContentViewer associated with that SHEntry will be evicted
PRInt32 distanceFromFocus = 0;
PRUint32 candidateLastTouched = 0;
nsCOMPtr<nsISHEntry> evictFromSHE;
nsCOMPtr<nsIContentViewer> evictViewer;
PRInt32 totalContentViewers = 0;
nsSHistory* shist = static_cast<nsSHistory*>
(PR_LIST_HEAD(&gSHistoryList));
while (shist != &gSHistoryList) {
// Calculate the window of SHEntries that could possibly have a content
// viewer. There could be up to gHistoryMaxViewers content viewers,
// but we don't know whether they are before or after the mIndex position
// in the SHEntry list. Just check both sides, to be safe.
PRInt32 startIndex = NS_MAX(0, shist->mIndex - gHistoryMaxViewers);
PRInt32 endIndex = NS_MIN(shist->mLength - 1,
shist->mIndex + gHistoryMaxViewers);
nsCOMPtr<nsISHTransaction> trans;
shist->GetTransactionAtIndex(startIndex, getter_AddRefs(trans));
public:
TransactionAndDistance(nsISHTransaction *aTrans, PRUint32 aDist)
: mTransaction(aTrans)
, mDistance(aDist)
{
mViewer = GetContentViewerForTransaction(aTrans);
NS_ASSERTION(mViewer, "Transaction should have a content viewer");
for (PRInt32 i = startIndex; trans && i <= endIndex; ++i) {
nsCOMPtr<nsISHEntry> entry;
trans->GetSHEntry(getter_AddRefs(entry));
nsCOMPtr<nsIContentViewer> viewer;
nsCOMPtr<nsISHEntry> ownerEntry;
entry->GetAnyContentViewer(getter_AddRefs(ownerEntry),
getter_AddRefs(viewer));
nsCOMPtr<nsISHEntry> shentry;
mTransaction->GetSHEntry(getter_AddRefs(shentry));
PRUint32 entryLastTouched = 0;
if (gOptimizeEviction) {
nsCOMPtr<nsISHEntryInternal> entryInternal = do_QueryInterface(entry);
if (entryInternal) {
// Find when this entry was last activated
entryInternal->GetLastTouched(&entryLastTouched);
}
}
#ifdef DEBUG_PAGE_CACHE
nsCOMPtr<nsIURI> uri;
if (ownerEntry) {
ownerEntry->GetURI(getter_AddRefs(uri));
} else {
entry->GetURI(getter_AddRefs(uri));
}
nsCAutoString spec;
if (uri) {
uri->GetSpec(spec);
printf("Considering for eviction: %s\n", spec.get());
}
#endif
// This SHEntry has a ContentViewer, so check how far away it is from
// the currently used SHEntry within this SHistory object
if (viewer) {
PRInt32 distance = NS_ABS(shist->mIndex - i);
#ifdef DEBUG_PAGE_CACHE
printf("Has a cached content viewer: %s\n", spec.get());
printf("mIndex: %d i: %d\n", shist->mIndex, i);
#endif
totalContentViewers++;
// If this entry is further away from focus than any previously found
// or at the same distance but it is longer time since it was activated
// then take this entry as the new candiate for eviction
if (distance > distanceFromFocus || (distance == distanceFromFocus && candidateLastTouched > entryLastTouched)) {
#ifdef DEBUG_PAGE_CACHE
printf("Choosing as new eviction candidate: %s\n", spec.get());
#endif
candidateLastTouched = entryLastTouched;
distanceFromFocus = distance;
evictFromSHE = ownerEntry;
evictViewer = viewer;
}
}
nsISHTransaction* temp = trans;
temp->GetNext(getter_AddRefs(trans));
}
shist = static_cast<nsSHistory*>(PR_NEXT_LINK(shist));
}
#ifdef DEBUG_PAGE_CACHE
printf("Distance from focus: %d\n", distanceFromFocus);
printf("Total max viewers: %d\n", sHistoryMaxTotalViewers);
printf("Total number of viewers: %d\n", totalContentViewers);
#endif
if (totalContentViewers > sHistoryMaxTotalViewers && evictViewer) {
#ifdef DEBUG_PAGE_CACHE
nsCOMPtr<nsIURI> uri;
evictFromSHE->GetURI(getter_AddRefs(uri));
nsCAutoString spec;
if (uri) {
uri->GetSpec(spec);
printf("Evicting content viewer: %s\n", spec.get());
}
#endif
// Drop the presentation state before destroying the viewer, so that
// document teardown is able to correctly persist the state.
evictFromSHE->SetContentViewer(nsnull);
evictFromSHE->SyncPresentationState();
evictViewer->Destroy();
// If we only needed to evict one content viewer, then we are done.
// Otherwise, continue evicting until we reach the max total limit.
if (totalContentViewers - sHistoryMaxTotalViewers == 1) {
shouldTryEviction = PR_FALSE;
}
nsCOMPtr<nsISHEntryInternal> shentryInternal = do_QueryInterface(shentry);
if (shentryInternal) {
shentryInternal->GetLastTouched(&mLastTouched);
} else {
// couldn't find a content viewer to evict, so we are done
shouldTryEviction = PR_FALSE;
NS_WARNING("Can't cast to nsISHEntryInternal?");
mLastTouched = 0;
}
} // while shouldTryEviction
}
bool operator<(const TransactionAndDistance &aOther) const
{
// Compare distances first, and fall back to last-accessed times.
if (aOther.mDistance != this->mDistance) {
return this->mDistance < aOther.mDistance;
}
return this->mLastTouched < aOther.mLastTouched;
}
bool operator==(const TransactionAndDistance &aOther) const
{
// This is a little silly; we need == so the default comaprator can be
// instantiated, but this function is never actually called when we sort
// the list of TransactionAndDistance objects.
return aOther.mDistance == this->mDistance &&
aOther.mLastTouched == this->mLastTouched;
}
nsCOMPtr<nsISHTransaction> mTransaction;
nsCOMPtr<nsIContentViewer> mViewer;
PRUint32 mLastTouched;
PRInt32 mDistance;
};
} // anonymous namespace
//static
void
nsSHistory::GloballyEvictContentViewers()
{
// First, collect from each SHistory object the transactions which have a
// cached content viewer. Associate with each transaction its distance from
// its SHistory's current index.
nsTArray<TransactionAndDistance> transactions;
nsSHistory *shist = static_cast<nsSHistory*>(PR_LIST_HEAD(&gSHistoryList));
while (shist != &gSHistoryList) {
// Maintain a list of the transactions which have viewers and belong to
// this particular shist object. We'll add this list to the global list,
// |transactions|, eventually.
nsTArray<TransactionAndDistance> shTransactions;
// Content viewers are likely to exist only within shist->mIndex -/+
// gHistoryMaxViewers, so only search within that range.
//
// A content viewer might exist outside that range due to either:
//
// * history.pushState or hash navigations, in which case a copy of the
// content viewer should exist within the range, or
//
// * bugs which cause us not to call nsSHistory::EvictContentViewers()
// often enough. Once we do call EvictContentViewers() for the
// SHistory object in question, we'll do a full search of its history
// and evict the out-of-range content viewers, so we don't bother here.
//
PRInt32 startIndex = NS_MAX(0, shist->mIndex - gHistoryMaxViewers);
PRInt32 endIndex = NS_MIN(shist->mLength - 1,
shist->mIndex + gHistoryMaxViewers);
nsCOMPtr<nsISHTransaction> trans;
shist->GetTransactionAtIndex(startIndex, getter_AddRefs(trans));
for (PRInt32 i = startIndex; trans && i <= endIndex; i++) {
nsCOMPtr<nsIContentViewer> contentViewer =
GetContentViewerForTransaction(trans);
if (contentViewer) {
// Because one content viewer might belong to multiple SHEntries, we
// have to search through shTransactions to see if we already know
// about this content viewer. If we find the viewer, update its
// distance from the SHistory's index and continue.
PRBool found = PR_FALSE;
for (PRUint32 j = 0; j < shTransactions.Length(); j++) {
TransactionAndDistance &container = shTransactions[j];
if (container.mViewer == contentViewer) {
container.mDistance = PR_MIN(container.mDistance,
PR_ABS(i - shist->mIndex));
found = PR_TRUE;
break;
}
}
// If we didn't find a TransactionAndDistance for this content viewer, make a new
// one.
if (!found) {
TransactionAndDistance container(trans, PR_ABS(i - shist->mIndex));
shTransactions.AppendElement(container);
}
}
nsISHTransaction *temp = trans;
temp->GetNext(getter_AddRefs(trans));
}
// We've found all the transactions belonging to shist which have viewers.
// Add those transactions to our global list and move on.
transactions.AppendElements(shTransactions);
shist = static_cast<nsSHistory*>(PR_NEXT_LINK(shist));
}
// We now have collected all cached content viewers. First check that we
// have enough that we actually need to evict some.
if ((PRInt32)transactions.Length() <= sHistoryMaxTotalViewers) {
return;
}
// If we need to evict, sort our list of transactions and evict the largest
// ones. (We could of course get better algorithmic complexity here by using
// a heap or something more clever. But sHistoryMaxTotalViewers isn't large,
// so let's not worry about it.)
transactions.Sort();
for (PRInt32 i = transactions.Length() - 1;
i >= sHistoryMaxTotalViewers; --i) {
EvictContentViewerForTransaction(transactions[i].mTransaction);
}
}
nsresult
@ -1106,21 +1175,13 @@ nsSHistory::EvictExpiredContentViewerForEntry(nsIBFCacheEntry *aEntry)
if (i > endIndex)
return NS_OK;
NS_ASSERTION(i != mIndex, "How did the current session entry expire?");
if (i == mIndex)
if (i == mIndex) {
NS_WARNING("How did the current SHEntry expire?");
return NS_OK;
// We evict content viewers for the expired entry and any other entries that
// we would have to go through the expired entry to get to (i.e. the entries
// that have the expired entry between them and the current entry). Those
// other entries should have timed out already, actually, but this is just
// to be on the safe side.
if (i < mIndex) {
EvictContentViewersInRange(startIndex, i + 1);
} else {
EvictContentViewersInRange(i, endIndex + 1);
}
EvictContentViewerForTransaction(trans);
return NS_OK;
}
@ -1131,11 +1192,11 @@ nsSHistory::EvictExpiredContentViewerForEntry(nsIBFCacheEntry *aEntry)
//static
void
nsSHistory::EvictAllContentViewersGlobally()
nsSHistory::GloballyEvictAllContentViewers()
{
PRInt32 maxViewers = sHistoryMaxTotalViewers;
sHistoryMaxTotalViewers = 0;
EvictGlobalContentViewer();
GloballyEvictContentViewers();
sHistoryMaxTotalViewers = maxViewers;
}

11
docshell/shistory/src/nsSHistory.h
View File

@ -101,12 +101,11 @@ protected:
nsresult PrintHistory();
#endif
// Evict the viewers at indices between aStartIndex and aEndIndex,
// including aStartIndex but not aEndIndex.
void EvictContentViewersInRange(PRInt32 aStartIndex, PRInt32 aEndIndex);
void EvictWindowContentViewers(PRInt32 aFromIndex, PRInt32 aToIndex);
static void EvictGlobalContentViewer();
static void EvictAllContentViewersGlobally();
// Evict content viewers in this window which don't lie in the "safe" range
// around aIndex.
void EvictOutOfRangeWindowContentViewers(PRInt32 aIndex);
static void GloballyEvictContentViewers();
static void GloballyEvictAllContentViewers();
// Calculates a max number of total
// content viewers to cache, based on amount of total memory

20
docshell/test/chrome/bug396519_window.xul
View File

@ -50,6 +50,9 @@
const LISTEN_EVENTS = ["pageshow"];
const Cc = Components.classes;
const Ci = Components.interfaces;
var gBrowser;
var gTestCount = 0;
var gTestsIterator;
@ -96,6 +99,23 @@
QueryInterface(Components.interfaces.nsISHEntry);
is(!!shEntry.contentViewer, gExpected[i], "content viewer "+i+", test "+gTestCount);
}
// Make sure none of the SHEntries share bfcache entries with one
// another.
for (var i = 0; i < history.count; i++) {
for (var j = 0; j < history.count; j++) {
if (j == i)
continue;
let shentry1 = history.getEntryAtIndex(i, false)
.QueryInterface(Ci.nsISHEntry);
let shentry2 = history.getEntryAtIndex(j, false)
.QueryInterface(Ci.nsISHEntry);
ok(!shentry1.sharesDocumentWith(shentry2),
'Test ' + gTestCount + ': shentry[' + i + "] shouldn't " +
"share document with shentry[" + j + ']');
}
}
}
else {
is(history.count, gExpected.length, "Wrong history length in test "+gTestCount);

2
layout/base/nsDocumentViewer.cpp
View File

@ -1980,7 +1980,7 @@ DocumentViewerImpl::Show(void)
printf("About to evict content viewers: prev=%d, loaded=%d\n",
prevIndex, loadedIndex);
#endif
historyInt->EvictContentViewers(prevIndex, loadedIndex);
historyInt->EvictOutOfRangeContentViewers(loadedIndex);
}
}
}

1
mobile/app/mobile.js
View File

@ -130,7 +130,6 @@ pref("browser.display.remotetabs.timeout", 10);
/* session history */
pref("browser.sessionhistory.max_total_viewers", 1);
pref("browser.sessionhistory.max_entries", 50);
pref("browser.sessionhistory.optimize_eviction", true);
/* session store */
pref("browser.sessionstore.resume_session_once", false);

2
modules/libpref/src/init/all.js
View File

@ -109,8 +109,6 @@ pref("dom.enable_performance", true);
// of content viewers to cache based on the amount of available memory.
pref("browser.sessionhistory.max_total_viewers", -1);
pref("browser.sessionhistory.optimize_eviction", true);
pref("ui.use_native_colors", true);
pref("ui.click_hold_context_menus", false);
pref("browser.display.use_document_fonts", 1); // 0 = never, 1 = quick, 2 = always