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Better memory limit tuning in greedy mode to avoid triggering the OOM if swap is full

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Using Albert's new formula
This commit is contained in:
Fabio D'Urso 2012-06-24 20:35:37 +02:00
parent 0e01e11717
commit 3c2d2e1b7a
2 changed files with 21 additions and 5 deletions
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24
core/document.cpp
View file

@ -178,6 +178,8 @@ void DocumentPrivate::cleanupPixmapMemory( qulonglong /*sure? bytesOffset*/ )
// [MEM] choose memory parameters based on configuration profile
qulonglong clipValue = 0;
qulonglong memoryToFree = 0;
qulonglong freeSwap;
switch ( Settings::memoryLevel() )
{
case Settings::EnumMemoryLevel::Low:
@ -187,7 +189,7 @@ void DocumentPrivate::cleanupPixmapMemory( qulonglong /*sure? bytesOffset*/ )
case Settings::EnumMemoryLevel::Normal:
{
qulonglong thirdTotalMemory = getTotalMemory() / 3;
qulonglong freeMemory = getFreeMemory();
qulonglong freeMemory = getFreeMemory( &freeSwap );
if (m_allocatedPixmapsTotalMemory > thirdTotalMemory) memoryToFree = m_allocatedPixmapsTotalMemory - thirdTotalMemory;
if (m_allocatedPixmapsTotalMemory > freeMemory) clipValue = (m_allocatedPixmapsTotalMemory - freeMemory) / 2;
}
@ -195,13 +197,14 @@ void DocumentPrivate::cleanupPixmapMemory( qulonglong /*sure? bytesOffset*/ )
case Settings::EnumMemoryLevel::Aggressive:
{
qulonglong freeMemory = getFreeMemory();
qulonglong freeMemory = getFreeMemory( &freeSwap );
if (m_allocatedPixmapsTotalMemory > freeMemory) clipValue = (m_allocatedPixmapsTotalMemory - freeMemory) / 2;
}
break;
case Settings::EnumMemoryLevel::Greedy:
{
const qulonglong memoryLimit = qMax(getFreeMemory(), getTotalMemory() / 2);
qulonglong freeMemory = getFreeMemory( &freeSwap );
const qulonglong memoryLimit = qMin( qMax( freeMemory, getTotalMemory()/2 ), freeMemory+freeSwap );
if (m_allocatedPixmapsTotalMemory > memoryLimit) clipValue = (m_allocatedPixmapsTotalMemory - memoryLimit) / 2;
}
break;
@ -279,13 +282,21 @@ qulonglong DocumentPrivate::getTotalMemory()
return (cachedValue = 134217728);
}
qulonglong DocumentPrivate::getFreeMemory()
qulonglong DocumentPrivate::getFreeMemory( qulonglong *freeSwap )
{
static QTime lastUpdate = QTime::currentTime().addSecs(-3);
static qulonglong cachedValue = 0;
static qulonglong cachedFreeSwap = 0;
if ( qAbs( lastUpdate.secsTo( QTime::currentTime() ) ) <= 2 )
{
*freeSwap = cachedFreeSwap;
return cachedValue;
}
/* Initialize the returned free swap value to 0. It is overwritten if the
* actual value is available */
*freeSwap = 0;
#if defined(Q_OS_LINUX)
// if /proc/meminfo doesn't exist, return MEMORY FULL
@ -320,6 +331,9 @@ qulonglong DocumentPrivate::getFreeMemory()
found = found && foundValues[i];
if ( found )
{
/* MemFree + Buffers + Cached - SwapUsed =
* = MemFree + Buffers + Cached - (SwapTotal - SwapFree) =
* = MemFree + Buffers + Cached + SwapFree - SwapTotal */
memoryFree = values[0] + values[1] + values[2] + values[3];
if ( values[4] > memoryFree )
memoryFree = 0;
@ -333,6 +347,7 @@ qulonglong DocumentPrivate::getFreeMemory()
lastUpdate = QTime::currentTime();
*freeSwap = ( cachedFreeSwap = (Q_UINT64_C(1024) * values[3]) );
return ( cachedValue = (Q_UINT64_C(1024) * memoryFree) );
#elif defined(Q_OS_FREEBSD)
qulonglong cache, inact, free, psize;
@ -361,6 +376,7 @@ qulonglong DocumentPrivate::getFreeMemory()
lastUpdate = QTime::currentTime();
*freeSwap = ( cachedFreeSwap = stat.ullAvailPageFile );
return ( cachedValue = stat.ullAvailPhys );
#else
// tell the memory is full.. will act as in LOW profile

2
core/document_p.h
View file

@ -98,7 +98,7 @@ class DocumentPrivate
void cleanupPixmapMemory( qulonglong bytesOffset = 0 );
void calculateMaxTextPages();
qulonglong getTotalMemory();
qulonglong getFreeMemory();
qulonglong getFreeMemory( qulonglong *freeSwap );
void loadDocumentInfo();
void loadDocumentInfo( const QString &fileName );
void loadViewsInfo( View *view, const QDomElement &e );