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fix: grow pixmapcache if it is evicting too fast

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Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>
This commit is contained in:
Rachel Powers 2023-05-04 23:47:27 -07:00
parent ed185f047f
commit fd7338d3f3
1 changed files with 41 additions and 0 deletions
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41
launcher/MTPixmapCache.h
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@ -3,6 +3,8 @@
#include <QCoreApplication>
#include <QPixmapCache>
#include <QThread>
#include <QTime>
#include <QDebug>
#define GET_TYPE() \
Qt::ConnectionType type; \
@ -60,6 +62,8 @@ class PixmapCache final : public QObject {
DEFINE_FUNC_ONE_PARAM(remove, bool, const QPixmapCache::Key&)
DEFINE_FUNC_TWO_PARAM(replace, bool, const QPixmapCache::Key&, const QPixmap&)
DEFINE_FUNC_ONE_PARAM(setCacheLimit, bool, int)
DEFINE_FUNC_NO_PARAM(markCacheMissByEviciton, bool)
DEFINE_FUNC_ONE_PARAM(setFastEvictionThreshold, bool, int)
// NOTE: Every function returns something non-void to simplify the macros.
private slots:
@ -90,6 +94,43 @@ class PixmapCache final : public QObject {
return true;
}
/**
* Mark that a cach miss occured because of a eviciton if too man of these occure to fast the cache size is increased
* @return if the cache size was increased
*/
bool _markCacheMissByEviciton()
{
auto now = QTime::currentTime();
if (!m_last_cache_miss_by_eviciton.isNull()) {
auto diff = m_last_cache_miss_by_eviciton.msecsTo(now);
if (diff < 1000) { // less than a second ago
++m_consecutive_fast_evicitons;
} else {
m_consecutive_fast_evicitons = 0;
}
}
m_last_cache_miss_by_eviciton = now;
if (m_consecutive_fast_evicitons >= m_consecutive_fast_evicitons_threshold) {
// double the cache size
auto newSize = _cacheLimit() * 2;
qDebug() << m_consecutive_fast_evicitons << "pixmap cache misses by eviction happened too fast, doubling cache size to"
<< newSize;
_setCacheLimit(newSize);
m_consecutive_fast_evicitons = 0;
return true;
}
return false;
}
bool _setFastEvictionThreshold(int threshold)
{
m_consecutive_fast_evicitons_threshold = threshold;
return true;
}
private:
static PixmapCache* s_instance;
QTime m_last_cache_miss_by_eviciton;
int m_consecutive_fast_evicitons = 0;
int m_consecutive_fast_evicitons_threshold = 15;
};