[Okular-devel] [Bug 291129] Okular easily occupies huge memory after scrolling in pdf files

[Benni Hill]

https://bugs.kde.org/show_bug.cgi?id=291129

Benni Hill <benni at mytum.de> changed:

           What    |Removed                     |Added
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                 CC|                            |benni at mytum.de

--- Comment #14 from Benni Hill <benni at mytum.de> ---
Hi,

I think I found a bug in DocumentPrivate::getFreeMemory().
I was programming on Gwenview which has a copied version of this function in
its code.

When writing the output of getFreeMemory() to stdout via qDebug() I sometimes
get values like 18446744073694777344 which suggest that there is an integer
underflow. Here is an excerpt from cat /proc/meminfo shortly after that
happened:
MemTotal:        2824516 kB
MemFree:          277580 kB
Buffers:           10292 kB
Cached:           169928 kB
SwapCached:        32984 kB
Active:          1733572 kB
Inactive:         546212 kB
Active(anon):    1663072 kB
Inactive(anon):   468348 kB
Active(file):      70500 kB
Inactive(file):    77864 kB
Unevictable:       11316 kB
Mlocked:           11316 kB
SwapTotal:       7814140 kB
SwapFree:        7334064 kB

When I understand the function properly it is calculation the free memory as:
MemFree + Buffers + Cached + SwapFree - SwapTotal
which in this case would result in a negative value of -22 276 kB which can't
be returned as qulonglong.

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