I have an app that used a lot CoreGraphics and by using
"UIGraphicsGetCurrentContext()" and "CGContextDrawImage" and etc
CoreGraphics founctions, these functions call mmap() and these use a lot
virtual memory.
The problem is when I receive low memory warning, the memory used
by mmap() in virtual memory will not release automaticly, and I don't
have a way to manually release them. The app crash due to the virtual
memory pressure, my real RAM usage is very low. How can I manually
release the mmap() memory created by CoreGraphics? Thx
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