Add mmap (memory map) support

Packages describing “mmap” as local USE flag

Package “mmap” Flag Description
www-servers/lighttpd Use mmap with files owned by lighttpd. This is a dangerous option as it may allow local users to trigger SIGBUS crashes.
media-libs/xine-lib Use mmap() function while reading file from local disks. Using mmap() will use more virtual memory space, but leaves to the Kernel the task of caching the file's data. mmap() access should be faster, but might misbehave if the device where the file resides in is removed during playback.

All packages providing a “mmap” USE flag (4)