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SubjectRe: do_mmap()

> If the vm area is LOCKED in core e.g. for realtime purposes, it will touch
> any of the pages by reading a byte from them.
> IMHO, this is not strictly true, it should touch the pages by _writing_ ,
> as this makes a difference on zero pages:
> imagine a realtime process that has malloced a large chunk (with a mmap
> based malloc), mlocks it, and then uses it - if memory is tight, it will
> nevertheless cause swapping activity, which is what it wanted to prevent
> by mlocking it.

Writing isn't correct either in case of read-only pages. Solution is


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