Re: [discuss] [PATCH] Inconsistent mmap()/mremap() flags

Andi Kleen
2007-10-02T13:45:44Z

> First call mmap with a low hint address, the new size you'll be wanting
> from the mremap, PROT_NONE, MAP_ANONYMOUS, -1, 0. Then call mremap with
> old address, old size, new size, MREMAP_MAYMOVE|MREMAP_FIXED, and new
> address as returned by the preparatory mmap.

That's racy unfortunately in a multithreaded process. They would need to loop.

-Andi