Bernd Schmidt <[EMAIL PROTECTED]> wrote: > 1. munmap can now unmap subparts of previously allocated blocks. This > makes behaviour more consistent with mmu Linux, and allows us to > simplify and speed up the uClibc malloc implementation.
There's a problem with your alteration to do_munmap() to split VMAs. What happens if an area of a file is mmap'd twice in a process? Consider the situation where two independent parts of a process (say two different libraries) each map an area of the same file. do_mmap_pgoff() will attempt to share these regions if it can. This can lead to you splitting the wrong VMA when someone comes along later to do an apparent partial unmap. I'm currently working on something to give each NOMMU process its own list VMAs rather than holding them in common. This is so that I can add VMA reservation (and more to the point, unreservation) which'll make some stuff easier. David - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
