Re: [patch 2/3] MAP_NOZERO - implement sys_brk2()

[Ulrich Drepper]

On 6/26/07, Davide Libenzi <davidel@xxxxxxxxxxxxxxx> wrote:
> I acutally have the code for it, but I never posted it since it did not
> receive a too warm review (and the only user was the fdmap thingy).

Only user of sys_indirect?  There will be quite a few right away.
Every syscall that returns a file descriptor needs O_CLOEXEC support
(socket, pipe, epoll_create, ...)


> OTOH glibc could implement __morecore using mmap(MAP_NOZERO), and hence
> brk2() would not be needed, no?

No.  mmap calls create individual VMAs which gets expensive.  There
are also some hardware drivers which get more expensive the more VMAs
there are.  I want to go away as much as possible from mmap for
malloc.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/