[openib-general] Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation

[Roland Dreier]

    Libor>   Do you mean that the set/clear parameters to do_mlock()
    Libor> are the actual flags which are set/cleared by the caller? 
    Libor> Also, the issue remains that the flags are not reference
    Libor> counted which is a problem if you are dealing with
    Libor> overlapping memory region, or even if one region ends and
    Libor> another begins on the same page. Since the desire is to be
    Libor> able to pin any memory that a user can malloc this is a
    Libor> likely scenario.

Good point... we need to figure out how to handle:

    a) app registers 0x0000 through 0x17ff
    b) app registers 0x1800 through 0x2fff
    c) app unregisters 0x0000 through 0x17ff
    d) the page at 0x1000 must stay pinned

hmm...

 - R.