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    SubjectRe: [PATCH 1/2] x86: Cleanup TIF value gaps in shift range
    On Mon, 18 Oct 2010, Thomas Gleixner wrote:

    > I agree in general, but this is stupid as hell. No fcking interface
    > should exposed kernel internal flag bits just as hex values and no
    > fcking luser space should rely on it to be a subject of no change.
    > Seriously, if we can't even change TIF_* bits anymore then we are
    > doing something wrong. That's a pure kernel internal affair and
    > subject to change.

    I agree, and when I added them to the show_state() dumps, I should have
    probably enumerated the bits of interest to userspace and printed them
    much like taint flags: use 'M' for my bit of interest, TIF_MEMDIE, which
    gives access to memory reserves. We care a _lot_ about detecting hung
    tasks that have that bit set because it usually indicates a VM problem
    where we've allowed complete depletion of memory reserves. There's no
    other way to detect that, so we need to export TIF_MEMDIE somehow and if
    that's by doing (ti->flags & TIF_MEMDIE) ? "M" : "" then that's fine by
    me. I hope we can do that before changing its value, though.

     \ /
      Last update: 2010-10-18 23:33    [W:0.021 / U:9.532 seconds]
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