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    SubjectRe: [PATCH 0/3] x86: add cpuset_scnprintf function

    > However doing this is worse in my view than simply breaking the format
    > outright, unilaterally and irrevocably. If you just flat out stick a
    > fork in an API and break it hard on some release, then at least user
    > space knows that it must adapt or die at that version. If you hand
    > user space the means to break that API, then any properly and
    > defensively written user code has to be prepared to deal with both API
    > flavors, and the majority of user space code is broken half the time,
    > when run on a system with the API variant it wasn't expecting. More
    > over, you end up with apps having "toilet seat wars" with each other:
    > you left it up and it should be down; no you left it down and it should
    > be up. Not a pretty sight.
    > Perhaps I totally misunderstand this patchset ?


    I wanted to not break current apps unmercifully, but perhaps I should
    default it to the "non-compatible" mode (and adjust the schedstat version
    to indicate this)? [It's the only output that I found that seemed to care.]

    And if users have apps that they can't convert, they can revert to the
    "old" (compatible) method of outputs. I know if I'm a user and I'm really
    interested in understanding the outputs when there's hundreds and hundreds
    of cpus, then the more compact format is much more useful.

    I can't believe there hasn't been many changes in all of these outputs.
    Like what happened before Hyperthreading, or 3rd level caches, or ?
    Even the new Intel announcements for Nehalem may introduce more changes
    in what's important in the output information. Plus I was under the
    impression that one of the basic tenets of Linux was that API's can and
    will change?


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