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    SubjectRe: [PATCH 2.6.14-rc2] fix incorrect mm->hiwater_vm and mm->hiwater_rss
    Hugh Dickins wrote:
    > On Wed, 21 Sep 2005, Jay Lan wrote:
    >
    >>Hugh Dickins wrote:
    >>
    >>>4. If you've noticed a regression, you must be one of the elite that
    >>>knows
    >>>what these counters are used for: nothing in the kernel.org tree does.
    >>>Please add a comment saying what it is that uses them and how, so
    >>>developers can make better judgements about how best to maintain them.
    >>>
    >>>5. Please add appropriate CONFIG, dummy macros etc., so that no time
    >>>is wasted on these updates in all the vanilla systems which have no
    >>>interest in them - but maybe Christoph already has that well in hand.
    >>
    >>It is used in enhanced system accounting. An obvious CONFIG would be
    >>CONFIG_BSD_PROCESS_ACCT.
    >>
    >>However, since the CONFIG flag is almost always Yes, people would need
    >>to turn it off if they do not want system accounting. Would that be
    >>OK?
    >
    >
    > Christoph will know the issue better than I. But I'd say no, that's
    > not OK. You have some out of tree "enhanced system accounting" which
    > has been granted the privilege of hooks within the mainline kernel:
    > they should be disabled unless a CONFIG option is switched on, which
    > your accounting patch can do. And the (mainline) Kconfig help entry
    > for that CONFIG option should point us to the source of your package.

    It is not really an issue of out-of-tree accounting package. The
    system accounting is based on very old technology and needs improvement.
    The issue we face is not an issue of one particular accounting package.

    I think the best approach would be to wrap the mm usage accounting
    in a new CONFIG_ENHANCED_SYS_ACCT and leave it OFF by default so that
    people can still get the minimal accounting with
    CONFIG_BSD_PROCESS_ACCT.

    - jay

    >
    > Hugh
    > -
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