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    SubjectRe: [PATCH 5/5] proc: export more page flags in /proc/kpageflags

    * Pekka Enberg <> wrote:

    > I have no idea how expensive tracepoints are but I suspect they
    > don't make too much sense for this particular scenario. After all,
    > kmemtrace is mainly interested in _allocation patterns_ whereas
    > this patch seems to be more interested in "memory layout" type of
    > things.

    My point is that the allocation patterns can be derived from dynamic
    events. We can build a map of everything if we know all the events
    that led up to it. Doing:

    echo 3 > /proc/sys/vm/drop_caches

    will clear 99% of the memory allocations, so we can build a new map
    from scratch just about anytime. (and if boot allocations are
    interesting they can be traced too)

    _And_ via this angle we'll also have access to the dynamic events,
    in a different 'view' of the same tracepoints - which is obviously
    very useful for different purposes.


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