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    SubjectRe: [PATCH 0/2] utrace
    On Wed, Aug 27, 2008 at 09:54:53AM -0400, Christoph Hellwig wrote:
    > On Tue, Aug 26, 2008 at 08:17:12PM -0400, Frank Ch. Eigler wrote:
    > > Among others, utrace is an enablement layer for systemtap user-space
    > > probing, through another subsequent part that implements a
    > > kprobes-like API for user-space tasks. All this code now exists in at
    > > least prototype form, so if you need to see the bigger picture, look
    > > that way. Other users are anticipated, but first we need to get past
    > > the chicken-and-egg.
    > As usual nothing of that stuff has any real in-kernel users so the same
    > argument applies here. If it did have real uses it could be merged at
    > the same time. But the current uprobes mess is not a reason to merge
    > utrace.

    Uprobes is just one user of utrace. It is intended for use for simple
    tracing where we need a kernel+userspace look at the problem at hand.
    The intention is for use in simple cases (when condition x is met, what
    is the value of variable y, etc).

    For more advanced tracing though, there are other ideas being proposed
    (see ntrace discussions on utrace-devel, but I guess now lkml is the
    right place for that discussion too).

    However, there are components of uprobes such as breakpoint
    insertion/removal and single-stepping infrastructure that are
    potentially useful to other userspace debuggers. We are working on
    factoring those out to live independent of uprobes. You should be seeing
    those patches soon.


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