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    SubjectRe: [PATCH] tracer for sys_open() - sreadahead
    From
    2009/1/29 Ingo Molnar <mingo@elte.hu>:
    >
    > * Frédéric Weisbecker <fweisbec@gmail.com> wrote:
    >
    >> 2009/1/29 Ingo Molnar <mingo@elte.hu>:
    >> >>
    >> >> Several people talked me about utrace and gave some examples about it in
    >> >> this discussion. The Api is very convenient to fetch syscall numbers,
    >> >> arguments and return values. And the hooks are done in the generic core
    >> >> code, so it is arch independent.
    >> >>
    >> >> The only drawback I can see is that it is not yet merged upstream, in
    >> >> need of in-kernel users. If it only depends on this condition, we could
    >> >> be these users...
    >> >>
    >> >> What do you think?
    >> >
    >> > sure - how do the minimal bits/callbacks look like which enable syscall
    >> > tracing?
    >> >
    >> > Ingo
    >>
    >>
    >> There is a very straightforward example provided by Ananth in there:
    >> http://lkml.org/lkml/2009/1/28/59
    >
    > I mean, how does the infrastructure patch look like - what code does this
    > add to the kernel - just to get the syscall tracing bits. Lets get some
    > progress here - it's clear that tracing syscalls is good, we just need to
    > do it and look at actual patches.
    >
    > Ingo
    >

    The latest snapshot version I've found is here:
    http://people.redhat.com/roland/utrace/2.6-current/utrace.patch
    This is mostly independent core code and a good number of hooks inside ptrace.

    But I don't know much about the overhead it potentially brings on ptrace.
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