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    SubjectRe: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes
    On Thu, Jan 14, 2010 at 12:23:11PM +0100, Peter Zijlstra wrote:
    > On Mon, 2010-01-11 at 17:56 +0530, Srikar Dronamraju wrote:
    > > This patch implements ftrace plugin for uprobes.
    > Right, like others have said, trace events is a much saner interface.
    > So the easiest way I can see that working is to register uprobes against
    > a file (not a pid). Then on creation it uses rmap to find all current
    > maps of that file and install the probe if there is a consumer for that
    > map.
    > Then for each new mmap() of that file, we also need to check if there's
    > a consumer ready and install the probe.

    That looks racy.

    Say you first create a probe on /bin/ls:

    perf probe p addr_in_ls /bin/ls

    then something else launches /bin/ls behind you, probe
    is set on it

    then you launch:

    perf record -e "probe:...." /bin/ls

    Then it goes recording the previous instance.

     \ /
      Last update: 2010-01-14 12:37    [W:0.020 / U:38.948 seconds]
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