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    Subject[RFC] [PATCH 0/7] UBP, XOL and Uprobes

    This patchset implements Uprobes which enables you to dynamically
    break into any routine in a user space application and collect
    information non-disruptively. Uprobes is based on utrace and uses
    x86 instruction decoder.

    When a uprobe is registered, Uprobes makes a copy of the probed
    instruction, stops the probed application, replaces the first
    byte(s) of the probed instruction with a breakpoint instruction and
    allows the probed application to continue. (Uprobes uses the same
    copy-on-write mechanism so that the breakpoint affects only that

    When a CPU hits the breakpoint instruction, Uprobes intercepts the
    SIGTRAP and finds the associated uprobe. It then executes the
    associated handler. Uprobes single-steps its copy of the probed
    instruction and resumes execution of the probed process at the
    instruction following the probepoint. Instruction copies to be
    single-stepped are stored in a per-process "single-step out of line
    (XOL) area,"

    Uprobes can be used to take advantage of static markers available
    in user space applications.

    Advantages of uprobes over conventional debugging include:
    1. Non-disruptive.
    2. Uses Execution out of line(XOL),
    3. Much better handling of multithreaded programs because of XOL.
    4. No context switch between tracer, tracee.

    Here is the list of TODO Items.

    - Provide a perf interface to uprobes.
    - Return probes.
    - Support for Other Architectures.
    - Jump optimization.

    This patchset provides
    Subject: [RFC] [PATCH 0/7] UBP, XOL and Uprobes
    Subject: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)
    Subject: [RFC] [PATCH 2/7] x86 support for UBP
    Subject: [RFC] [PATCH 3/7] Execution out of line (XOL)
    Subject: [RFC] [PATCH 4/7] Uprobes Implementation
    Subject: [RFC] [PATCH 5/7] X86 Support for Uprobes
    Subject: [RFC] [PATCH 6/7] Uprobes Documentation
    Subject: [RFC] [PATCH 7/7] Ftrace plugin for Uprobes

    This patchset is based on

    If and when utrace gets accepted into tip tree or Mainline, I will rebase
    this patchset.

    Please do provide your valuable comments.

    Thanks and Regards

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