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    SubjectRe: [RFC] [PATCH 0/7] UBP, XOL and Uprobes [ Summary of Comments and actions to be taken ]
    On Fri, Jan 22, 2010 at 12:32:32PM +0530, Srikar Dronamraju wrote:
    > Here is a summary of the Comments and actions that need to be taken for
    > the current uprobes patchset. Please let me know if I missed or
    > misunderstood any of your comments.
    > 1. Uprobes depends on trap signal.
    > Uprobes depends on trap signal rather than hooking to the global
    > die notifier. It was suggested that we hook to the global die notifier.
    > In the next version of patches, Uprobes will use the global die
    > notifier and look at the per-task count of the probes in use to
    > see if it has to be consumed.
    > However this would reduce the ability of uprobe handlers to
    > sleep. Since we are dealing with userspace, sleeping in handlers
    > would have been a good feature. We are looking at ways to get
    > around this limitation.

    We could set a TIF_ flag in the notifier to indicate a breakpoint hit
    and process it in task context before the task heads into userspace.


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