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    SubjectRe: [PATCH 1/3] perf: add context field to perf_event
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    On Tue, 2011-07-12 at 12:08 +0300, Avi Kivity wrote:
    > Similar, but with stronger guarantees: when the function is called,
    > current == p, and the task was either sleeping or in userspace.

    If the task is sleeping, current can never be p.


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