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    SubjectRe: [PATCH 1/3] perf: add context field to perf_event
    On Tue, 2011-07-12 at 12:16 +0300, Avi Kivity wrote:
    > On 07/12/2011 12:14 PM, Peter Zijlstra wrote:
    > > 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.
    > The guarantee is that the task was sleeping just before the function is
    > called. Of course it's woken up to run the function.
    > The idea is that you run the function in a known safe point to avoid
    > extra synchronization.

    I'd much rather we didn't wake the task and let it sleep, that's usually
    a very safe place for tasks to be. All you'd need is a guarantee it
    won't be woken up while you're doing your thing.

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