Messages in this thread | | | From | Alexander Shishkin <> | Subject | Re: [PATCH v4 09/22] perf: Support overwrite mode for AUX area | Date | Tue, 09 Sep 2014 16:00:43 +0300 |
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Peter Zijlstra <peterz@infradead.org> writes:
> On Tue, Sep 09, 2014 at 02:53:42PM +0300, Alexander Shishkin wrote: > >> We can infer where the new data starts from the timestamps in the trace >> stream, so the decoder can take care of it (and that's how it's done at >> the moment). > > So that means the data stream can be read from arbitrary locations, > right? I can imagine not all data streams are always readable like that > (for instance the perf datastream is not). > > Does it make sense to have the driver provide head,tail for this mode? > In your case you can simply provide whatever, but for those where it > matters they can ensure consistent data such that the stream might be > recoverable.
Yes, there's no reason not to, and some HW might indeed benefit from this.
Regards, -- Alex
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