* Metzger, Markus T <[email protected]> wrote:
> The ptrace API would allow the user to:
> - define (and query) the overflow mechanism
> (wrap-around or event)
> - define (and query) the size of the buffer within certain limits
> (we could either give an error or cut off)
> - define (and query) events to be monitored
> (last branch trace, scheduling timestamps)
> - get a single BTS record
> - query the number of BTS records
> (to find out how big your drain buffer needs to be; it may be bigger
> than you requested)
> - drain all BTS records (copy, then clear)
> - clear all BTS records
>
> Draining would require the user to allocate a buffer to hold the data,
> which might not be feasible when he is near his memory limit. He could
> fall back to looping over the single-entry get. It is questionable,
> how useful the drain ptrace command would actually be; we might want
> to replace it with a get range command.
>
> Are you OK with this?
this sounds a lot more flexible to me. Please, once it looks good to all
of us also extend LTP's ptrace bits with unit tests for these API
additions. (Cc: such LTP bits to [email protected])
Ingo
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