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xen-devel
Re: [Xen-devel] xentrace buffering
pak333@xxxxxxxxxxx wrote:
Hi,
I am looking at the xentrace code and it looks like the individual
cores/cpus write their (trace data) into individual regions of
memory and they are all collected by xentrace and processed.
I would like to have one trace buffer for all cores so that I *can get
an exact sequence in time order* of the events that have occurred over
the sampling period across cores/cpus.
Is that easily doable>? If so, any pointers can someone send me
pointers as to where I should start looking at modifying.
It's doable, but would require some work. I think the reason for having
different buffers for each core is so that the trace code can be really
light weight, since it doesn't have to deal with acquiring a write lock,
etc.
Theoretically, each core's clock should be very close to all the others,
so the timestamp in the trace records should allow a reasonably accurate
reconstruction of the order of events.
Rob
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