[PATCH v1 1/3] coresight: etm-perf: Correct buffer syncing for snapshot

[Leo Yan]

On Wed, Jun 09, 2021 at 09:35:55AM +0800, Leo Yan wrote:

[...]

> > The problem with this approach is that if the AUX buffer is 4MB and the CS
> > buffer is 1MB then we only record 1MB, but because of N:1 topologies we may not
> > be able to do better.  I haven't looked at the code yet, something I will do
> > tomorrow.
> 
> Yes, the fixing in this patch copies the trace data is limited by the
> CoreSight bounce buffer length.  So if CoreSight buffer length is
> 1MiB, then we have no chance to allocate 4MiB for AUX buffer.

Sorry for typo, just correct:

if CoreSight buffer length is 1MiB, then we have no chance to *copy*
4MiB trace data for AUX buffer.