Mathieu,
Thanks for that.
On 19/06/18 20:45, Mathieu Poirier wrote:
Good afternoon to all,
For the 4.18 cycle I pushed Suzuki's new ETR driver implementation to GitHub's perf-opencsd repository [1]. It includes support for SG and contiguous mode, all handled automatically without the need for user intervention. I gave it a couple of spin and things work as advertised.
So it's up there now - please try it out in your setup while I review the patches on the public mailing list.
Note that this has no correlation with the support for CPU-wide scenarios patchset I sent out last week.
For people interested in testing it out :
Please note that the scatter-gather mode is disabled by default, unless the DT has the following property in the TMC-ETR :
"arm,scatter-gather"
If you see packet losses, you could tune the buffer sizes to avoid it.
And as you may be aware, you could tune the aux trace buffer size by using :
perf record -m <mmap-size>,<aux-trace-size> ....
and also, you could tune the buffer size used by the ETR by setting :
/sys/.../devices/<tmc-etr-device>/buffer_size
Regards Suzuki