Hi,
On 7/18/2019 3:07 PM, Suzuki K Poulose wrote:
Using the sysfs doesn't guarantee that the ETR actually uses SG mode,
unless
the buffer size selected is > 1M, which is why I am more interested in the
perf usage. Alternatively you may configure a larger buffer size (say,
8MB) via:
echo 0x800000 > /sys/bus/coresight/.../tmc_etr0/buffer_size
Yes, you had mentioned about setting buffer size > 1M in the same
thread[1] and I had followed the same.
[1] https://lkml.org/lkml/2019/1/18/311
As said in one of the series initially [1], QCOM msm downstream kernels
have been using scatter gather mode and we haven't seen any fatal issues.
[1] https://patchwork.kernel.org/patch/10769535/
I haven't seen any test results there either.
You did not ask for it there ;)
I do not have the test results handy now and those platforms.
I will arrange for them and post some test results.
Just to confirm, do you need some traces or just the buffer size
and sink set?
Thanks,
Sai
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