Re: [PATCHv8 2/5] arm64: dts: qcom: msm8998: Add Coresight support

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation



[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [Linux for Sparc]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux