Hi Mathieu:
I am bob. And thanks for your time as always!
In the past for a while, I worked based on our kernel and applied the patches about coresight from “perf-opencsd-4.7”. However, it is not successful.
So, I work based on your kernel “perf-opencsd-4.7”, and add some drivers about the board made from Hisilicon. In theory, it should go well. But I get the
same error. When I use perf to record data, the record will stop for a long time. And I check the source code and the program will stay in “perf_evlist__poll”
and do not return just as follow. [cid:image008.jpg@01D20A2E.C3BE2EC0] So I use “Ctrl + C” to stop record, and I get the bug as follow.
[cid:image001.png@01D20A24.E814E6B0] [cid:image002.png@01D20A26.DF7334B0]
On the other hand, I do a test as follow. [cid:image009.jpg@01D20A2E.C3BE2EC0]
In the source code, when we use the ETR mode, it will allocate 1M space as follow. [cid:image010.jpg@01D20A2E.C3BE2EC0]
So, the coresight turns out to work well. Here, I have another question, when I change “SZ_1M” to a value bigger than 1M such as “SZ_2M”, and I try to enable
the etr device, I get the error “cannot allocate memory”.
And I am sorry to trouble you, can you give me some suggestion? It really take a lot of my time to work on the project, I hope I can success finally.
Thanks very much for your time and all your help!!
Best regards!
Bob
