** Changed in: linux (Ubuntu Zesty)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1689856
Title:
perf: qcom: Add L3 cache PMU driver
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Zesty:
Fix Committed
Bug description:
[Impact]
Without this driver, users of Qualcomm QDF2400 servers will be unable to
profile L3 cache events.
[Test case]
ubuntu@ubuntu:~$ sudo perf list | grep l3cache | wc -l
84
Without this driver, there are 0.
[Regression Risk]
This is a new driver that is only used on these servers, so the regression
risk is pretty isolated to this platform. To mitigate the risk there, I ran
perf_fuzzer on that system and verified that it survived. Note: I did this
testing w/ a workaround for LP: #1689855 applied, to avoid hangs caused by a
hardware issue.
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