ACPI support for the ARMv8.2 Statistical Profiling Extension
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Fix Committed
|
Undecided
|
dann frazier | ||
Disco |
Fix Released
|
Undecided
|
dann frazier |
Bug Description
[Impact]
perf support for the ARMv8.2 Statistical Profiling Extension does not work on ACPI platforms.
[Test Case]
ubuntu@d06-2:~$ sudo perf record -e arm_spe/
10000+0 records in
10000+0 records out
5120000 bytes (5.1 MB, 4.9 MiB) copied, 0.0201586 s, 254 MB/s
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.354 MB perf.data ]
ubuntu@d06-2:~$ sudo perf report --dump-raw-trace
[...]
0 0 0x4a90 [0x30]: PERF_RECORD_
.
. ... ARM SPE data: size 1400784 bytes
. 00000000: b0 28 31 25 10 00 00 ff c0 PC 0xff00001025312
. 00000009: 99 07 00 LAT 7 ISSUE
. 0000000c: 98 09 00 LAT 9 TOT
. 0000000f: 52 16 00 EV RETIRED L1D-ACC
[...]
[Fix]
d482e575fbf0f perf: arm_spe: Enable ACPI/Platform automatic module loading
d24a0c7099b32 arm_pmu: acpi: spe: Add initial MADT/SPE probing
56855a99f3d0d ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens
ed2b664fcc807 ACPI/PPTT: Modify node flag detection to find last IDENTICAL
[Regression Risk]
The functional changes are all ARM specific (while ACPI PPTT is generic, it is only enabled under arch/arm64 currently). There are new macros and an updated structure in generic code, but all pretty innocuous.
Changed in linux (Ubuntu Disco): | |
status: | New → In Progress |
assignee: | nobody → dann frazier (dannf) |
description: | updated |
Changed in linux (Ubuntu): | |
status: | In Progress → Fix Committed |
Changed in linux (Ubuntu Disco): | |
status: | In Progress → Fix Committed |
This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification- needed- disco' to 'verification- done-disco' . If the problem still exists, change the tag 'verification- needed- disco' to 'verification- failed- disco'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.
See https:/ /wiki.ubuntu. com/Testing/ EnableProposed for documentation how to enable and use -proposed. Thank you!