Public bug reported:
[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/ts_enable=1,pa_enable=1/ dd
if=/dev/zero of=/dev/null count=10000
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_AUXTRACE size: 0x155fd0 offset: 0 ref: 0x226974
.
. ... 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]
[Regression Risk]
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Status: New => In Progress
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1841490
Title:
ACPI support for the ARMv8.2 Statistical Profiling Extension
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