Public bug reported:
This upstream fix from v6.18 is not present in the linux-nvidia-6.17
HWE. Pick the patch to that branch to avoid seeing cpu-count of 0 when
running perf stat.
Without fix:
$ sudo perf stat -a -- sleep 10s
Performance counter stats for 'system wide':
0 cpu-clock # 0.000 CPUs
utilized
906148 context-switches
377 cpu-migrations
With fix:
$ sudo ./perf stat -a -- sleep 10s
Performance counter stats for 'system wide':
3,525,111,825,753 cpu-clock # 352.063 CPUs
utilized
505,481 context-switches # 143.394 /sec
370 cpu-migrations # 0.105 /sec
** Affects: linux-nvidia (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2139648
Title:
Backport perf: Fix 0 count issue of cpu-clock
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