Почему Perf Stat -e ЦП/ Мем -нагрузки/ ничего не выводит? ⇐ Linux

[Anonymous]

Показывает, что CPU/Memoads/ поддерживается.
$ perf list | grep mem
mem-loads OR cpu/mem-loads/ [Kernel PMU event]
< /code>
Однако, когда я на самом деле это делаю, он вообще не показывает ввода. < /p>
$ sudo perf stat -e cpu/mem-loads/
^C
Performance counter stats for 'system wide':

0 cpu/mem-loads/

4.941360715 seconds time elapsed

Тем не менее, другие события, такие как кеш-промежутки , работают нормально.
$ sudo perf stat -e cache-misses
^C
Performance counter stats for 'system wide':

240,851,238 cache-misses

3.137084578 seconds time elapsed
< /code>
Я хочу знать, почему. < /p>
==== edit ==== < /p>
$ lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 46 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 72
On-line CPU(s) list: 0-71
Vendor ID: GenuineIntel
Model name: Intel(R) Xeon(R) Gold 6240 CPU @ 2.60GHz
CPU family: 6
Model: 85
Thread(s) per core: 2
Core(s) per socket: 18
Socket(s): 2
Stepping: 7
CPU(s) scaling MHz: 96%
CPU max MHz: 3900.0000
CPU min MHz: 1000.0000
BogoMIPS: 5200.00
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe sysc
all nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pcl
mulqdq dtes64 ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_t
imer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 intel_ppin ssbd mba ibrs ibpb stibp i
brs_enhanced tpr_shadow flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm mpx rdt_a avx5
12f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_
occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts vnmi pku ospke avx512_vnni md_clear flush_l1d arch_capabilitie
s
Virtualization features:
Virtualization: VT-x
Caches (sum of all):
L1d: 1.1 MiB (36 instances)
L1i: 1.1 MiB (36 instances)
L2: 36 MiB (36 instances)
L3: 49.5 MiB (2 instances)
NUMA:
NUMA node(s): 2
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59,61,63,65,67,69,71
Vulnerabilities:
Gather data sampling: Mitigation; Microcode
Itlb multihit: KVM: Mitigation: VMX disabled
L1tf: Not affected
Mds: Not affected
Meltdown: Not affected
Mmio stale data: Mitigation; Clear CPU buffers; SMT vulnerable
Retbleed: Mitigation; Enhanced IBRS
Spec rstack overflow: Not affected
Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl
Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Spectre v2: Mitigation; Enhanced / Automatic IBRS, IBPB conditional, RSB filling, PBRSB-eIBRS SW sequence
Srbds: Not affected
Tsx async abort: Mitigation; TSX disabled
< /code>
uname -a
Linux 10-2-12-81 5.14.0-427.26.1.el9_4.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Jul 23 16:00:21 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux


Подробнее здесь: https://stackoverflow.com/questions/796 ... ts-nothing