我使用的Ubuntu版本是Ubuntu 18.04.6 LTS，内核版本是5.4.0-148 通用。我的处理器是第 12 代英特尔 (R) 酷睿 (TM) i7-12700。
我想知道我的CPU中不同页面大小（1G、2MB、4KB）的TLB条目数量，以及程序执行期间dTLB未命中的数量。
cpuid -1命令告诉我它们是0：
L1 TLB/cache information: 2M/4M pages & L1 TLB (0x80000005/eax):
instruction # entries = 0x0 (0)
instruction associativity = 0x0 (0)
data # entries = 0x0 (0)
data associativity = 0x0 (0)
L1 TLB/cache information: 4K pages & L1 TLB (0x80000005/ebx):
instruction # entries = 0x0 (0)
instruction associativity = 0x0 (0)
data # entries = 0x0 (0)
data associativity = 0x0 (0)
L1 data cache information (0x80000005/ecx):
line size (bytes) = 0x0 (0)
lines per tag = 0x0 (0)
associativity = 0x0 (0)
size (KB) = 0x0 (0)
L1 instruction cache information (0x80000005/edx):
line size (bytes) = 0x0 (0)
lines per tag = 0x0 (0)
associativity = 0x0 (0)
size (KB) = 0x0 (0)
L2 TLB/cache information: 2M/4M pages & L2 TLB (0x80000006/eax):
instruction # entries = 0x0 (0)
instruction associativity = L2 off (0)
data # entries = 0x0 (0)
data associativity = L2 off (0)
L2 TLB/cache information: 4K pages & L2 TLB (0x80000006/ebx):
instruction # entries = 0x0 (0)
instruction associativity = L2 off (0)
data # entries = 0x0 (0)
data associativity = L2 off (0)
L2 unified cache information (0x80000006/ecx):
line size (bytes) = 0x40 (64)
lines per tag = 0x0 (0)
associativity = 0x7 (7)
size (KB) = 0x500 (1280)
L3 cache information (0x80000006/edx):
line size (bytes) = 0x0 (0)
lines per tag = 0x0 (0)
associativity = L2 off (0)
size (in 512KB units) = 0x0 (0)
perf stat -e dTLB-loads,dTLB-load-misses,iTLB-load-misses显示不支持
更新：
$ cpuid -1 -l 2
CPU:
0xff: cache data is in CPUID 4
0xfe: unknown
0xf0: 64 byte prefetching
$ cpuid -1 -l 0x18
CPU:
0x00000018 0x00: eax=0x00000004 ebx=0x00000000 ecx=0x00000000 edx=0x00000000
$ perf -v
perf version 5.4.231
$ perf list
List of pre-defined events (to be used in -e):
branch-instructions OR branches [Hardware event]
branch-misses [Hardware event]
bus-cycles [Hardware event]
cache-misses [Hardware event]
cache-references [Hardware event]
cpu-cycles OR cycles [Hardware event]
instructions [Hardware event]
ref-cycles [Hardware event]
alignment-faults [Software event]
bpf-output [Software event]
context-switches OR cs [Software event]
cpu-clock [Software event]
cpu-migrations OR migrations [Software event]
dummy [Software event]
emulation-faults [Software event]
major-faults [Software event]
minor-faults [Software event]
page-faults OR faults [Software event]
task-clock [Software event]
我完全不知道我的机器出了什么问题。
答案1
我怀疑你的机器有问题。cpuid的输出是原始的，需要一些解释；具体来说，对于 TLB 信息，你应该看看叶子2的信息而不是您引用的部分。您会在输出中找到它，或者您可以直接询问：
$ cpuid -1 -l 2
CPU:
0x63: data TLB: 2M/4M pages, 4-way, 32 entries
data TLB: 1G pages, 4-way, 4 entries
0x03: data TLB: 4K pages, 4-way, 64 entries
0x76: instruction TLB: 2M/4M pages, fully, 8 entries
0xff: cache data is in CPUID leaf 4
0xb5: instruction TLB: 4K, 8-way, 64 entries
0xf0: 64 byte prefetching
0xc1: L2 TLB: 4K/2M pages, 8-way, 1024 entries
就目前而言perf，你的版本可能不知道你的CPU（我没有检查过）。