我有一个测试用例来观察性能iTLB-loads，iTLB-load-misses
perf stat -e dTLB-loads,dTLB-load-misses,iTLB-loads,iTLB-load-misses -p 22479
并获取输出：
进程 ID "22479"的性能计数器统计信息：
1,262,817 dTLB-loads
13,950 dTLB-load-misses # 1.10% of all dTLB cache hits
75 iTLB-loads
6,882 iTLB-load-misses # 9176.00% of all iTLB cache hits
3.999720948 seconds time elapsed
我不知道如何解释 iTLB 负载只有 75 但 iTLB 负载错过了 6,882 ？！
LSCPU 展示 ： 英特尔® 至强(R) CPU E5-2620 v4 @ 2.10GHz
编辑：
我可以将其解释为以下内容：
(75+6882)次的iTLB加载，有75次命中但6882次未命中？
编辑：
ocperf.py list | wc -l
Downloading https://download.01.org/perfmon/mapfile.csv to mapfile.csv
Traceback (most recent call last):
File "/home/marschen/tools/pmu-tools-master/ocperf.py", line 1012, in <module>
emap = find_emap()
File "/home/marschen/tools/pmu-tools-master/ocperf.py", line 831, in find_emap
event_download.download(el, toget)
File "/home/marschen/tools/pmu-tools-master/event_download.py", line 105, in download
getfile(modelpath, dir, "mapfile.csv")
File "/home/marschen/tools/pmu-tools-master/event_download.py", line 86, in getfile
f = urlopen(url)
File "/usr/lib64/python2.7/urllib2.py", line 154, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib64/python2.7/urllib2.py", line 431, in open
response = self._open(req, data)
File "/usr/lib64/python2.7/urllib2.py", line 449, in _open
'_open', req)
File "/usr/lib64/python2.7/urllib2.py", line 409, in _call_chain
result = func(*args)
File "/usr/lib64/python2.7/urllib2.py", line 1258, in https_open
context=self._context, check_hostname=self._check_hostname)
File "/usr/lib64/python2.7/urllib2.py", line 1211, in do_open
h.request(req.get_method(), req.get_selector(), req.data, headers)
File "/usr/lib64/python2.7/httplib.py", line 1017, in request
self._send_request(method, url, body, headers)
File "/usr/lib64/python2.7/httplib.py", line 1051, in _send_request
self.endheaders(body)
File "/usr/lib64/python2.7/httplib.py", line 1013, in endheaders
self._send_output(message_body)
File "/usr/lib64/python2.7/httplib.py", line 864, in _send_output
self.send(msg)
File "/usr/lib64/python2.7/httplib.py", line 826, in send
self.connect()
File "/usr/lib64/python2.7/httplib.py", line 1227, in connect
HTTPConnection.connect(self)
File "/usr/lib64/python2.7/httplib.py", line 807, in connect
self.timeout, self.source_address)
File "/usr/lib64/python2.7/socket.py", line 562, in create_connection
sock.connect(sa)
File "/usr/lib64/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
在 Broadwell 处理器上，perf 将
iTLB-loads映射到ITLB_MISSES.STLB_HIT，这表示 TLB 查找的事件，该查找错过了 L1 ITLB，但所有页面大小都命中了统一的 TLB，iTLB-load-misses到ITLB_MISSES.MISS_CAUSES_A_WALK，这表示 TLB 查找的事件，该事件错过了所有页面大小的 L1 ITLB 和统一 TLB(导致页面遍历)。因此，iTLB-load-misses可以大于或小于或等于iTLB-loads。它们是独立的事件。