Repository navigation
Expand file tree
/
Copy pathcachestat.py
More file actions
executable file
·203 lines (170 loc) · 4.81 KB
/
Copy pathcachestat.py
File metadata and controls
executable file
·203 lines (170 loc) · 4.81 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
#!/usr/bin/python
#
# cachestat Count cache kernel function calls.
# For Linux, uses BCC, eBPF. See .c file.
#
# USAGE: cachestat
# Taken from funccount by Brendan Gregg
# This is a rewrite of cachestat from perf to bcc
# https://github.com/brendangregg/perf-tools/blob/master/fs/cachestat
#
# Copyright (c) 2016 Allan McAleavy.
# Copyright (c) 2015 Brendan Gregg.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 09-Sep-2015 Brendan Gregg Created this.
# 06-Nov-2015 Allan McAleavy
# 13-Jan-2016 Allan McAleavy run pep8 against program
from __future__ import print_function
from bcc import BPF
from time import sleep, strftime
import signal
import re
from sys import argv
# signal handler
def signal_ignore(signal, frame):
print()
# Function to gather data from /proc/meminfo
# return dictionary for quicker lookup of both values
def get_meminfo():
result = dict()
for line in open('/proc/meminfo'):
k = line.split(':', 3)
v = k[1].split()
result[k[0]] = int(v[0])
return result
# set global variables
rtaccess = 0
wtaccess = 0
mpa = 0
mbd = 0
apcl = 0
apd = 0
access = 0
misses = 0
rhits = 0
whits = 0
debug = 0
# args
def usage():
print("USAGE: %s [-T] [ interval [count] ]" % argv[0])
exit()
# arguments
interval = 5
count = -1
tstamp = 0
if len(argv) > 1:
if str(argv[1]) == '-T':
tstamp = 1
if len(argv) > 1 and tstamp == 0:
try:
if int(argv[1]) > 0:
interval = int(argv[1])
if len(argv) > 2:
if int(argv[2]) > 0:
count = int(argv[2])
except:
usage()
elif len(argv) > 2 and tstamp == 1:
try:
if int(argv[2]) > 0:
interval = int(argv[2])
if len(argv) >= 4:
if int(argv[3]) > 0:
count = int(argv[3])
except:
usage()
# load BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
struct key_t {
u64 ip;
};
BPF_HASH(counts, struct key_t);
int do_count(struct pt_regs *ctx) {
struct key_t key = {};
u64 zero = 0, *val;
u64 ip;
key.ip = PT_REGS_IP(ctx);
val = counts.lookup_or_init(&key, &zero); // update counter
(*val)++;
return 0;
}
"""
b = BPF(text=bpf_text)
b.attach_kprobe(event="add_to_page_cache_lru", fn_name="do_count")
b.attach_kprobe(event="mark_page_accessed", fn_name="do_count")
b.attach_kprobe(event="account_page_dirtied", fn_name="do_count")
b.attach_kprobe(event="mark_buffer_dirty", fn_name="do_count")
# header
if tstamp:
81E5
print("%-8s " % "TIME", end="")
print("%8s %8s %8s %10s %10s %12s %10s" %
("HITS", "MISSES", "DIRTIES",
"READ_HIT%", "WRITE_HIT%", "BUFFERS_MB", "CACHED_MB"))
loop = 0
exiting = 0
while 1:
if count > 0:
loop += 1
if loop > count:
exit()
try:
sleep(interval)
except KeyboardInterrupt:
exiting = 1
# as cleanup can take many seconds, trap Ctrl-C:
signal.signal(signal.SIGINT, signal_ignore)
counts = b.get_table("counts")
for k, v in sorted(counts.items(), key=lambda counts: counts[1].value):
if re.match('mark_page_accessed', b.ksym(k.ip)) is not None:
mpa = max(0, v.value)
if re.match('mark_buffer_dirty', b.ksym(k.ip)) is not None:
mbd = max(0, v.value)
if re.match('add_to_page_cache_lru', b.ksym(k.ip)) is not None:
apcl = max(0, v.value)
if re.match('account_page_dirtied', b.ksym(k.ip)) is not None:
apd = max(0, v.value)
# access = total cache access incl. reads(mpa) and writes(mbd)
# misses = total of add to lru which we do when we write(mbd)
# and also the mark the page dirty(same as mbd)
access = (mpa + mbd)
misses = (apcl + apd)
# rtaccess is the read hit % during the sample period.
# wtaccess is the write hit % during the smaple period.
if mpa > 0:
rtaccess = float(mpa) / (access + misses)
if apcl > 0:
wtaccess = float(apcl) / (access + misses)
if wtaccess != 0:
whits = 100 * wtaccess
if rtaccess != 0:
rhits = 100 * rtaccess
if debug:
print("%d %d %d %d %d %d %f %f %d %d\n" %
(mpa, mbd, apcl, apd, access, misses,
rtaccess, wtaccess, rhits, whits))
counts.clear()
# Get memory info
mem = get_meminfo()
cached = int(mem["Cached"]) / 1024
buff = int(mem["Buffers"]) / 1024
if tstamp == 1:
print("%-8s " % strftime("%H:%M:%S"), end="")
print("%8d %8d %8d %9.1f%% %9.1f%% %12.0f %10.0f" %
(access, misses, mbd, rhits, whits, buff, cached))
mpa = 0
mbd = 0
apcl = 0
apd = 0
access = 0
misses = 0
rhits = 0
cached = 0
buff = 0
whits = 0
rtaccess = 0
wtaccess = 0
if exiting:
print("Detaching...")
exit()