Newer
Older
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
#!/usr/bin/python
##########################################################################
# Copyright (c) 2015, Salesforce.com, Inc.
# All rights reserved.
#
# Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#
# Neither the name of Salesforce.com nor the names of its
# contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
# NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##########################################################################
"""
**buddyinfo.py**
Linux uses buddy allocator for memory management. Pages
are allocated in each NUMA node and zones within each
node. Within each zones, pages are allocated as
contiguous groups of 1, 2, 3, 4, and so on order
pages where 1 means 4K pages. Number of free pages in
each bucket is exposed through /proc/buddyinfo
When this number goes below a threshold in any bucket,
kswapd (slowpath for finding free pages) kicks in. It
then scans for free pages in all order levels until
all of them reach above min limit. This process can take
long time and may cause issues for GC latencies.
Typical contents of /proc/buddyinfo:
- Node 0, zone Normal 1490 4026 12224 8508 4493 1929 849 301 101 45 5257
- Node 1, zone DMA 1 1 1 1 1 0 1 0 1 1 3
- Node 1, zone DMA32 15 3 2 5 8 7 4 4 7 8 681
- Node 1, zone Normal 6061 13681 20887 15188 9097 4546 1948 731 273 125 3976
Here are the fields interpretation in each row:
1. NUMA node (such as 0 or 1)
2. Zone name (Normal, DMA32, DMA, etc.)
3. Col. 3 to end: page order or buckets on contiguous memory sizes: 4K, 8K, 16K, 32K, 64K, 128K, 256K, 512K, 1024K, and 2048K
"""
import collectd
import platform
import os
import socket
import time
import re
os_name = platform.system()
BUDDY_FNAME = '/proc/buddyinfo'
METRIC_PLUGIN = 'buddyinfo'
METRIC_TYPE = 'gauge'
buddy_fields = ['numa_node',
'zone_name',
'bucket_free_pages'
]
buddy_metrics = ['bucket_free_pages_per_sec',
'total_free_pages_per_sec',
'pct_fragment_per_sec'
]
white_list = []
node_list = []
zone_list = []
stats_cache = {}
stats_current = {}
re_buddyinfo=re.compile(r'^\s*Node\s+(?P<node>\d+)'
r',\s+zone\s+(?P<zone>\S+)\s+(?P<pages>.*)$')
def init_stats_cache():
global white_list
if os.path.exists(BUDDY_FNAME):
num_buckets = 0
with open(BUDDY_FNAME) as f:
for line in f:
match = re_buddyinfo.search(line)
if not match:
collectd.error('buddyinfo: unknown line pattern: %s' % (line))
continue;
node = match.group('node')
zone = match.group('zone')
free_pages = match.group('pages').strip().split()
num_buckets = len(free_pages)
if node not in node_list:
node_list.append(node)
if zone not in zone_list:
zone_list.append(zone)
stats_cache[(node, zone, 'val')] = free_pages
stats_cache[(node, zone, 'ts')] = time.time()
f.close()
for i in range(0, num_buckets):
white_list.append('free_pages_' + str(4*2**i) + 'K')
collectd.info('buddyinfo: node_list : %s' % (node_list))
collectd.info('buddyinfo: zone_list : %s' % (zone_list))
collectd.info('buddyinfo: white_list: %s' % (white_list))
else:
collectd.info('buddyinfo: init_stats_cache: path: %s does not exist'
% (BUDDY_FNAME))
def collect_buddyinfo():
if os.path.exists(BUDDY_FNAME):
with open(BUDDY_FNAME) as f:
for line in f:
match = re_buddyinfo.search(line)
if not match:
continue;
node = match.group('node')
zone = match.group('zone')
free_pages = match.group('pages').strip().split()
stats_current[(node, zone, 'val')] = free_pages
stats_current[(node, zone, 'ts')] = time.time()
key_val = dict(zip(white_list, free_pages))
metric = collectd.Values()
metric.plugin = METRIC_PLUGIN
metric.plugin_instance = node
metric.type = METRIC_TYPE
for k in range(0, len(white_list)):
metric.type_instance = 'node_'+ node + '_zone_' + zone + '.'
metric.type_instance += white_list[k]
metric.values = [free_pages[k]]
metric.dispatch()
f.close()
else:
collectd.error('buddyinfo: procfs path: %s does not exist'
% (BUDDY_FNAME))
def swap_current_cache():
stats_cache = stats_current.copy()
def configer(ObjConfiguration):
collectd.info('buddyinfo plugin: configuring host' )
def initer():
collectd.info('buddyinfo initer: white list: %s' % (white_list))
init_stats_cache()
collectd.info('buddyinfo init: stats_cache: %s' % (stats_cache))
def reader(input_data=None):
collect_buddyinfo()
swap_current_cache()
def writer(metric, data=None):
for i in metric.values:
collectd.debug('%s (%s): %f' % (metric.plugin, metric.type, i))
def shutdown():
collectd.info('buddyinfo plugin shutting down')
#== Callbacks ==#
if (os_name == 'Linux'):
collectd.register_config(configer)
collectd.register_init(initer)
collectd.register_read(reader)
collectd.register_write(writer)
collectd.register_shutdown(shutdown)
else:
collectd.warning('buddyinfo plugin currently works for Linux only')