mirror of
https://github.com/prometheus/node_exporter.git
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collector: add slab info
Co-authored-by: Ben Kochie <superq@gmail.com> Signed-off-by: Nobuhiro MIKI <nmiki@yahoo-corp.jp>
This commit is contained in:
Nobuhiro MIKI
Johannes 'fish' Ziemke
parent
69a3f73a9b
commit
3ed95908d6
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@ -8,6 +8,7 @@
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* [ENHANCEMENT] Add node_softirqs_total metric #2221
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* [ENHANCEMENT] Add device filter flags to arp collector #2254
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* [ENHANCEMENT] Add rapl zone name label option #2401
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* [ENHANCEMENT] Add slabinfo collector #1799
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* [BUGFIX] Sanitize rapl zone names #2299
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## 1.3.1 / 2021-12-01
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@ -210,6 +210,7 @@ perf | Exposes perf based metrics (Warning: Metrics are dependent on kernel conf
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processes | Exposes aggregate process statistics from `/proc`. | Linux
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qdisc | Exposes [queuing discipline](https://en.wikipedia.org/wiki/Network_scheduler#Linux_kernel) statistics | Linux
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runit | Exposes service status from [runit](http://smarden.org/runit/). | _any_
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slabinfo | Exposes slab statistics from `/proc/slabinfo`. Note that permission of `/proc/slabinfo` is usually 0400, so set it appropriately. | Linux
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supervisord | Exposes service status from [supervisord](http://supervisord.org/). | _any_
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systemd | Exposes service and system status from [systemd](http://www.freedesktop.org/wiki/Software/systemd/). | Linux
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tcpstat | Exposes TCP connection status information from `/proc/net/tcp` and `/proc/net/tcp6`. (Warning: the current version has potential performance issues in high load situations.) | Linux
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@ -3013,6 +3013,7 @@ node_scrape_collector_success{collector="qdisc"} 1
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node_scrape_collector_success{collector="rapl"} 1
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node_scrape_collector_success{collector="schedstat"} 1
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node_scrape_collector_success{collector="selinux"} 1
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node_scrape_collector_success{collector="slabinfo"} 1
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node_scrape_collector_success{collector="sockstat"} 1
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node_scrape_collector_success{collector="softnet"} 1
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node_scrape_collector_success{collector="stat"} 1
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@ -3029,6 +3030,36 @@ node_scrape_collector_success{collector="zoneinfo"} 1
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# HELP node_selinux_enabled SELinux is enabled, 1 is true, 0 is false
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# TYPE node_selinux_enabled gauge
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node_selinux_enabled 0
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# HELP node_slabinfo_active_objects The number of objects that are currently active (i.e., in use).
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# TYPE node_slabinfo_active_objects gauge
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node_slabinfo_active_objects{slab="dmaengine-unmap-128"} 1206
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node_slabinfo_active_objects{slab="kmalloc-8192"} 132
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node_slabinfo_active_objects{slab="kmem_cache"} 320
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node_slabinfo_active_objects{slab="tw_sock_TCP"} 704
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# HELP node_slabinfo_object_size_bytes The size of objects in this slab, in bytes.
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# TYPE node_slabinfo_object_size_bytes gauge
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node_slabinfo_object_size_bytes{slab="dmaengine-unmap-128"} 1088
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node_slabinfo_object_size_bytes{slab="kmalloc-8192"} 8192
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node_slabinfo_object_size_bytes{slab="kmem_cache"} 256
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node_slabinfo_object_size_bytes{slab="tw_sock_TCP"} 256
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# HELP node_slabinfo_objects The total number of allocated objects (i.e., objects that are both in use and not in use).
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# TYPE node_slabinfo_objects gauge
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node_slabinfo_objects{slab="dmaengine-unmap-128"} 1320
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node_slabinfo_objects{slab="kmalloc-8192"} 148
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node_slabinfo_objects{slab="kmem_cache"} 320
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node_slabinfo_objects{slab="tw_sock_TCP"} 864
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# HELP node_slabinfo_objects_per_slab The number of objects stored in each slab.
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# TYPE node_slabinfo_objects_per_slab gauge
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node_slabinfo_objects_per_slab{slab="dmaengine-unmap-128"} 30
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node_slabinfo_objects_per_slab{slab="kmalloc-8192"} 4
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node_slabinfo_objects_per_slab{slab="kmem_cache"} 32
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node_slabinfo_objects_per_slab{slab="tw_sock_TCP"} 32
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# HELP node_slabinfo_pages_per_slab The number of pages allocated for each slab.
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# TYPE node_slabinfo_pages_per_slab gauge
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node_slabinfo_pages_per_slab{slab="dmaengine-unmap-128"} 8
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node_slabinfo_pages_per_slab{slab="kmalloc-8192"} 8
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node_slabinfo_pages_per_slab{slab="kmem_cache"} 2
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node_slabinfo_pages_per_slab{slab="tw_sock_TCP"} 2
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# HELP node_sockstat_FRAG6_inuse Number of FRAG6 sockets in state inuse.
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# TYPE node_sockstat_FRAG6_inuse gauge
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node_sockstat_FRAG6_inuse 0
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@ -3035,6 +3035,7 @@ node_scrape_collector_success{collector="qdisc"} 1
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node_scrape_collector_success{collector="rapl"} 1
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node_scrape_collector_success{collector="schedstat"} 1
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node_scrape_collector_success{collector="selinux"} 1
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node_scrape_collector_success{collector="slabinfo"} 1
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node_scrape_collector_success{collector="sockstat"} 1
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node_scrape_collector_success{collector="softnet"} 1
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node_scrape_collector_success{collector="stat"} 1
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@ -3051,6 +3052,36 @@ node_scrape_collector_success{collector="zoneinfo"} 1
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# HELP node_selinux_enabled SELinux is enabled, 1 is true, 0 is false
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# TYPE node_selinux_enabled gauge
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node_selinux_enabled 0
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# HELP node_slabinfo_active_objects The number of objects that are currently active (i.e., in use).
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# TYPE node_slabinfo_active_objects gauge
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node_slabinfo_active_objects{slab="dmaengine-unmap-128"} 1206
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node_slabinfo_active_objects{slab="kmalloc-8192"} 132
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node_slabinfo_active_objects{slab="kmem_cache"} 320
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node_slabinfo_active_objects{slab="tw_sock_TCP"} 704
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# HELP node_slabinfo_object_size_bytes The size of objects in this slab, in bytes.
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# TYPE node_slabinfo_object_size_bytes gauge
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node_slabinfo_object_size_bytes{slab="dmaengine-unmap-128"} 1088
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node_slabinfo_object_size_bytes{slab="kmalloc-8192"} 8192
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node_slabinfo_object_size_bytes{slab="kmem_cache"} 256
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node_slabinfo_object_size_bytes{slab="tw_sock_TCP"} 256
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# HELP node_slabinfo_objects The total number of allocated objects (i.e., objects that are both in use and not in use).
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# TYPE node_slabinfo_objects gauge
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node_slabinfo_objects{slab="dmaengine-unmap-128"} 1320
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node_slabinfo_objects{slab="kmalloc-8192"} 148
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node_slabinfo_objects{slab="kmem_cache"} 320
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node_slabinfo_objects{slab="tw_sock_TCP"} 864
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# HELP node_slabinfo_objects_per_slab The number of objects stored in each slab.
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# TYPE node_slabinfo_objects_per_slab gauge
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node_slabinfo_objects_per_slab{slab="dmaengine-unmap-128"} 30
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node_slabinfo_objects_per_slab{slab="kmalloc-8192"} 4
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node_slabinfo_objects_per_slab{slab="kmem_cache"} 32
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node_slabinfo_objects_per_slab{slab="tw_sock_TCP"} 32
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# HELP node_slabinfo_pages_per_slab The number of pages allocated for each slab.
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# TYPE node_slabinfo_pages_per_slab gauge
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node_slabinfo_pages_per_slab{slab="dmaengine-unmap-128"} 8
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node_slabinfo_pages_per_slab{slab="kmalloc-8192"} 8
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node_slabinfo_pages_per_slab{slab="kmem_cache"} 2
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node_slabinfo_pages_per_slab{slab="tw_sock_TCP"} 2
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# HELP node_sockstat_FRAG6_inuse Number of FRAG6 sockets in state inuse.
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# TYPE node_sockstat_FRAG6_inuse gauge
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node_sockstat_FRAG6_inuse 0
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6
collector/fixtures/proc/slabinfo
Normal file
6
collector/fixtures/proc/slabinfo
Normal file
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@ -0,0 +1,6 @@
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slabinfo - version: 2.1
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# name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>
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tw_sock_TCP 704 864 256 32 2 : tunables 0 0 0 : slabdata 27 27 0
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dmaengine-unmap-128 1206 1320 1088 30 8 : tunables 0 0 0 : slabdata 44 44 0
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kmalloc-8192 132 148 8192 4 8 : tunables 0 0 0 : slabdata 37 37 0
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kmem_cache 320 320 256 32 2 : tunables 0 0 0 : slabdata 10 10 0
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121
collector/slabinfo_linux.go
Normal file
121
collector/slabinfo_linux.go
Normal file
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@ -0,0 +1,121 @@
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// Copyright 2022 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build linux && !noslabinfo
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// +build linux,!noslabinfo
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package collector
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import (
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"fmt"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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)
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type slabinfoCollector struct {
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fs procfs.FS
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logger log.Logger
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subsystem string
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labels []string
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}
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func init() {
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registerCollector("slabinfo", defaultDisabled, NewSlabinfoCollector)
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}
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func NewSlabinfoCollector(logger log.Logger) (Collector, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open procfs: %w", err)
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}
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return &slabinfoCollector{logger: logger,
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fs: fs,
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subsystem: "slabinfo",
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labels: []string{"slab"},
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}, nil
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}
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func (c *slabinfoCollector) Update(ch chan<- prometheus.Metric) error {
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slabinfo, err := c.fs.SlabInfo()
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if err != nil {
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return fmt.Errorf("couldn't get %s: %w", c.subsystem, err)
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}
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for _, slab := range slabinfo.Slabs {
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ch <- c.activeObjects(slab.Name, slab.ObjActive)
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ch <- c.objects(slab.Name, slab.ObjNum)
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ch <- c.objectSizeBytes(slab.Name, slab.ObjSize)
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ch <- c.objectsPerSlab(slab.Name, slab.ObjPerSlab)
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ch <- c.pagesPerSlab(slab.Name, slab.PagesPerSlab)
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}
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return nil
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}
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func (c *slabinfoCollector) activeObjects(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "active_objects"),
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"The number of objects that are currently active (i.e., in use).",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) objects(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "objects"),
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"The total number of allocated objects (i.e., objects that are both in use and not in use).",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) objectSizeBytes(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "object_size_bytes"),
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"The size of objects in this slab, in bytes.",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) objectsPerSlab(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "objects_per_slab"),
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"The number of objects stored in each slab.",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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func (c *slabinfoCollector) pagesPerSlab(label string, val int64) prometheus.Metric {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, "pages_per_slab"),
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"The number of pages allocated for each slab.",
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c.labels, nil)
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return prometheus.MustNewConstMetric(
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desc, prometheus.GaugeValue, float64(val), label,
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)
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}
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@ -38,6 +38,7 @@ enabled_collectors=$(cat << COLLECTORS
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rapl
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schedstat
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selinux
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slabinfo
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sockstat
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stat
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thermal_zone
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