Add BSD exec statistics collector (#457)
* First pass of a sysctl_bsd source, exec_bsd + exec metrics * Incorportate PR feedback, including removing pre-build descriptions, unit conversion callback. * Remove redundant cached_description field, per PR feedback * Incorporate PR feedbackpull/484/head
Derek Marcotte
8 years ago
committed by
Tobias Schmidt
parent
c6e66756b3
commit
5c28ab044d
@ -0,0 +1,98 @@
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// Copyright 2017 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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// +build freebsd dragonfly
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// +build !noexec
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package collector
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import (
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"github.com/prometheus/client_golang/prometheus"
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)
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type execCollector struct {
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sysctls []bsdSysctl
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}
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func init() {
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Factories["exec"] = NewExecCollector
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}
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// NewExecCollector returns a new Collector exposing system execution statistics
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func NewExecCollector() (Collector, error) {
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// From sys/vm/vm_meter.c:
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// All are of type CTLTYPE_UINT.
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//
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// vm.stats.sys.v_swtch: Context switches
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// vm.stats.sys.v_trap: Traps
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// vm.stats.sys.v_syscall: System calls
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// vm.stats.sys.v_intr: Device interrupts
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// vm.stats.sys.v_soft: Software interrupts
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// vm.stats.vm.v_forks: Number of fork() calls
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return &execCollector{
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sysctls: []bsdSysctl{
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{
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name: "context_switches_total",
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description: "Context switches since system boot. Resets at architeture unsigned integer.",
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mib: "vm.stats.sys.v_swtch",
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},
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{
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name: "traps_total",
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description: "Traps since system boot. Resets at architeture unsigned integer.",
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mib: "vm.stats.sys.v_trap",
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},
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{
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name: "system_calls_total",
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description: "System calls since system boot. Resets at architeture unsigned integer.",
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mib: "vm.stats.sys.v_syscall",
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},
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{
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name: "device_interrupts_total",
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description: "Device interrupts since system boot. Resets at architeture unsigned integer.",
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mib: "vm.stats.sys.v_intr",
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},
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{
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name: "software_interrupts_total",
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description: "Software interrupts since system boot. Resets at architeture unsigned integer.",
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mib: "vm.stats.sys.v_soft",
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},
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{
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name: "forks_total",
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description: "Number of fork() calls since system boot. Resets at architeture unsigned integer.",
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mib: "vm.stats.vm.v_forks",
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},
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},
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}, nil
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}
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// Update pushes exec statistics onto ch
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func (c *execCollector) Update(ch chan<- prometheus.Metric) (err error) {
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for _, m := range c.sysctls {
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v, err := m.Value()
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if err != nil {
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return err
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}
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// We "know" all of our sysctls are CounterValues, let's skip
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// parsing them
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ch <- prometheus.MustNewConstMetric(
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prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "exec", m.name),
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m.description,
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nil, nil,
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), prometheus.CounterValue, v)
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}
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return nil
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}
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@ -0,0 +1,70 @@
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// Copyright 2017 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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// +build freebsd dragonfly
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// +build !nomeminfo
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package collector
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import (
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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)
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type bsdSysctlType uint8
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// BSD-specific sysctl value types. There is an impedience mismatch between
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// native C types, e.g. int vs long, and the golang unix.Sysctl variables
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const (
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// Default to uint32.
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bsdSysctlTypeUint32 bsdSysctlType = iota
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bsdSysctlTypeUint64
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)
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// Contains all the info needed to map a single bsd-sysctl to a prometheus value.
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type bsdSysctl struct {
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// Prometheus name
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name string
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// Simple prometheus description
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description string
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// Prometheus type
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valueType prometheus.ValueType
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// Sysctl name
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mib string
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// Sysctl data-type
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dataType bsdSysctlType
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}
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func (b bsdSysctl) Value() (float64, error) {
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var tmp32 uint32
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var tmp64 uint64
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var err error
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switch b.dataType {
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case bsdSysctlTypeUint32:
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tmp32, err = unix.SysctlUint32(b.mib)
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tmp64 = uint64(tmp32)
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case bsdSysctlTypeUint64:
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tmp64, err = unix.SysctlUint64(b.mib)
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}
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if err != nil {
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return 0, err
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}
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return float64(tmp64), nil
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}
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