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// Copyright 2017 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build freebsd dragonfly
// +build !noexec
package collector
import (
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
)
type execCollector struct {
sysctls []bsdSysctl
logger log.Logger
}
func init() {
registerCollector("exec", defaultEnabled, NewExecCollector)
}
// NewExecCollector returns a new Collector exposing system execution statistics.
func NewExecCollector(logger log.Logger) (Collector, error) {
// From sys/vm/vm_meter.c:
// All are of type CTLTYPE_UINT.
//
// vm.stats.sys.v_swtch: Context switches
// vm.stats.sys.v_trap: Traps
// vm.stats.sys.v_syscall: System calls
// vm.stats.sys.v_intr: Device interrupts
// vm.stats.sys.v_soft: Software interrupts
// vm.stats.vm.v_forks: Number of fork() calls
return &execCollector{
sysctls: []bsdSysctl{
{
name: "exec_context_switches_total",
description: "Context switches since system boot. Resets at architecture unsigned integer.",
mib: "vm.stats.sys.v_swtch",
},
{
name: "exec_traps_total",
description: "Traps since system boot. Resets at architecture unsigned integer.",
mib: "vm.stats.sys.v_trap",
},
{
name: "exec_system_calls_total",
description: "System calls since system boot. Resets at architecture unsigned integer.",
mib: "vm.stats.sys.v_syscall",
},
{
name: "exec_device_interrupts_total",
description: "Device interrupts since system boot. Resets at architecture unsigned integer.",
mib: "vm.stats.sys.v_intr",
},
{
name: "exec_software_interrupts_total",
description: "Software interrupts since system boot. Resets at architecture unsigned integer.",
mib: "vm.stats.sys.v_soft",
},
{
name: "exec_forks_total",
description: "Number of fork() calls since system boot. Resets at architecture unsigned integer.",
mib: "vm.stats.vm.v_forks",
},
},
logger: logger,
}, nil
}
// Update pushes exec statistics onto ch
func (c *execCollector) Update(ch chan<- prometheus.Metric) error {
for _, m := range c.sysctls {
v, err := m.Value()
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
namespace+"_"+m.name,
m.description,
nil, nil,
), prometheus.CounterValue, v)
}
return nil
}
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