mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-03 15:31:05 +01:00
cc2fd82008
This enables the collection of pressure stall information as exposed by the `/proc/pressure` interface added in the 4.20 release of the Linux kernel. Closes #1174 Signed-off-by: Daniele Sluijters <daenney@users.noreply.github.com>
106 lines
3.5 KiB
Go
106 lines
3.5 KiB
Go
// Copyright 2019 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 !nopressure
|
|
|
|
package collector
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/common/log"
|
|
"github.com/prometheus/procfs"
|
|
)
|
|
|
|
var (
|
|
psiResources = []string{"cpu", "io", "memory"}
|
|
)
|
|
|
|
type pressureStatsCollector struct {
|
|
cpu *prometheus.Desc
|
|
io *prometheus.Desc
|
|
ioFull *prometheus.Desc
|
|
mem *prometheus.Desc
|
|
memFull *prometheus.Desc
|
|
|
|
fs procfs.FS
|
|
}
|
|
|
|
func init() {
|
|
registerCollector("pressure", defaultEnabled, NewPressureStatsCollector)
|
|
}
|
|
|
|
// NewPressureStatsCollector returns a Collector exposing pressure stall information
|
|
func NewPressureStatsCollector() (Collector, error) {
|
|
fs, err := procfs.NewFS(*procPath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open procfs: %v", err)
|
|
}
|
|
|
|
return &pressureStatsCollector{
|
|
cpu: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "pressure", "cpu_waiting_seconds_total"),
|
|
"Total time in seconds that processes have waited for CPU time",
|
|
nil, nil,
|
|
),
|
|
io: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "pressure", "io_waiting_seconds_total"),
|
|
"Total time in seconds that processes have waited due to IO congestion",
|
|
nil, nil,
|
|
),
|
|
ioFull: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "pressure", "io_stalled_seconds_total"),
|
|
"Total time in seconds no process could make progress due to IO congestion",
|
|
nil, nil,
|
|
),
|
|
mem: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "pressure", "memory_waiting_seconds_total"),
|
|
"Total time in seconds that processes have waited for memory",
|
|
nil, nil,
|
|
),
|
|
memFull: prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, "pressure", "memory_stalled_seconds_total"),
|
|
"Total time in seconds no process could make progress due to memory congestion",
|
|
nil, nil,
|
|
),
|
|
fs: fs,
|
|
}, nil
|
|
}
|
|
|
|
// Update calls procfs.NewPSIStatsForResource for the different resources and updates the values
|
|
func (c *pressureStatsCollector) Update(ch chan<- prometheus.Metric) error {
|
|
for _, res := range psiResources {
|
|
log.Debugf("collecting statistics for resource: %s", res)
|
|
vals, err := c.fs.NewPSIStatsForResource(res)
|
|
if err != nil {
|
|
log.Debug("pressure information is unavailable, you need a Linux kernel >= 4.20 and/or CONFIG_PSI enabled for your kernel")
|
|
return nil
|
|
}
|
|
switch res {
|
|
case "cpu":
|
|
ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, float64(vals.Some.Total)/1000.0/1000.0)
|
|
case "io":
|
|
ch <- prometheus.MustNewConstMetric(c.io, prometheus.CounterValue, float64(vals.Some.Total)/1000.0/1000.0)
|
|
ch <- prometheus.MustNewConstMetric(c.ioFull, prometheus.CounterValue, float64(vals.Full.Total)/1000.0/1000.0)
|
|
case "memory":
|
|
ch <- prometheus.MustNewConstMetric(c.mem, prometheus.CounterValue, float64(vals.Some.Total)/1000.0/1000.0)
|
|
ch <- prometheus.MustNewConstMetric(c.memFull, prometheus.CounterValue, float64(vals.Full.Total)/1000.0/1000.0)
|
|
default:
|
|
log.Debugf("did not account for resource: %s", res)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|