Expose /proc/pressure (#1261)
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>pull/1325/head
Daniele Sluijters
7 years ago
committed by
Ben Kochie
parent
4e5c4d464f
commit
cc2fd82008
@ -0,0 +1 @@ |
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some avg10=0.00 avg60=0.00 avg300=0.00 total=14036781 |
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@ -0,0 +1,2 @@ |
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some avg10=0.18 avg60=0.34 avg300=0.10 total=159886802 |
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full avg10=0.18 avg60=0.34 avg300=0.10 total=159229614 |
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@ -0,0 +1,2 @@ |
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some avg10=0.00 avg60=0.00 avg300=0.00 total=0 |
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full avg10=0.00 avg60=0.00 avg300=0.00 total=0 |
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@ -0,0 +1,105 @@ |
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// Copyright 2019 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 !nopressure
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package collector |
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import ( |
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"fmt" |
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"github.com/prometheus/client_golang/prometheus" |
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"github.com/prometheus/common/log" |
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"github.com/prometheus/procfs" |
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) |
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var ( |
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psiResources = []string{"cpu", "io", "memory"} |
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) |
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type pressureStatsCollector struct { |
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cpu *prometheus.Desc |
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io *prometheus.Desc |
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ioFull *prometheus.Desc |
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mem *prometheus.Desc |
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memFull *prometheus.Desc |
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fs procfs.FS |
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} |
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func init() { |
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registerCollector("pressure", defaultEnabled, NewPressureStatsCollector) |
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} |
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// NewPressureStatsCollector returns a Collector exposing pressure stall information
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func NewPressureStatsCollector() (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: %v", err) |
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} |
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return &pressureStatsCollector{ |
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cpu: prometheus.NewDesc( |
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prometheus.BuildFQName(namespace, "pressure", "cpu_waiting_seconds_total"), |
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"Total time in seconds that processes have waited for CPU time", |
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nil, nil, |
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), |
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io: prometheus.NewDesc( |
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prometheus.BuildFQName(namespace, "pressure", "io_waiting_seconds_total"), |
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"Total time in seconds that processes have waited due to IO congestion", |
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nil, nil, |
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), |
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ioFull: prometheus.NewDesc( |
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prometheus.BuildFQName(namespace, "pressure", "io_stalled_seconds_total"), |
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"Total time in seconds no process could make progress due to IO congestion", |
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nil, nil, |
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), |
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mem: prometheus.NewDesc( |
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prometheus.BuildFQName(namespace, "pressure", "memory_waiting_seconds_total"), |
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"Total time in seconds that processes have waited for memory", |
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nil, nil, |
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), |
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memFull: prometheus.NewDesc( |
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prometheus.BuildFQName(namespace, "pressure", "memory_stalled_seconds_total"), |
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"Total time in seconds no process could make progress due to memory congestion", |
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nil, nil, |
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), |
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fs: fs, |
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}, nil |
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} |
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// Update calls procfs.NewPSIStatsForResource for the different resources and updates the values
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func (c *pressureStatsCollector) Update(ch chan<- prometheus.Metric) error { |
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for _, res := range psiResources { |
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log.Debugf("collecting statistics for resource: %s", res) |
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vals, err := c.fs.NewPSIStatsForResource(res) |
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if err != nil { |
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log.Debug("pressure information is unavailable, you need a Linux kernel >= 4.20 and/or CONFIG_PSI enabled for your kernel") |
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return nil |
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} |
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switch res { |
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case "cpu": |
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ch <- prometheus.MustNewConstMetric(c.cpu, prometheus.CounterValue, float64(vals.Some.Total)/1000.0/1000.0) |
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case "io": |
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ch <- prometheus.MustNewConstMetric(c.io, prometheus.CounterValue, float64(vals.Some.Total)/1000.0/1000.0) |
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ch <- prometheus.MustNewConstMetric(c.ioFull, prometheus.CounterValue, float64(vals.Full.Total)/1000.0/1000.0) |
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case "memory": |
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ch <- prometheus.MustNewConstMetric(c.mem, prometheus.CounterValue, float64(vals.Some.Total)/1000.0/1000.0) |
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ch <- prometheus.MustNewConstMetric(c.memFull, prometheus.CounterValue, float64(vals.Full.Total)/1000.0/1000.0) |
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default: |
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log.Debugf("did not account for resource: %s", res) |
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} |
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} |
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return nil |
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} |
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