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bcache: add priorityStats flag (#1621)

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* bcache: add priorityStats flag

Fixes #1593

Signed-off-by: Aleksei Zakharov <zaharov@selectel.ru>
This commit is contained in:
Aleksei Zakharov 2020-08-10 17:50:58 +03:00 committed by GitHub
parent 503e4fc848
commit 3b035c8fa1
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 34 additions and 17 deletions
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50
collector/bcache_linux.go
View file

@ -21,6 +21,11 @@ import (
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/bcache"
"gopkg.in/alecthomas/kingpin.v2"
)
var (
priorityStats = kingpin.Flag("collector.bcache.priorityStats", "Expose expensive priority stats.").Bool()
)
func init() {
@ -50,7 +55,13 @@ func NewBcacheCollector(logger log.Logger) (Collector, error) {
// Update reads and exposes bcache stats.
// It implements the Collector interface.
func (c *bcacheCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := c.fs.Stats()
var stats []*bcache.Stats
var err error
if *priorityStats {
stats, err = c.fs.Stats()
} else {
stats, err = c.fs.StatsWithoutPriority()
}
if err != nil {
return fmt.Errorf("failed to retrieve bcache stats: %w", err)
}
@ -259,23 +270,28 @@ func (c *bcacheCollector) updateBcacheStats(ch chan<- prometheus.Metric, s *bcac
extraLabel: []string{"cache_device"},
extraLabelValue: cache.Name,
},
}
if *priorityStats {
// metrics in /sys/fs/bcache/<uuid>/<cache>/priority_stats
{
name: "priority_stats_unused_percent",
desc: "The percentage of the cache that doesn't contain any data.",
value: float64(cache.Priority.UnusedPercent),
metricType: prometheus.GaugeValue,
extraLabel: []string{"cache_device"},
extraLabelValue: cache.Name,
},
{
name: "priority_stats_metadata_percent",
desc: "Bcache's metadata overhead.",
value: float64(cache.Priority.MetadataPercent),
metricType: prometheus.GaugeValue,
extraLabel: []string{"cache_device"},
extraLabelValue: cache.Name,
},
priorityStatsMetrics := []bcacheMetric{
{
name: "priority_stats_unused_percent",
desc: "The percentage of the cache that doesn't contain any data.",
value: float64(cache.Priority.UnusedPercent),
metricType: prometheus.GaugeValue,
extraLabel: []string{"cache_device"},
extraLabelValue: cache.Name,
},
{
name: "priority_stats_metadata_percent",
desc: "Bcache's metadata overhead.",
value: float64(cache.Priority.MetadataPercent),
metricType: prometheus.GaugeValue,
extraLabel: []string{"cache_device"},
extraLabelValue: cache.Name,
},
}
metrics = append(metrics, priorityStatsMetrics...)
}
allMetrics = append(allMetrics, metrics...)
}

1
end-to-end-test.sh
View file

@ -106,6 +106,7 @@ fi
--collector.wifi.fixtures="collector/fixtures/wifi" \
--collector.qdisc.fixtures="collector/fixtures/qdisc/" \
--collector.netclass.ignored-devices="(bond0|dmz|int)" \
--collector.bcache.priorityStats \
--collector.cpu.info \
--collector.cpu.info.flags-include="^(aes|avx.?|constant_tsc)$" \
--collector.cpu.info.bugs-include="^(cpu_meltdown|spectre_.*|mds)$" \