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ZFS Collector: Add zfetchstats functionality

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Signed-Off-By: Joe Handzik <joseph.t.handzik@hpe.com>
This commit is contained in:
Joe Handzik 2017-01-23 10:39:32 -06:00
parent 2a0c80cbe2
commit a3125ab4d9
5 changed files with 112 additions and 11 deletions
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33
collector/fixtures/e2e-output.txt
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@ -2350,6 +2350,39 @@ node_zfsArc_prefetch_metadata_misses 16071
# HELP node_zfsArc_size kstat.zfs.misc.arcstats.size
# TYPE node_zfsArc_size untyped
node_zfsArc_size 1.603939792e+09
# HELP node_zfsFetch_bogus_streams kstat.zfs.misc.zfetchstats.bogus_streams
# TYPE node_zfsFetch_bogus_streams untyped
node_zfsFetch_bogus_streams 0
# HELP node_zfsFetch_colinear_hits kstat.zfs.misc.zfetchstats.colinear_hits
# TYPE node_zfsFetch_colinear_hits untyped
node_zfsFetch_colinear_hits 0
# HELP node_zfsFetch_colinear_misses kstat.zfs.misc.zfetchstats.colinear_misses
# TYPE node_zfsFetch_colinear_misses untyped
node_zfsFetch_colinear_misses 11
# HELP node_zfsFetch_hits kstat.zfs.misc.zfetchstats.hits
# TYPE node_zfsFetch_hits untyped
node_zfsFetch_hits 7.067992e+06
# HELP node_zfsFetch_misses kstat.zfs.misc.zfetchstats.misses
# TYPE node_zfsFetch_misses untyped
node_zfsFetch_misses 11
# HELP node_zfsFetch_reclaim_failures kstat.zfs.misc.zfetchstats.reclaim_failures
# TYPE node_zfsFetch_reclaim_failures untyped
node_zfsFetch_reclaim_failures 11
# HELP node_zfsFetch_reclaim_successes kstat.zfs.misc.zfetchstats.reclaim_successes
# TYPE node_zfsFetch_reclaim_successes untyped
node_zfsFetch_reclaim_successes 0
# HELP node_zfsFetch_streams_noresets kstat.zfs.misc.zfetchstats.streams_noresets
# TYPE node_zfsFetch_streams_noresets untyped
node_zfsFetch_streams_noresets 2
# HELP node_zfsFetch_streams_resets kstat.zfs.misc.zfetchstats.streams_resets
# TYPE node_zfsFetch_streams_resets untyped
node_zfsFetch_streams_resets 0
# HELP node_zfsFetch_stride_hits kstat.zfs.misc.zfetchstats.stride_hits
# TYPE node_zfsFetch_stride_hits untyped
node_zfsFetch_stride_hits 7.06799e+06
# HELP node_zfsFetch_stride_misses kstat.zfs.misc.zfetchstats.stride_misses
# TYPE node_zfsFetch_stride_misses untyped
node_zfsFetch_stride_misses 0
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
# HELP process_max_fds Maximum number of open file descriptors.

13
collector/fixtures/proc/spl/kstat/zfs/zfetchstats Normal file
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@ -0,0 +1,13 @@
4 1 0x01 11 528 8010434610 345692669858836
name type data
hits 4 7067992
misses 4 11
colinear_hits 4 0
colinear_misses 4 11
stride_hits 4 7067990
stride_misses 4 0
reclaim_successes 4 0
reclaim_failures 4 11
streams_resets 4 0
streams_noresets 4 2
bogus_streams 4 0

5
collector/zfs.go
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@ -35,6 +35,7 @@ type zfsSubsystemName string
const (
arc = zfsSubsystemName("zfsArc")
zfetch = zfsSubsystemName("zfsFetch")
zpoolSubsystem = zfsSubsystemName("zfsPool")
)
@ -71,6 +72,10 @@ func (c *zfsCollector) Update(ch chan<- prometheus.Metric) (err error) {
return err
}
// Zfetchstats
err = c.updateZfetchstats(ch)
if err != nil { return err }
// Pool stats
return c.updatePoolStats(ch)
}

34
collector/zfs_linux.go
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@ -15,10 +15,10 @@ package collector
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
@ -27,31 +27,45 @@ import (
)
const (
zfsArcstatsProcpath = "spl/kstat/zfs/arcstats"
zfsProcpathBase = "spl/kstat/zfs/"
zfsArcstatsExt = "arcstats"
zfsFetchstatsExt = "zfetchstats"
)
func (c *zfsCollector) openArcstatsFile() (file *os.File, err error) {
file, err = os.Open(procFilePath(zfsArcstatsProcpath))
func (c *zfsCollector) openProcFile(path string) (file *os.File, err error) {
file, err = os.Open(procFilePath(path))
if err != nil {
log.Debugf("Cannot open %q for reading. Is the kernel module loaded?", procFilePath(zfsArcstatsProcpath))
log.Debugf("Cannot open %q for reading. Is the kernel module loaded?", procFilePath(path))
err = zfsNotAvailableError
}
return
}
func (c *zfsCollector) updateArcstats(ch chan<- prometheus.Metric) (err error) {
file, err := c.openArcstatsFile()
file, err := c.openProcFile(filepath.Join(zfsProcpathBase, zfsArcstatsExt))
if err != nil {
return err
}
defer file.Close()
return c.parseArcstatsProcfsFile(file, func(s zfsSysctl, v zfsMetricValue) {
return c.parseProcfsFile(file, zfsArcstatsExt, func(s zfsSysctl, v zfsMetricValue) {
ch <- c.constSysctlMetric(arc, s, v)
})
}
func (c *zfsCollector) parseArcstatsProcfsFile(reader io.Reader, handler func(zfsSysctl, zfsMetricValue)) (err error) {
func (c *zfsCollector) updateZfetchstats(ch chan<- prometheus.Metric) (err error) {
file, err := c.openProcFile(filepath.Join(zfsProcpathBase, zfsFetchstatsExt))
if err != nil {
return err
}
defer file.Close()
return c.parseProcfsFile(file, zfsFetchstatsExt, func(s zfsSysctl, v zfsMetricValue) {
ch <- c.constSysctlMetric(zfetch, s, v)
})
}
func (c *zfsCollector) parseProcfsFile(reader io.Reader, fmt_ext string, handler func(zfsSysctl, zfsMetricValue)) (err error) {
scanner := bufio.NewScanner(reader)
parseLine := false
@ -69,7 +83,7 @@ func (c *zfsCollector) parseArcstatsProcfsFile(reader io.Reader, handler func(zf
continue
}
key := fmt.Sprintf("kstat.zfs.misc.arcstats.%s", parts[0])
key := fmt.Sprintf("kstat.zfs.misc.%s.%s", fmt_ext, parts[0])
value, err := strconv.Atoi(parts[2])
if err != nil {
@ -79,7 +93,7 @@ func (c *zfsCollector) parseArcstatsProcfsFile(reader io.Reader, handler func(zf
}
if !parseLine {
return errors.New("did not parse a single arcstat metric")
return fmt.Errorf("did not parse a single %q metric", fmt_ext)
}
return scanner.Err()

38
collector/zfs_linux_test.go
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@ -31,7 +31,7 @@ func TestArcstatsParsing(t *testing.T) {
}
handlerCalled := false
err = c.parseArcstatsProcfsFile(arcstatsFile, func(s zfsSysctl, v zfsMetricValue) {
err = c.parseProcfsFile(arcstatsFile, "arcstats", func(s zfsSysctl, v zfsMetricValue) {
if s != zfsSysctl("kstat.zfs.misc.arcstats.hits") {
return
@ -53,3 +53,39 @@ func TestArcstatsParsing(t *testing.T) {
t.Fatal("Arcstats parsing handler was not called for some expected sysctls")
}
}
func TestZfetchstatsParsing(t *testing.T) {
zfetchstatsFile, err := os.Open("fixtures/proc/spl/kstat/zfs/zfetchstats")
if err != nil {
t.Fatal(err)
}
defer zfetchstatsFile.Close()
c := zfsCollector{}
if err != nil {
t.Fatal(err)
}
handlerCalled := false
err = c.parseProcfsFile(zfetchstatsFile, "zfetchstats", func(s zfsSysctl, v zfsMetricValue) {
if s != zfsSysctl("kstat.zfs.misc.zfetchstats.hits") {
return
}
handlerCalled = true
if v != zfsMetricValue(7067992) {
t.Fatalf("Incorrect value parsed from procfs data")
}
})
if err != nil {
t.Fatal(err)
}
if !handlerCalled {
t.Fatal("Zfetchstats parsing handler was not called for some expected sysctls")
}
}