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process_metrics_linux.go: avoid calling os.Getpagesize() with every writeProcessMetrics() call

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It is enough to detect OS page size at the start and then use the detected value.
This removes syscall overhead from every writeProcessMetrics() call.

This is a follow-up for 7b14975dbb
Updates https://github.com/VictoriaMetrics/metrics/pull/76
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6457
This commit is contained in:
Aliaksandr Valialkin 2024-07-16 13:09:14 +02:00
parent 7a44715774
commit eba0da061f
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1 changed files with 6 additions and 1 deletions
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7
process_metrics_linux.go
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@ -16,6 +16,11 @@ import (
// See https://github.com/prometheus/procfs/blob/a4ac0826abceb44c40fc71daed2b301db498b93e/proc_stat.go#L40 .
const userHZ = 100
// Different environments may have different page size.
//
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/6457
var pageSizeBytes = uint64(os.Getpagesize())
// See http://man7.org/linux/man-pages/man5/proc.5.html
type procStat struct {
State byte
@ -80,7 +85,7 @@ func writeProcessMetrics(w io.Writer) {
WriteCounterUint64(w, "process_major_pagefaults_total", uint64(p.Majflt))
WriteCounterUint64(w, "process_minor_pagefaults_total", uint64(p.Minflt))
WriteGaugeUint64(w, "process_num_threads", uint64(p.NumThreads))
WriteGaugeUint64(w, "process_resident_memory_bytes", uint64(p.Rss)*uint64(os.Getpagesize()))
WriteGaugeUint64(w, "process_resident_memory_bytes", uint64(p.Rss)*pageSizeBytes)
WriteGaugeUint64(w, "process_start_time_seconds", uint64(startTimeSeconds))
WriteGaugeUint64(w, "process_virtual_memory_bytes", uint64(p.Vsize))
writeProcessMemMetrics(w)