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95 lines
2.5 KiB
95 lines
2.5 KiB
// Copyright 2020 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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//go:build !nomeminfo
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// +build !nomeminfo
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package collector
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import (
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"log/slog"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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const (
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CTL_VFS = 10
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VFS_GENERIC = 0
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VFS_BCACHESTAT = 3
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)
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type bcachestats struct {
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Numbufs int64
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Numbufpages int64
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Numdirtypages int64
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Numcleanpages int64
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Pendingwrites int64
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Pendingreads int64
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Numwrites int64
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Numreads int64
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Cachehits int64
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Busymapped int64
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Dmapages int64
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Highpages int64
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Delwribufs int64
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Kvaslots int64
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Kvaslots_avail int64
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Highflips int64
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Highflops int64
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Dmaflips int64
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}
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type meminfoCollector struct {
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logger *slog.Logger
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}
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// NewMeminfoCollector returns a new Collector exposing memory stats.
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func NewMeminfoCollector(logger *slog.Logger) (Collector, error) {
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return &meminfoCollector{
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logger: logger,
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}, nil
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}
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func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
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uvmexpb, err := unix.SysctlRaw("vm.uvmexp")
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if err != nil {
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return nil, err
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}
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mib := [3]_C_int{CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT}
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bcstatsb, err := sysctl(mib[:])
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if err != nil {
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return nil, err
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}
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uvmexp := *(*unix.Uvmexp)(unsafe.Pointer(&uvmexpb[0]))
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ps := float64(uvmexp.Pagesize)
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bcstats := *(*bcachestats)(unsafe.Pointer(&bcstatsb[0]))
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// see uvm(9)
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return map[string]float64{
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"active_bytes": ps * float64(uvmexp.Active),
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"cache_bytes": ps * float64(bcstats.Numbufpages),
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"free_bytes": ps * float64(uvmexp.Free),
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"inactive_bytes": ps * float64(uvmexp.Inactive),
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"size_bytes": ps * float64(uvmexp.Npages),
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"swap_size_bytes": ps * float64(uvmexp.Swpages),
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"swap_used_bytes": ps * float64(uvmexp.Swpginuse),
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"swapped_in_pages_bytes_total": ps * float64(uvmexp.Pgswapin),
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"swapped_out_pages_bytes_total": ps * float64(uvmexp.Pgswapout),
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"wired_bytes": ps * float64(uvmexp.Wired),
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}, nil
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}
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