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96 lines
2.7 KiB
96 lines
2.7 KiB
// Copyright 2015 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 && !amd64
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// +build !nomeminfo,!amd64
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package collector
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import (
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"fmt"
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"log/slog"
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)
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/*
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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int
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sysctl_uvmexp(struct uvmexp *uvmexp)
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{
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static int uvmexp_mib[] = {CTL_VM, VM_UVMEXP};
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size_t sz = sizeof(struct uvmexp);
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if(sysctl(uvmexp_mib, 2, uvmexp, &sz, NULL, 0) < 0)
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return -1;
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return 0;
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}
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int
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sysctl_bcstats(struct bcachestats *bcstats)
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{
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static int bcstats_mib[] = {CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT};
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size_t sz = sizeof(struct bcachestats);
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if(sysctl(bcstats_mib, 3, bcstats, &sz, NULL, 0) < 0)
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return -1;
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return 0;
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}
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*/
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import "C"
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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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var uvmexp C.struct_uvmexp
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var bcstats C.struct_bcachestats
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if _, err := C.sysctl_uvmexp(&uvmexp); err != nil {
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return nil, fmt.Errorf("sysctl CTL_VM VM_UVMEXP failed: %w", err)
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}
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if _, err := C.sysctl_bcstats(&bcstats); err != nil {
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return nil, fmt.Errorf("sysctl CTL_VFS VFS_GENERIC VFS_BCACHESTAT failed: %w", err)
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}
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ps := float64(uvmexp.pagesize)
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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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