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// Copyright 2023 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !nomeminfo
// +build !nomeminfo
package collector
import (
"golang.org/x/sys/unix"
"log/slog"
)
type meminfoCollector struct {
logger *slog.Logger
}
// NewMeminfoCollector returns a new Collector exposing memory stats.
func NewMeminfoCollector(logger *slog.Logger) (Collector, error) {
return &meminfoCollector{
logger: logger,
}, nil
}
func (c *meminfoCollector) getMemInfo() (map[string]float64, error) {
uvmexp, err := unix.SysctlUvmexp("vm.uvmexp2")
if err != nil {
return nil, err
}
ps := float64(uvmexp.Pagesize)
// see uvm(9)
return map[string]float64{
"active_bytes": ps * float64(uvmexp.Active),
"free_bytes": ps * float64(uvmexp.Free),
"inactive_bytes": ps * float64(uvmexp.Inactive),
"size_bytes": ps * float64(uvmexp.Npages),
"swap_size_bytes": ps * float64(uvmexp.Swpages),
"swap_used_bytes": ps * float64(uvmexp.Swpginuse),
"swapped_in_pages_bytes_total": ps * float64(uvmexp.Pgswapin),
"swapped_out_pages_bytes_total": ps * float64(uvmexp.Pgswapout),
"wired_bytes": ps * float64(uvmexp.Wired),
}, nil
}
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