memory_linux.go

//go:build linux
// +build linux

package memory

import "syscall"

func sysTotalMemory() uint64 {
	in := &syscall.Sysinfo_t{}
	err := syscall.Sysinfo(in)
	if err != nil {
		return 0
	}
	// If this is a 32-bit system, then these fields are
	// uint32 instead of uint64.
	// So we always convert to uint64 to match signature.
	return uint64(in.Totalram) * uint64(in.Unit)
}

func sysFreeMemory() uint64 {
	in := &syscall.Sysinfo_t{}
	err := syscall.Sysinfo(in)
	if err != nil {
		return 0
	}
	// If this is a 32-bit system, then these fields are
	// uint32 instead of uint64.
	// So we always convert to uint64 to match signature.
	return uint64(in.Freeram) * uint64(in.Unit)
}

func sysAvailableMemory() uint64 {
	in := &syscall.Sysinfo_t{}
	err := syscall.Sysinfo(in)
	if err != nil {
		return 0
	}
	// If this is a 32-bit system, then these fields are
	// uint32 instead of uint64.
	// So we always convert to uint64 to match signature.
	// Buffer/cache ram is included on linux since the kernel
	// will free this memory for applications if needed, and tends
	// to use almost all free memory for itself when it can.
	return (uint64(in.Freeram) + uint64(in.Bufferram)) * uint64(in.Unit)
}