54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
//go:build !ios
|
|
// +build !ios
|
|
|
|
package watchdog
|
|
|
|
import (
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/elastic/gosigar"
|
|
)
|
|
|
|
var (
|
|
sysmemFn = (*gosigar.Mem).Get
|
|
)
|
|
|
|
// SystemDriven starts a singleton system-driven watchdog.
|
|
//
|
|
// The system-driven watchdog keeps a threshold, above which GC will be forced.
|
|
// The watchdog polls the system utilization at the specified frequency. When
|
|
// the actual utilization exceeds the threshold, a GC is forced.
|
|
//
|
|
// This threshold is calculated by querying the policy every time that GC runs,
|
|
// either triggered by the runtime, or forced by us.
|
|
func SystemDriven(limit uint64, frequency time.Duration, policyCtor PolicyCtor) (err error, stopFn func()) {
|
|
if limit == 0 {
|
|
var sysmem gosigar.Mem
|
|
if err := sysmemFn(&sysmem); err != nil {
|
|
return fmt.Errorf("failed to get system memory stats: %w", err), nil
|
|
}
|
|
limit = sysmem.Total
|
|
}
|
|
|
|
policy, err := policyCtor(limit)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to construct policy with limit %d: %w", limit, err), nil
|
|
}
|
|
|
|
if err := start(UtilizationSystem); err != nil {
|
|
return err, nil
|
|
}
|
|
|
|
_watchdog.wg.Add(1)
|
|
var sysmem gosigar.Mem
|
|
go pollingWatchdog(policy, frequency, limit, func() (uint64, error) {
|
|
if err := sysmemFn(&sysmem); err != nil {
|
|
return 0, err
|
|
}
|
|
return sysmem.ActualUsed, nil
|
|
})
|
|
|
|
return nil, stop
|
|
}
|