sentry: capture CPU usage metadata for save.

PiperOrigin-RevId: 195466647
Change-Id: Ib5ca815f7b64a4881441e58567adedf344b206f1

1 files changed, 16 insertions, 0 deletions

diff --git a/pkg/sentry/state/state_metadata.go b/pkg/sentry/state/state_metadata.go
index ac374f428..b6d3dbcb4 100644
--- a/pkg/sentry/state/state_metadata.go
+++ b/pkg/sentry/state/state_metadata.go
@@ -17,13 +17,29 @@ package state
 import (
 	"fmt"
 	"time"
+
+	"gvisor.googlesource.com/gvisor/pkg/log"
 )
 
 // The save metadata keys for timestamp.
 const (
+	cpuUsage          = "cpu_usage"
 	metadataTimestamp = "timestamp"
 )
 
 func addSaveMetadata(m map[string]string) {
+	t, err := cpuTime()
+	if err != nil {
+		log.Warningf("Error getting cpu time: %v", err)
+	}
+	if previousMetadata != nil {
+		p, err := time.ParseDuration(previousMetadata[cpuUsage])
+		if err != nil {
+			log.Warningf("Error parsing previous runs' cpu time: %v", err)
+		}
+		t += p
+	}
+	m[cpuUsage] = t.String()
+
 	m[metadataTimestamp] = fmt.Sprintf("%v", time.Now())
 }