Added optional container restore statistics

This adds the parameter '--print-stats' to 'podman container restore'.
With '--print-stats' Podman will measure how long Podman itself, the OCI
runtime and CRIU requires to restore a checkpoint and print out these
information. CRIU already creates process restore statistics which are
just read in addition to the added measurements. In contrast to just
printing out the ID of the restored container, Podman will now print
out JSON:

 # podman container restore --latest --print-stats
 {
     "podman_restore_duration": 305871,
     "container_statistics": [
         {
             "Id": "47b02e1d474b5d5fe917825e91ac653efa757c91e5a81a368d771a78f6b5ed20",
             "runtime_restore_duration": 140614,
             "criu_statistics": {
                 "forking_time": 5,
                 "restore_time": 67672,
                 "pages_restored": 14
             }
         }
     ]
 }

The output contains 'podman_restore_duration' which contains the
number of microseconds Podman required to restore the checkpoint. The
output also includes 'runtime_restore_duration' which is the time
the runtime needed to restore that specific container. Each container
also includes 'criu_statistics' which displays the timing information
collected by CRIU.

Signed-off-by: Adrian Reber <areber@redhat.com>

2 files changed, 11 insertions, 5 deletions

diff --git a/pkg/domain/entities/containers.go b/pkg/domain/entities/containers.go
index bab663ef7..8b7cd62d9 100644
--- a/pkg/domain/entities/containers.go
+++ b/pkg/domain/entities/containers.go
@@ -214,11 +214,14 @@ type RestoreOptions struct {
 	ImportPrevious  string
 	PublishPorts    []nettypes.PortMapping
 	Pod             string
+	PrintStats      bool
 }
 
 type RestoreReport struct {
-	Err error
-	Id  string //nolint
+	Err             error                                   `json:"-"`
+	Id              string                                  `json:"Id` //nolint
+	RuntimeDuration int64                                   `json:"runtime_restore_duration"`
+	CRIUStatistics  *define.CRIUCheckpointRestoreStatistics `json:"criu_statistics"`
 }
 
 type ContainerCreateReport struct {
diff --git a/pkg/domain/infra/abi/containers.go b/pkg/domain/infra/abi/containers.go
index c36bc5ccd..69c628669 100644
--- a/pkg/domain/infra/abi/containers.go
+++ b/pkg/domain/infra/abi/containers.go
@@ -560,6 +560,7 @@ func (ic *ContainerEngine) ContainerRestore(ctx context.Context, namesOrIds []st
 		IgnoreStaticMAC: options.IgnoreStaticMAC,
 		ImportPrevious:  options.ImportPrevious,
 		Pod:             options.Pod,
+		PrintStats:      options.PrintStats,
 	}
 
 	filterFuncs := []libpod.ContainerFilter{
@@ -582,10 +583,12 @@ func (ic *ContainerEngine) ContainerRestore(ctx context.Context, namesOrIds []st
 	}
 	reports := make([]*entities.RestoreReport, 0, len(cons))
 	for _, con := range cons {
-		err := con.Restore(ctx, restoreOptions)
+		criuStatistics, runtimeRestoreDuration, err := con.Restore(ctx, restoreOptions)
 		reports = append(reports, &entities.RestoreReport{
-			Err: err,
-			Id:  con.ID(),
+			Err:             err,
+			Id:              con.ID(),
+			RuntimeDuration: runtimeRestoreDuration,
+			CRIUStatistics:  criuStatistics,
 		})
 	}
 	return reports, nil