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Added optional container restore statistics

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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>
This commit is contained in:
Adrian Reber
2021-11-09 21:21:07 +00:00
parent 6202e8102b
commit 80e56fa12b
11 changed files with 186 additions and 83 deletions
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8
libpod/container_api.go
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@ -832,7 +832,11 @@ func (c *Container) Checkpoint(ctx context.Context, options ContainerCheckpointO
}
// Restore restores a container
func (c *Container) Restore(ctx context.Context, options ContainerCheckpointOptions) error {
// The return values *define.CRIUCheckpointRestoreStatistics and int64 (time
// the runtime needs to restore the container) are only set if
// options.PrintStats is set to true. Not setting options.PrintStats to true
// will return nil and 0.
func (c *Container) Restore(ctx context.Context, options ContainerCheckpointOptions) (*define.CRIUCheckpointRestoreStatistics, int64, error) {
if options.Pod == "" {
logrus.Debugf("Trying to restore container %s", c.ID())
} else {
@ -843,7 +847,7 @@ func (c *Container) Restore(ctx context.Context, options ContainerCheckpointOpti
defer c.lock.Unlock()
if err := c.syncContainer(); err != nil {
return err
return nil, 0, err
}
}
defer c.newContainerEvent(events.Restore)