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checkpoint: add support to query for lazy page support 

Before adding the actual lazy migration support, this adds the feature
check for lazy-pages. Right now lazy migration, which is based on
userfaultd is only available in the criu-dev branch and not yet in a
release. As the check does not dependent on a certain version but on
a CRIU feature which can be queried it can be part of runC without a new
version check depending on a feature from criu-dev.

Signed-off-by: Adrian Reber <areber@redhat.com>
This commit is contained in:
Adrian Reber 2017-07-28 08:44:45 +00:00
parent aea4f21eec
commit a3a632ad28
1 changed files with 18 additions and 3 deletions
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15
libcontainer/container_linux.go
View File

@ -600,10 +600,25 @@ func (c *linuxContainer) checkCriuFeatures(criuOpts *CriuOpts, rpcOpts *criurpc.
logrus.Debugf("Feature check says: %s", criuFeatures)
missingFeatures := false
// The outer if checks if the fields actually exist
if (criuFeat.MemTrack != nil) &&
(criuFeatures.MemTrack != nil) {
// The inner if checks if they are set to true
if *criuFeat.MemTrack && !*criuFeatures.MemTrack {
missingFeatures = true
logrus.Debugf("CRIU does not support MemTrack")
}
}
// This needs to be repeated for every new feature check.
// Is there a way to put this in a function. Reflection?
if (criuFeat.LazyPages != nil) &&
(criuFeatures.LazyPages != nil) {
if *criuFeat.LazyPages && !*criuFeatures.LazyPages {
missingFeatures = true
logrus.Debugf("CRIU does not support LazyPages")
}
}
if missingFeatures {
return fmt.Errorf("CRIU is missing features")