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storage
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Only read storage.conf once 

Currently running a simple container runs and stats configuration
storage.conf files multiple times on a simple container run.

This PR cuts the opens and stats in half by caching the first read.
This speeds up start by about 10-20 microseconds.

If container engines want to react to storage files changing, added a
new function UpdateStoreOptions to allow engines to reload options.

Fixes: https://github.com/containers/storage/issues/1403

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
This commit is contained in:
Daniel J Walsh 2022-10-20 08:14:03 -04:00
parent db44035e3c
commit 9e06c38dfe
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GPG Key ID: A2DF901DABE2C028
1 changed files with 20 additions and 2 deletions
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22
types/options.go
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@ -35,6 +35,9 @@ const (
var (
defaultStoreOptionsOnce sync.Once
loadDefaultStoreOptionsErr error
once sync.Once
storeOptions StoreOptions
storeError error
)
func loadDefaultStoreOptions() {
@ -167,8 +170,8 @@ func defaultStoreOptionsIsolated(rootless bool, rootlessUID int, storageConf str
return storageOpts, nil
}
// DefaultStoreOptions returns the default storage ops for containers
func DefaultStoreOptions(rootless bool, rootlessUID int) (StoreOptions, error) {
// loadStoreOptions returns the default storage ops for containers
func loadStoreOptions(rootless bool, rootlessUID int) (StoreOptions, error) {
storageConf, err := DefaultConfigFile(rootless && rootlessUID != 0)
if err != nil {
return defaultStoreOptions, err
@ -176,6 +179,21 @@ func DefaultStoreOptions(rootless bool, rootlessUID int) (StoreOptions, error) {
return defaultStoreOptionsIsolated(rootless, rootlessUID, storageConf)
}
// UpdateOptions should be called iff container engine recieved a SIGHUP,
// otherwise use DefaultStoreOptions
func UpdateStoreOptions(rootless bool, rootlessUID int) (StoreOptions, error) {
storeOptions, storeError = loadStoreOptions(rootless, rootlessUID)
return storeOptions, storeError
}
// DefaultStoreOptions returns the default storage ops for containers
func DefaultStoreOptions(rootless bool, rootlessUID int) (StoreOptions, error) {
once.Do(func() {
storeOptions, storeError = loadStoreOptions(rootless, rootlessUID)
})
return storeOptions, storeError
}
// StoreOptions is used for passing initialization options to GetStore(), for
// initializing a Store object and the underlying storage that it controls.
type StoreOptions struct {