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Diffstat (limited to 'pkg/sentry/kernel/session_refs.go')
| -rw-r--r-- | pkg/sentry/kernel/session_refs.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/pkg/sentry/kernel/session_refs.go b/pkg/sentry/kernel/session_refs.go index 84919943d..0186a0e6d 100644 --- a/pkg/sentry/kernel/session_refs.go +++ b/pkg/sentry/kernel/session_refs.go @@ -20,6 +20,14 @@ var Sessionobj *Session // Refs implements refs.RefCounter. It keeps a reference count using atomic // operations and calls the destructor when the count reaches zero. // +// NOTE: Do not introduce additional fields to the Refs struct. It is used by +// many filesystem objects, and we want to keep it as small as possible (i.e., +// the same size as using an int64 directly) to avoid taking up extra cache +// space. In general, this template should not be extended at the cost of +// performance. If it does not offer enough flexibility for a particular object +// (example: b/187877947), we should implement the RefCounter/CheckedObject +// interfaces manually. +// // +stateify savable type SessionRefs struct { // refCount is composed of two fields: |