Try to save a kernel call in ResolveRecoveryConflictWithVirtualXIDs.

If there's no work to be done, just exit quickly, before initialization.

diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c
index 4f209eab68896f2006e8a8459ad11ba6cfc7ebf5..b659c320585c9aef6302c0723dc29ff1c16354db 100644 (file)
--- a/src/backend/storage/ipc/standby.c
+++ b/src/backend/storage/ipc/standby.c
@@ -193,6 +193,10 @@ ResolveRecoveryConflictWithVirtualXIDs(VirtualTransactionId *waitlist,
        TimestampTz waitStart;
        char       *new_status;
 
+       /* Fast exit, to avoid a kernel call if there's no work to be done. */
+       if (!VirtualTransactionIdIsValid(*waitlist))
+               return;
+
        waitStart = GetCurrentTimestamp();
        new_status = NULL;              /* we haven't changed the ps display */