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commit    8bd4b89e240cc6488f5e1523202cc2d27e9970c0
Author:   Robert Haas <rhaas@postgresql.org>
Date:     Fri Dec 17 16:32:02 2010 +0000
First released in: 9.1.0

    Try to save a kernel call in ResolveRecoveryConflictWithVirtualXIDs.
    
    If there's no work to be done, just exit quickly, before initialization.


 src/backend/storage/ipc/standby.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c
index 4f209eab688..b659c320585 100644
--- 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 */
 


[parent: 611fed371227]