Make GIN's cleanup pending list process interruptable

Cleanup process could be called by ordinary insert/update and could take a lot
of time. Add vacuum_delay_point() to make this process interruptable. Under
vacuum this call will also throttle a vacuum process to decrease system load,
called from insert/update it will not throttle, and that reduces a latency.

Backpatch for all supported branches.

Jeff Janes 

diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 7b4f85df88117048ee0d8dabcd5b9cb07f1243ed..65471eb9f23bd6e4512aa18ee3f98d120f7a3fa7 100644 (file)
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -801,8 +801,7 @@ ginInsertCleanup(GinState *ginstate,
         */
        processPendingPage(&accum, &datums, page, FirstOffsetNumber);
 
-       if (vac_delay)
-           vacuum_delay_point();
+       vacuum_delay_point();
 
        /*
         * Is it time to flush memory to disk?  Flush if we are at the end of
@@ -842,8 +841,7 @@ ginInsertCleanup(GinState *ginstate,
            {
                ginEntryInsert(ginstate, attnum, key, category,
                               list, nlist, NULL);
-               if (vac_delay)
-                   vacuum_delay_point();
+               vacuum_delay_point();
            }
 
            /*
@@ -923,7 +921,7 @@ ginInsertCleanup(GinState *ginstate,
        /*
         * Read next page in pending list
         */
-       CHECK_FOR_INTERRUPTS();
+       vacuum_delay_point();
        buffer = ReadBuffer(index, blkno);
        LockBuffer(buffer, GIN_SHARE);
        page = BufferGetPage(buffer);