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 <jeff.janes@gmail.com>

diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index c34de3f160c9aba120857cc6a23d1742fc9234dd..5f8beb56f70baebaeddf2d6af07e24deeb73b1e1 100644 (file)
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -794,8 +794,7 @@ 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
@@ -835,8 +834,7 @@ ginInsertCleanup(GinState *ginstate,
            {
                ginEntryInsert(ginstate, attnum, key, category,
                               list, nlist, NULL);
-               if (vac_delay)
-                   vacuum_delay_point();
+               vacuum_delay_point();
            }
 
            /*
@@ -916,7 +914,7 @@ 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);