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commit    4adbaa36ca8b0042ce24be187542e846ad3a7e51
Author:   Robert Haas <rhaas@postgresql.org>
Date:     Fri Jun 06 12:18:15 2025 +0000
First released in: 18.0, 13.22, 14.19, 15.14, 16.10, 17.6

    pg_prewarm: Allow autoprewarm to use more than 1GB to dump blocks.
    
    Reported-by: Daria Shanina <vilensipkdm@gmail.com>
    Author: Daria Shanina <vilensipkdm@gmail.com>
    Author: Robert Haas <robertmhaas@gmail.com>
    Backpatch-through: 13


 contrib/pg_prewarm/autoprewarm.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 31be24fc9c3..65d3ee2e163 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -597,8 +597,15 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		return 0;
 	}
 
-	block_info_array =
-		(BlockInfoRecord *) palloc(sizeof(BlockInfoRecord) * NBuffers);
+	/*
+	 * With sufficiently large shared_buffers, allocation will exceed 1GB, so
+	 * allow for a huge allocation to prevent outright failure.
+	 *
+	 * (In the future, it might be a good idea to redesign this to use a more
+	 * memory-efficient data structure.)
+	 */
+	block_info_array = (BlockInfoRecord *)
+		palloc_extended((sizeof(BlockInfoRecord) * NBuffers), MCXT_ALLOC_HUGE);
 
 	for (num_blocks = 0, i = 0; i < NBuffers; i++)
 	{


[parent: 626b439e367d]