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pg_buffercache: Allow huge allocations.

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Otherwise, users who have configured shared_buffers >= 256GB won't
be able to use this module.  There probably aren't many of those, but
it doesn't hurt anything to fix it so that it works.

Backpatch to 9.4, where MemoryContextAllocHuge was introduced.  The
same problem exists in older branches, but there's no easy way to
fix it there.

KaiGai Kohei
This commit is contained in:
Robert Haas 2016-09-15 09:22:52 -04:00
parent 593d4e47db
commit 8a503526e4
1 changed files with 3 additions and 1 deletions
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4
contrib/pg_buffercache/pg_buffercache_pages.c
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@ -124,7 +124,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
fctx->tupdesc = BlessTupleDesc(tupledesc);
/* Allocate NBuffers worth of BufferCachePagesRec records. */
fctx->record = (BufferCachePagesRec *) palloc(sizeof(BufferCachePagesRec) * NBuffers);
fctx->record = (BufferCachePagesRec *)
MemoryContextAllocHuge(CurrentMemoryContext,
sizeof(BufferCachePagesRec) * NBuffers);
/* Set max calls and remember the user function context. */
funcctx->max_calls = NBuffers;