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Add get_pin_limit_hook #892

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Add get_pin_limit_hook #892

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3 changes: 2 additions & 1 deletion src/backend/storage/buffer/bufmgr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@
#include "utils/resowner.h"
#include "utils/timestamp.h"

uint32 (*get_pin_limit_hook)(void);

/* Note: these two macros only work on shared buffers, not local ones! */
#define BufHdrGetBlock(bufHdr) ((Block) (BufferBlocks + ((Size) (bufHdr)->buf_id) * BLCKSZ))
Expand Down Expand Up @@ -2131,7 +2132,7 @@ LimitAdditionalPins(uint32 *additional_pins)
return;

max_backends = MaxBackends + NUM_AUXILIARY_PROCS;
max_proportional_pins = NBuffers / max_backends;
max_proportional_pins = get_pin_limit_hook ? get_pin_limit_hook() : NBuffers / max_backends;

/*
* Subtract the approximate number of buffers already pinned by this
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1 change: 1 addition & 0 deletions src/include/storage/bufmgr.h
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Expand Up @@ -325,6 +325,7 @@ extern int GetAccessStrategyPinLimit(BufferAccessStrategy strategy);

extern void FreeAccessStrategy(BufferAccessStrategy strategy);

extern uint32 (*get_pin_limit_hook)(void);

/* inline functions */

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