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Add pg_buffercache_evict_{relation,all} functions

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In addition to the added functions, the pg_buffercache_evict() function now
shows whether the buffer was flushed.

pg_buffercache_evict_relation(): Evicts all shared buffers in a
relation at once.
pg_buffercache_evict_all(): Evicts all shared buffers at once.

Both functions provide mechanism to evict multiple shared buffers at
once. They are designed to address the inefficiency of repeatedly calling
pg_buffercache_evict() for each individual buffer, which can be time-consuming
when dealing with large shared buffer pools. (e.g., ~477ms vs. ~2576ms for
16GB of fully populated shared buffers).

These functions are intended for developer testing and debugging
purposes and are available to superusers only.

Minimal tests for the new functions are included. Also, there was no test for
pg_buffercache_evict(), test for this added too.

No new extension version is needed, as it was already increased this release
by ba2a3c2302.

Author: Nazir Bilal Yavuz <byavuz81@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Aidar Imamov <a.imamov@postgrespro.ru>
Reviewed-by: Joseph Koshakow <koshy44@gmail.com>
Discussion: https://postgr.es/m/CAN55FZ0h_YoSqqutxV6DES1RW8ig6wcA8CR9rJk358YRMxZFmw%40mail.gmail.com
This commit is contained in:
Andres Freund
2025-04-08 02:16:51 -04:00
parent d69d45a5a9
commit dcf7e1697b
8 changed files with 484 additions and 40 deletions
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9
src/include/storage/bufmgr.h
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@@ -304,7 +304,14 @@ extern uint32 GetAdditionalLocalPinLimit(void);
extern void LimitAdditionalPins(uint32 *additional_pins);
extern void LimitAdditionalLocalPins(uint32 *additional_pins);
extern bool EvictUnpinnedBuffer(Buffer buf);
extern bool EvictUnpinnedBuffer(Buffer buf, bool *buffer_flushed);
extern void EvictAllUnpinnedBuffers(int32 *buffers_evicted,
int32 *buffers_flushed,
int32 *buffers_skipped);
extern void EvictRelUnpinnedBuffers(Relation rel,
int32 *buffers_evicted,
int32 *buffers_flushed,
int32 *buffers_skipped);
/* in buf_init.c */
extern void BufferManagerShmemInit(void);