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Commit8ae0f6a

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Add CHECK_FOR_INTERRUPTS in Evict{Rel,All}UnpinnedBuffers.
This commit adds CHECK_FOR_INTERRUPTS to the shared buffer iterationloops in EvictRelUnpinnedBuffers and EvictAllUnpinnedBuffers. Thesefunctions, used by pg_buffercache's pg_buffercache_evict_relation andpg_buffercache_evict_all, can now be interrupted during long-runningoperations.Backpatch to version 18, where these functions and their correspondingpg_buffercache functions were introduced.Author: Yuhang Qiu <iamqyh@gmail.com>Discussion:https://postgr.es/m/8DC280D4-94A2-4E7B-BAB9-C345891D0B78%40gmail.comBackpatch-through: 18
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‎src/backend/storage/buffer/bufmgr.c‎

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@@ -6685,6 +6685,8 @@ EvictAllUnpinnedBuffers(int32 *buffers_evicted, int32 *buffers_flushed,
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uint32buf_state;
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boolbuffer_flushed;
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CHECK_FOR_INTERRUPTS();
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buf_state=pg_atomic_read_u32(&desc->state);
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if (!(buf_state&BM_VALID))
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continue;
@@ -6735,6 +6737,8 @@ EvictRelUnpinnedBuffers(Relation rel, int32 *buffers_evicted,
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uint32buf_state=pg_atomic_read_u32(&(desc->state));
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boolbuffer_flushed;
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CHECK_FOR_INTERRUPTS();
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/* An unlocked precheck should be safe and saves some cycles. */
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if ((buf_state&BM_VALID)==0||
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!BufTagMatchesRelFileLocator(&desc->tag,&rel->rd_locator))

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