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Provide ReadRecentBuffer() to re-pin buffers by ID.

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If you know the ID of a buffer that recently held a block that you would
like to pin, this function can be used check if it's still there.  It
can be used to avoid a second lookup in the buffer mapping table after
PrefetchBuffer() reports a cache hit.

Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA+hUKGJ4VJN8ttxScUFM8dOKX0BrBiboo5uz1cq=AovOddfHpA@mail.gmail.com
This commit is contained in:
Thomas Munro
2021-04-08 17:48:37 +12:00
parent 0827e8af70
commit 2f27f8c511
2 changed files with 80 additions and 0 deletions
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src/include/storage/bufmgr.h
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@@ -176,6 +176,8 @@ extern PrefetchBufferResult PrefetchSharedBuffer(struct SMgrRelationData *smgr_r
BlockNumber blockNum);
extern PrefetchBufferResult PrefetchBuffer(Relation reln, ForkNumber forkNum,
BlockNumber blockNum);
extern bool ReadRecentBuffer(RelFileNode rnode, ForkNumber forkNum,
BlockNumber blockNum, Buffer recent_buffer);
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
extern Buffer ReadBufferExtended(Relation reln, ForkNumber forkNum,
BlockNumber blockNum, ReadBufferMode mode,