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## Problem Continue work on prewarm started in PR https://github.com/neondatabase/neon/pull/11740 ## Summary of changes Implement prewarm using prefetch --------- Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* file_cache.h
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* Local File Cache definitions
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FILE_CACHE_h
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#define FILE_CACHE_h
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#include "neon_pgversioncompat.h"
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typedef struct FileCacheState
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{
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int32 vl_len_; /* varlena header (do not touch directly!) */
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uint32 magic;
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uint32 n_chunks;
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uint32 n_pages;
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uint16 chunk_size_log;
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BufferTag chunks[FLEXIBLE_ARRAY_MEMBER];
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/* followed by bitmap */
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} FileCacheState;
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/* GUCs */
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extern bool lfc_store_prefetch_result;
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/* functions for local file cache */
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extern void lfc_writev(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno, const void *const *buffers,
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BlockNumber nblocks);
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/* returns number of blocks read, with one bit set in *read for each */
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extern int lfc_readv_select(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno, void **buffers,
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BlockNumber nblocks, bits8 *mask);
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extern bool lfc_cache_contains(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno);
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extern int lfc_cache_containsv(NRelFileInfo rinfo, ForkNumber forkNum,
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BlockNumber blkno, int nblocks, bits8 *bitmap);
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extern void lfc_init(void);
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extern bool lfc_prefetch(NRelFileInfo rinfo, ForkNumber forknum, BlockNumber blkno,
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const void* buffer, XLogRecPtr lsn);
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extern FileCacheState* lfc_get_state(size_t max_entries);
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extern void lfc_prewarm(FileCacheState* fcs, uint32 n_workers);
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PGDLLEXPORT void lfc_prewarm_main(Datum main_arg);
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static inline bool
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lfc_read(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber blkno,
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void *buffer)
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{
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bits8 rv = 0;
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return lfc_readv_select(rinfo, forkNum, blkno, &buffer, 1, &rv) == 1;
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}
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static inline void
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lfc_write(NRelFileInfo rinfo, ForkNumber forkNum, BlockNumber blkno,
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const void *buffer)
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{
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return lfc_writev(rinfo, forkNum, blkno, &buffer, 1);
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}
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#endif /* FILE_CACHE_H */
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