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Provide multi-block smgrprefetch().

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Previously smgrprefetch() could issue POSIX_FADV_WILLNEED advice for a
single block at a time.  Add an nblocks argument so that we can do the
same for a range of blocks.  This usually produces a single system call,
but might need to loop if it crosses a segment boundary.  Initially it
is only called with nblocks == 1, but proposed patches will make wider
calls.

Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> (earlier version)
Discussion: https://postgr.es/m/CA+hUKGJkOiOCa+mag4BF+zHo7qo=o9CFheB8=g6uT5TUm2gkvA@mail.gmail.com
This commit is contained in:
Thomas Munro
2023-12-16 16:14:47 +13:00
parent 59bd34c2fa
commit b485ad7f07
6 changed files with 35 additions and 17 deletions
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2
src/include/storage/md.h
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@@ -31,7 +31,7 @@ extern void mdextend(SMgrRelation reln, ForkNumber forknum,
extern void mdzeroextend(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, int nblocks, bool skipFsync);
extern bool mdprefetch(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum);
BlockNumber blocknum, int nblocks);
extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
void *buffer);
extern void mdwrite(SMgrRelation reln, ForkNumber forknum,

2
src/include/storage/smgr.h
View File

@@ -95,7 +95,7 @@ extern void smgrextend(SMgrRelation reln, ForkNumber forknum,
extern void smgrzeroextend(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, int nblocks, bool skipFsync);
extern bool smgrprefetch(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum);
BlockNumber blocknum, int nblocks);
extern void smgrread(SMgrRelation reln, ForkNumber forknum,
BlockNumber blocknum, void *buffer);
extern void smgrwrite(SMgrRelation reln, ForkNumber forknum,