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hash: use kernel readahead instead of bees_readahead to prefetch hash table

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The hash table is read sequentially and from a single thread, so
the kernel's implementation of readahead is appropriate here.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2024-11-24 22:11:42 -05:00
parent 37f5b1bfa8
commit cdcdf8e218
1 changed files with 2 additions and 2 deletions
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4
src/bees-hash.cc
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@ -446,8 +446,8 @@ BeesHashTable::fetch_missing_extent_by_index(uint64_t extent_index)
// If we are in prefetch, give the kernel a hint about the next extent
if (m_prefetch_running) {
// XXX: don't call this if bees_readahead is implemented by pread()
bees_readahead(m_fd, dirty_extent_offset + dirty_extent_size, dirty_extent_size);
// Use the kernel readahead here, because it might work for this use case
readahead(m_fd, dirty_extent_offset + dirty_extent_size, dirty_extent_size);
}
});
}