caches.h

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// Copyright (c) 2024-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_KERNEL_CACHES_H
#define BITCOIN_KERNEL_CACHES_H
 
#include <util/byte_units.h>
 
#include <algorithm>
#include <cstdint>
#include <limits>

inline constexpr uint64_t MIN_DBCACHE_BYTES{4_MiB};
inline constexpr uint64_t MAX_DBCACHE_BYTES{sizeof(void*) == 4 ? 1_GiB : std::numeric_limits<uint64_t>::max()};
inline constexpr uint64_t DEFAULT_KERNEL_CACHE{450_MiB};
inline constexpr uint64_t DEFAULT_DB_CACHE_BATCH{32_MiB};

inline constexpr uint64_t MAX_BLOCK_DB_CACHE{2_MiB};
inline constexpr uint64_t MAX_COINS_DB_CACHE{8_MiB};
 
namespace kernel {
struct CacheSizes {
    uint64_t block_tree_db;
    uint64_t coins_db;
    uint64_t coins;
 
    CacheSizes(uint64_t total_cache)
    {
        block_tree_db = std::min(total_cache / 8, MAX_BLOCK_DB_CACHE);
        total_cache -= block_tree_db;
        coins_db = std::min(total_cache / 2, MAX_COINS_DB_CACHE);
        total_cache -= coins_db;
        coins = total_cache; // the rest goes to the coins cache
    }
};
} // namespace kernel
 
#endif // BITCOIN_KERNEL_CACHES_H