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mempool: use FeeFrac for calculating descendant score

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This commit is contained in:
Sebastian Falbesoner
2025-06-24 02:20:03 +02:00
parent e95bfc1d53
commit ac9c113bd2
1 changed files with 8 additions and 20 deletions
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28
src/txmempool.h
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@@ -93,36 +93,24 @@ class CompareTxMemPoolEntryByDescendantScore
public:
bool operator()(const CTxMemPoolEntry& a, const CTxMemPoolEntry& b) const
{
double a_mod_fee, a_size, b_mod_fee, b_size;
FeeFrac f1 = GetModFeeAndSize(a);
FeeFrac f2 = GetModFeeAndSize(b);
GetModFeeAndSize(a, a_mod_fee, a_size);
GetModFeeAndSize(b, b_mod_fee, b_size);
// Avoid division by rewriting (a/b > c/d) as (a*d > c*b).
double f1 = a_mod_fee * b_size;
double f2 = a_size * b_mod_fee;
if (f1 == f2) {
if (FeeRateCompare(f1, f2) == 0) {
return a.GetTime() >= b.GetTime();
}
return f1 < f2;
}
// Return the fee/size we're using for sorting this entry.
void GetModFeeAndSize(const CTxMemPoolEntry &a, double &mod_fee, double &size) const
FeeFrac GetModFeeAndSize(const CTxMemPoolEntry &a) const
{
// Compare feerate with descendants to feerate of the transaction, and
// return the fee/size for the max.
double f1 = (double)a.GetModifiedFee() * a.GetSizeWithDescendants();
double f2 = (double)a.GetModFeesWithDescendants() * a.GetTxSize();
if (f2 > f1) {
mod_fee = a.GetModFeesWithDescendants();
size = a.GetSizeWithDescendants();
} else {
mod_fee = a.GetModifiedFee();
size = a.GetTxSize();
}
return std::max<FeeFrac>(
FeeFrac(a.GetModFeesWithDescendants(), a.GetSizeWithDescendants()),
FeeFrac(a.GetModifiedFee(), a.GetTxSize())
);
}
};