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bcachefs: Increase size of cuckoo hash table on too many rehashes

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Also, improve the calculation of the new table size, so that it can
shrink when needed.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-08-15 13:02:55 -04:00
parent 58474f76a7
commit c2f6e16a67
1 changed files with 9 additions and 2 deletions
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11
fs/bcachefs/buckets_waiting_for_journal.c
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@ -93,7 +93,7 @@ int bch2_set_bucket_needs_journal_commit(struct buckets_waiting_for_journal *b,
.dev_bucket = (u64) dev << 56 | bucket,
.journal_seq = journal_seq,
};
size_t i, size, new_bits, nr_elements = 1, nr_rehashes = 0;
size_t i, size, new_bits, nr_elements = 1, nr_rehashes = 0, nr_rehashes_this_size = 0;
int ret = 0;
mutex_lock(&b->lock);
@ -106,7 +106,7 @@ int bch2_set_bucket_needs_journal_commit(struct buckets_waiting_for_journal *b,
for (i = 0; i < size; i++)
nr_elements += t->d[i].journal_seq > flushed_seq;
new_bits = t->bits + (nr_elements * 3 > size);
new_bits = ilog2(roundup_pow_of_two(nr_elements * 3));
n = kvmalloc(sizeof(*n) + (sizeof(n->d[0]) << new_bits), GFP_KERNEL);
if (!n) {
@ -115,7 +115,14 @@ int bch2_set_bucket_needs_journal_commit(struct buckets_waiting_for_journal *b,
}
retry_rehash:
if (nr_rehashes_this_size == 3) {
new_bits++;
nr_rehashes_this_size = 0;
}
nr_rehashes++;
nr_rehashes_this_size++;
bucket_table_init(n, new_bits);
tmp = new;