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When sync log compaction, in BlueFS::_compact_log_sync_LNF_LD, l_bluefs_log_compactions is first counted in _rewrite_log_and_layout_sync_LNF_LD.
After _rewrite_log_and_layout_sync_LNF_LD, l_bluefs_log_compactions is second counted.

@Bingrun Liu BlueFS::_compact_log_sync_LNF_LD() {
dout(10) << func << dendl;
uint8_t prefer_bdev; {
std::lock_guard ll(log.lock);
prefer_bdev =
vselector->select_prefer_bdev(log.writer->file->vselector_hint);
}
_rewrite_log_and_layout_sync_LNF_LD(true, //here is first counted
BDEV_DB,
prefer_bdev,
prefer_bdev,
0,
super.memorized_layout);
logger->inc(l_bluefs_log_compactions); // here is second counted
}
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