logd: prune more aggressively when over the top

}

// If we're using more than 256K of memory for log entries, prune

// 10% of the log entries.

// at least 10% of the log entries.

//

// mLogElementsLock must be held when this function is called.

void LogBuffer::maybePrune(log_id_t id) {

    if (mSizes[id] > LOG_BUFFER_SIZE) {

        prune(id, mElements[id] / 10);

    unsigned long sizes = mSizes[id];

    if (sizes > LOG_BUFFER_SIZE) {

        unsigned long sizeOver90Percent = sizes - ((LOG_BUFFER_SIZE * 9) / 10);

        unsigned long elements = mElements[id];

        unsigned long pruneRows = elements * sizeOver90Percent / sizes;

        elements /= 10;

        if (pruneRows <= elements) {

            pruneRows = elements;

        }

        prune(id, pruneRows);

    }

}