Merge "adbd: reduce queue depths."

static std::optional<bool> gFfsAioSupported;

// Not all USB controllers support operations larger than 16k, so don't go above that.

static constexpr size_t kUsbReadQueueDepth = 32;

// Also, each submitted operation does an allocation in the kernel of that size, so we want to

// minimize our queue depth while still maintaining a deep enough queue to keep the USB stack fed.

static constexpr size_t kUsbReadQueueDepth = 8;

static constexpr size_t kUsbReadSize = 4 * PAGE_SIZE;

static constexpr size_t kUsbWriteQueueDepth = 32;

static constexpr size_t kUsbWriteQueueDepth = 8;

static constexpr size_t kUsbWriteSize = 4 * PAGE_SIZE;

static const char* to_string(enum usb_functionfs_event_type type) {