tmp

改code方式修改logcat buffer size

比如加在device下的device.mk里：

PRODUCT_PROPERTY_OVERRIDES += \
  ro.logd.size=5M

设置各种buffer size（main/system/crash）

system/core/logd/LogBuffer.cpp

void LogBuffer::init() {
    log_id_for_each(i) {
        mLastSet[i] = false;
        mLast[i] = mLogElements.begin();

        if (setSize(i, __android_logger_get_buffer_size(i))) {
            setSize(i, LOG_BUFFER_MIN_SIZE);
        }
    }

138  typedef enum log_id {
139    LOG_ID_MIN = 0,
140  
141    /** The main log buffer. This is the only log buffer available to apps. */
142    LOG_ID_MAIN = 0,
143    /** The radio log buffer. */
144    LOG_ID_RADIO = 1,
145    /** The event log buffer. */
146    LOG_ID_EVENTS = 2,
147    /** The system log buffer. */
148    LOG_ID_SYSTEM = 3,
149    /** The crash log buffer. */
150    LOG_ID_CRASH = 4,
151    /** The statistics log buffer. */
152    LOG_ID_STATS = 5,
153    /** The security log buffer. */
154    LOG_ID_SECURITY = 6,
155    /** The kernel log buffer. */
156    LOG_ID_KERNEL = 7,
157  
158    LOG_ID_MAX,
159  
160    /** Let the logging function choose the best log target. */
161    LOG_ID_DEFAULT = 0x7FFFFFFF
162  } log_id_t;