Binder 大小

#Binder线程数量#

SystemServer     32个

App                     16个

搜索binder thread pool：

E IPCThreadState: binder thread pool (15 threads) starved for                 （appbinder线程被用光，

E IPCThreadState: binder thread pool (31 threads) starved for 108 ms    （SystemServer binder线程被用光，等待了108ms   "Waiting for thread to be free" 
 

#Binder 1次最大数量传输量#

默认1个进程最多分配1M - 8k的binder内核缓存大小，oneway异步分配1M - 8k/2

#define BINDER_VM_SIZE ((1*1024*1024) - (4096 *2)) // 1M - 8k

修改BINDER_VM_SIZE可以改变大小，但是最大是4M

ProcessState::ProcessState(): mDriverFD(open_driver())
    , mVMStart(MAP_FAILED)
    , mThreadCountLock(PTHREAD_MUTEX_INITIALIZER)
    , mThreadCountDecrement(PTHREAD_COND_INITIALIZER)
    , mExecutingThreadsCount(0)
    , mMaxThreads(DEFAULT_MAX_BINDER_THREADS)
    , mStarvationStartTimeMs(0)
    , mManagesContexts(false)
    , mBinderContextCheckFunc(NULL)
    , mBinderContextUserData(NULL)
    , mThreadPoolStarted(false)
    , mThreadPoolSeq(1)
{
  mVMStart = mmap(0, BINDER_VM_SIZE

#Binder 最大数量#

6000个，

Too many Binders sent to SYSTEM （Android能创建的Binder数量的最大值超过6000，非systemuid的binder调用会被kill掉，如果没等到binder调用返回，就不断发起新的binder调用就会抛出Proxy Binders异常