如何分配 pinned memory

#include '../common/book.h'#define SIZE    (10*1024*1024)int main( void ) {    float elapsedTime;    float MB = (float)100*SIZE*sizeof(int)/1024/1024;        elapsedTime = cuda_malloc_test( SIZE, true );    printf( 'Time using cudaMalloc:%3.1f ms\n',elapsedTime );    printf( '\tMB/s during copy up:%3.1f\n',MB/(elapsedTime/1000) );        elapsedTime = cuda_malloc_test( SIZE, false );    printf( 'Time using cudaMalloc:%3.1f ms\n',elapsedTime );    printf( '\tMB/s during copy down:%3.1f\n',MB/(elapsedTime/1000) );        elapsedTime = cuda_host_alloc_test( SIZE, true );    printf( 'Time using cudaHostAlloc:%3.1f ms\n',elapsedTime );    printf( '\tMB/s during copy up:%3.1f\n',MB/(elapsedTime/1000) );        elapsedTime = cuda_host_alloc_test( SIZE, false );    printf( 'Time using cudaHostAlloc:%3.1f ms\n',elapsedTime );    printf( '\tMB/s during copy down:%3.1f\n',MB/(elapsedTime/1000) );}