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Real-time performance of Linux have been improved. But I have investigated on embedded Linux applications and found that some applications which were migrated from existing real-time OS use tasks as subroutines and caused performance problems. In addition, migration of existing applications to Linux is a little harder if the API is not POSIX. In this presentation, I will present on OSEK/VDX over Linux for migrating existing embedded applications and/or training on embedded applications. The task switching performance will be very important on migrations. Therefore, I used micro task switching method in a process. I used open source OSEK/VDX implementation and implement some additional futures. The task switching time, the signal to task raise time and the interrupt to task raise time are evaluated on proposed system versus bare Linux.