for perfctr-2.6.x, when vperfctr_open() return error, call vperfctr_open_mode(0)
for perfctr-2.6.x, when vperfctr_open() return error, call vperfctr_open_mode(0)

arm-hpc/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi