On 1/1/15 7:59 PM, Shaohua Li wrote:
I'm wondering how we could use the perf to implament a clock_gettime. reading the perf fd or using ioctl is slow so reading the mmap ringbuffer is the only option. But as far as I know the ringbuffer has data only when an event is generated. Between two events, there is nothing we can read from the ringbuffer. Then how can application get time info in the interval?
Are you wanting to read perf_clock from userspace? David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
