On 24 March 2016 at 22:08, Jens Axboe <axboe@xxxxxx> wrote: > On 03/24/2016 05:54 AM, Baolin Wang wrote: >> >> This patch provides some tracepoints for the lifecycle of a request from >> fetching to completion to help with performance analysis of MMC subsystem. > > > Most of these already exist as block layer trace points, why do we need mmc > specific ones? Currently the MMC core does not have any tracepoints for use with ftrace. These are very useful as they provide a very low overhead runtime controllable way of getting diagnostics from the system which is capable of recording a great deal of information without impacting system performance. We have tracepoints in the block layer so we can do some trace of MMC but none in MMC itself so adding some where appropriate would help people follow the activity of subsystem. > > > -- > Jens Axboe > -- Baolin.wang Best Regards -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
