ben@Lappy ~ $ sudo perf stat -a -e mmc:* -e block:* dd if=/tmp/file.r of=/dev/mmcblk0 bs=1M count=256 conv=fsync
256+0 records in
256+0 records out
268435456 bytes (268 MB, 256 MiB) copied, 9.22471 s, 29.1 MB/s

 Performance counter stats for 'system wide':

             1,024      mmc:mmc_request_start                                       
             1,024      mmc:mmc_request_done                                        
                63      block:block_touch_buffer                                    
            65,558      block:block_dirty_buffer                                    
                 0      block:block_rq_requeue                                      
               561      block:block_rq_complete                                     
               537      block:block_rq_insert                                       
               560      block:block_rq_issue                                        
                 0      block:block_bio_bounce                                      
                 0      block:block_bio_complete                                    
            65,034      block:block_bio_backmerge                                   
                 0      block:block_bio_frontmerge                                   
            65,593      block:block_bio_queue                                       
               559      block:block_getrq                                           
                 0      block:block_sleeprq                                         
               522      block:block_plug                                            
               522      block:block_unplug                                          
                 0      block:block_split                                           
                57      block:block_bio_remap                                       
                 0      block:block_rq_remap                                        

       9.227203231 seconds time elapsed