What do the multiple reported times mean when a Full GC occurs as the result of a concurrent mode failure?

Issue

• How to interpret concurrent mode failure timestamps in Garbage Collection (GC) logs

• In the following log snippet, 1.264, is the CPU, while 72740 is what is classified as wall time', but at the end of the gc log entry, have another two elements about cpu time, that would be user and sys, do they have any relation with '1.264' I can find from the gc log entry(so does '72740.163' and '72729.22')? And now I have '1.264/72740.163' and 'Times: user=3.86 sys=0.00, real=2.86 secs' two block about, which of the block is more meaningful to me?

  8477579.922: [Full GC 8477579.922: [CMS8477580.934: [CMS-concurrent-mark: 1.264/72740.163 secs] [Times: user=393.00 sys=43.13, real=72729.22 secs]  (concurrent mode failure): 3075148K->594654K(3145728K), 2.8537840 secs] 4018892K->594654K(4089472K), [CMS Perm : 160302K->159744K(393216K)] icms_dc=22 , 2.8540090 secs] [Times: user=3.86 sys=0.00, real=2.86 secs]
  

• Need more information to understand / interpret the GC logs where concurrent mode failure is concerned