7132029: G1: mixed GC phase lasts for longer than it should Summary: Revamp of the mechanism that chooses old regions for inclusion in the CSet. It simplifies the code and introduces min and max bounds on the number of old regions added to the CSet at each mixed GC to avoid pathological cases. It also ensures that when we do a mixed GC we'll always find old regions to add to the CSet (i.e., it eliminates the case where a mixed GC will collect no old regions which can happen today). Reviewed-by: johnc, brutisso

7129514: time warp warnings after 7117303 Summary: Replace calls to os::javaTimeMillis() that are used to update the milliseconds since the last GC to an equivalent that uses a monotonically non-decreasing time source. Reviewed-by: ysr, jmasa

7129892: G1: explicit marking cycle initiation might fail to initiate a marking cycle Summary: If we try to schedule an initial-mark GC in order to explicit start a conc mark cycle and it gets pre-empted by antoher GC, we should retry the attempt as long as it's appropriate for the GC cause. Reviewed-by: brutisso, johnc

7144296: PS: Optimize nmethods processing Summary: Prunes scavenge roots in code list every young GC, promote objects directly pointed by the code immediately Reviewed-by: johnc, jcoomes

Merge

7140866: assert(covered) failed: Card for end of new region not committed Summary: resize covered region only after successfully mapping shared archive Reviewed-by: brutisso, ysr Contributed-by: dean.long@oracle.com