[#22] Add CMS-concurrent-* gc events parsing.

[ducky-hong]

• CMS_CONCURRENT LogType added on gc_model.
• CMS concurrent cpu time, wall time added.
• Avoid potential NPE on CmsLogParser#parseGcEvent.

[xeoh]

We know that some CMS concurrent mode fail in middle of procedure. I think dividing concurrent mode more specific will give us more informations.

Category of concurrent mode.

2015-05-26T16:23:07.321-0200: 64.425: [GC (CMS Initial Mark) [1 CMS-initial-mark: 10812086K(11901376K)] 10887844K(12514816K), 0.0001997 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
2015-05-26T16:23:07.321-0200: 64.425: [CMS-concurrent-mark-start]
2015-05-26T16:23:07.357-0200: 64.460: [CMS-concurrent-mark: 0.035/0.035 secs] [Times: user=0.07 sys=0.00, real=0.03 secs]
2015-05-26T16:23:07.357-0200: 64.460: [CMS-concurrent-preclean-start]
2015-05-26T16:23:07.373-0200: 64.476: [CMS-concurrent-preclean: 0.016/0.016 secs] [Times: user=0.02 sys=0.00, real=0.02 secs]
2015-05-26T16:23:07.373-0200: 64.476: [CMS-concurrent-abortable-preclean-start]
2015-05-26T16:23:08.446-0200: 65.550: [CMS-concurrent-abortable-preclean: 0.167/1.074 secs] [Times: user=0.20 sys=0.00, real=1.07 secs]
2015-05-26T16:23:08.447-0200: 65.550: [GC (CMS Final Remark) [YG occupancy: 387920 K (613440 K)]65.550: [Rescan (parallel) , 0.0085125 secs]65.559: [weak refs processing, 0.0000243 secs]65.559: [class unloading, 0.0013120 secs]65.560: [scrub symbol table, 0.0008345 secs]65.561: [scrub string table, 0.0001759 secs][1 CMS-remark: 10812086K(11901376K)] 11200006K(12514816K), 0.0110730 secs] [Times: user=0.06 sys=0.00, real=0.01 secs]
2015-05-26T16:23:08.458-0200: 65.561: [CMS-concurrent-sweep-start]
2015-05-26T16:23:08.485-0200: 65.588: [CMS-concurrent-sweep: 0.027/0.027 secs] [Times: user=0.03 sys=0.00, real=0.03 secs]
2015-05-26T16:23:08.485-0200: 65.589: [CMS-concurrent-reset-start]
2015-05-26T16:23:08.497-0200: 65.601: [CMS-concurrent-reset: 0.012/0.012 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]

[ducky-hong]

I could add all cms concurrent type to GcEvent.LogType. But, those are too many. How about remove the LogType enum and change it just string?

[xeoh]

It's fine. Let's make it as String.

[ducky-hong]

@JeOhLee
I tried to replace LogType to string type, but FULL_GC consists of Full Gc and ParNew - CMS which are not directly mapped to logs. I am considering to add raw_type which represents a raw log type. For example, ParNew CMS, Full GC, CMS-concurrent-{mark, preclean, abortable-preclean}, etc.

[ducky-hong]

I added type_detail field on GcEvent model. This field represents literally type details. For example, on concurrent mode exception case, type_detail field has a value Full GC (Allocation Failure); CMS (concurrent mode failure); Meatspace.

[xeoh]

LGTM

[dansuh17]

LGTM

[ducky-hong]

@densuh @JeOhLee
우리 마지막에 확인한 사람이 머지해주는건 어떨까요... 셀프머지하려니 눈물이... 😭