CMS: "premature" minor GCs w/ ParNew

[Vladimir Ivanov]

Hi,

I see minor GCs occurring when young gen occupancy is very low, e.g.:
[ParNew: 8446K->7381K(943744K), 0.0274200 secs]

Does anybody know what provokes such "premature" GCs?

There's no CMS concurrent cycle running or any other interesting GC 
events occurred around that moment - just a sequence of minor GCs with 
such outlier.

Such premature minor GCs occur on a regular basis.

JDK version: 6u37, 64-Bit Server VM (20.12-b01, mixed mode)

Best regards,
Vladimir Ivanov