softreference, 0 refs report high cost time

[王顺云]

Hi Forks,

I have an application that reported high (more than 1 second) times to
process *zero* SoftReferences, for example:

2020-08-11T18:58:19.222+0800: 611331.604: [SoftReference, 0 refs, 1.4741673
secs]2020-08-11T18:58:20.696+0800: 611333.079: [WeakReference, 0 refs,
0.0004746 secs]2020-08-11T18:58:20.696+0800: 611333.079: [FinalReference,
4559 refs, 0.0019431 secs]2020-08-11T18:58:20.698+0800: 611333.081:
[PhantomReference, 2 refs, 0 refs, 0.0016303
secs]2020-08-11T18:58:20.700+0800: 611333.083: [JNI Weak Reference,
0.0000284 secs], 1.4867549 secs]

2020-08-14T02:58:22.222+0800: 812934.605: [SoftReference, 0 refs, 1.0247147
secs]2020-08-14T02:58:23.247+0800: 812935.629: [WeakReference, 1 refs,
0.0007859 secs]2020-08-14T02:58:23.247+0800: 812935.630: [FinalReference,
4382 refs, 0.0024934 secs]2020-08-14T02:58:23.250+0800: 812935.633:
[PhantomReference, 2 refs, 0 refs, 0.0008613
secs]2020-08-14T02:58:23.251+0800: 812935.634: [JNI Weak Reference,
0.0000239 secs], 1.0380333 secs]

We have been hit by this anomaly a few times now, and  detailed information
can be find in the attached logs (that also show the command line flags).

OS information: Linux 3.10.0-862.el7.x86_64 x86_64
NAME="CentOS Linux"
VERSION="7 (Core)"

Docker version:
18.09.9

Thanks for the help.

Tony
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