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Ian Campbell 54a5077ca5 Correct CPU usage calculation in presence of offline CPUs and newer Linux

In https://github.com/torvalds/linux/commit/5ca3726 (released in v4.7-rc1) the
content of the `cpuacct.usage_percpu` file in sysfs was changed to include both
online and offline cpus. This broke the arithmetic in the stats helpers used by
`docker stats`, since it was using the length of the PerCPUUsage array as a
proxy for the number of online CPUs.

Add current number of online CPUs to types.StatsJSON and use it in the
calculation.

Keep a fallback to `len(v.CPUStats.CPUUsage.PercpuUsage)` so this code
continues to work when talking to an older daemon. An old client talking to a
new daemon will ignore the new field and behave as before.

Fixes #28941.

Signed-off-by: Ian Campbell <ian.campbell@docker.com>

2017-03-10 10:24:33 +00:00

command

Correct CPU usage calculation in presence of offline CPUs and newer Linux

2017-03-10 10:24:33 +00:00

compose

Merge pull request #31088 from xulike666/make-code-readable-again

2017-02-16 22:04:27 -05:00

config

Merge pull request #28213 from yongtang/11062016-service-ps-format

2017-02-17 10:23:18 -08:00

debug

Move debug functions to cli/debug package