docker stats: add blkio rate and blkio IOPS

[zhangyong-huawei]

replaces #20741

blkio rate and IOPS is calculated by introducing PreBlkioStats and PreRead in
types.Stats, thus we can get the rate/IOPS by (BlkioStats - PreBlkioStats)/(Read - PreRead)

Now with the patch docker stats shows like below:

    $ docker stats
    CONTAINER           CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BIO(Bytes)          BIO(Rate)           BIO(IOPS)
    1285939c1fd3        0.07%               796 KB / 64 MB        1.21%               788 B / 648 B       3.568 MB / 512 KB   0 B / 0 B           0.00 / 0.00
    9c76f7834ae2        0.07%               2.746 MB / 64 MB      4.29%               1.266 KB / 648 B    12.4 MB / 0 B       0 B / 0 B           0.00 / 0.00
    d1ea048f04e4        0.03%               4.583 MB / 64 MB      6.30%               2.854 KB / 648 B    27.7 MB / 0 B       0 B / 0 B           0.00 / 0.00

Signed-off-by: Zhang Yong zhangyong23@huawei.com

[zhangyong-huawei]

@thaJeztah code is rebased again.

[thaJeztah]

Flaky test on win2lin? https://jenkins.dockerproject.org/job/Docker-PRs-Win2Lin/22938/console

12:40:04 PASS: docker_cli_run_test.go:3925: DockerSuite.TestRunNonExecutableCmd 1.010s
12:40:07 
12:40:07 ----------------------------------------------------------------------
12:40:07 FAIL: docker_cli_run_test.go:3936: DockerSuite.TestRunNonExistingCmd
12:40:07 
12:40:07 docker_cli_run_test.go:3942:
12:40:07     c.Fatalf("Run non-existing command should have errored with exit code 127, but we got exit: %d, State.ExitCode: %s", exit, stateExitCode)
12:40:07 ... Error: Run non-existing command should have errored with exit code 127, but we got exit: 125, State.ExitCode: -1 Cannot start container 9feabe3cb5e0c52a83484f8a7a277d284d8de214968c3b3ad84884ad7d579b51: [10] System error: invalid character 'b' looking for beginning of value
12:40:08 ----------------------------------------------------------------------

edit: yes, flaky test: #20462

[thaJeztah]

ping @cpuguy83 this is a replacement for / rebase of #20741

[calavera]

if we ever want to support stats on Windows, I don't think we should add more linux specific fields for now. But I'll leave it to other maintainers.

[zhangyong-huawei]

Maybe at that time we could have a --format flag on stats. Thus we could provide default
stats format for both linux and windows.

On 2016/3/11 8:14, David Calavera wrote:

if we ever want to support stats on Windows, I don't think we should add more fields to the stats for now. But I'll leave it to other maintainers.

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Reply to this email directly or view it on GitHub #21026 (comment).

[coolljt0725]

IMO, this PR only add a linux specific filed PreBlkioStats, but we already have BlkioStats , so it should not become more complicated to support stats on Windows by adding PreBlkioStats :)

[cpuguy83]

I think is fine with a format flag. New fields don't need to be enabled by default.

[thaJeztah]

I'm going to close this PR, we prefer to have a format flag first, and then reconsider adding more columns

[thaJeztah]

ping @zhangyong-huawei a --format flag is now added to docker stats; let us know if you want to work on this again (see #24987)

[zhangyong-huawei]

Yeah，I’ll rebase my work on –format flag. Thanks for your kind remind.

发件人: Sebastiaan van Stijn [mailto:notifications@github.com]
发送时间: 2016年11月1日 0:59
收件人: docker/docker docker@noreply.github.com
抄送: Zhangyong (Euler) zhangyong23@huawei.com; Mention mention@noreply.github.com
主题: Re: [docker/docker] docker stats: add blkio rate and blkio IOPS (#21026)

ping @zhangyong-huaweihttps://github.com/zhangyong-huawei a --format flag is now added to docker stats; let us know if you want to work on this again (see #24987#24987)

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