It examines the blkio device tree and sums data as far as i know.
Removed devices do not get deleted from the blkio statistics tree and
are just marked as offline somehow.
In our case racadm lclog created and destroyed usb devices to pull data
and the blkio tree reached over 65000 leafs. It takes
the hardware does not seem to be relevant. Do you have anything calling
"racadm lclog" on fairly regular basis? it creates and destroys a usb
device over and over.
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Do you have a lot of blkio devices coming and going? For example
iscsi/usb/etc. We currently believe it's tree bloat due to added/removed
devices. We are still digging into the issue.
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yes. just confirms it takes a while.
** Attachment added: "flame2.html"
https://bugs.launchpad.net/ubuntu/+source/linux-meta/+bug/2021571/+attachment/5700645/+files/flame2.html
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Was the cause of this ever determined? I am seeing something similar on
some of my systems. Times are usually around 1s, sometimes slightly
higher.
# uname -r
4.15.0-193-generic
# time cat /sys/fs/cgroup/blkio/blkio.time_recursive
8:144 69349171178307
8:128 4718621058
8:112 4604996397
8:96
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