cgroupv1 freezer: thaw to increase freeze chances #2791
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It appears that briefly thawing the cgroup while freezing greatly increases its chances to freeze successfully. The test case I used is doing runc exec in a look parallel with runc pause/resume in another loop, and the failure to freeze rate reduced from 40 to 0 per minute (tested inside a VM using a busybox container running sleep 1h, doing about 1500 pause/resumes and 650 execs per minute), with max retries being 150 (of 1000). This is still a game of chances, so failures are possible. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
dqminh
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Feb 5, 2021
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This is an alternative to #2785 and a continuation of #2774, addressing #2753
It appears that briefly thawing the cgroup while freezing
greatly increases its chances to freeze successfully.
The test case I used is doing runc exec in a look parallel with runc
pause/resume in another loop, and the failure to freeze rate reduced
from 40 to 0 per minute (tested inside a VM using a busybox container
running sleep 1h, doing about 1500 pause/resumes and 650 execs per
minute), with max retries being 150 (of 1000).
This is still a game of chances, so failures are possible.
Thanks to @Vanient for idea and initial implementation.
Closes: #2785