Commits on May 6, 2021

1. freezer: add delay after freeze …

   I hate to keep adding those kludges, but lately TestFreeze (and
   TestSystemdFreeze) from libcontainer/integration fails a lot. The
   failure comes and goes, and is probably this is caused by a slow host
   allocated for the test, and a slow VM on top of it.
   
   To remediate, add a small sleep on every 25th iteration in between
   asking the kernel to freeze and checking its status.
   
   In the worst case scenario (failure to freeze), this adds about 0.4 ms
   (40 x 10 us) to the duration of the call.
   
   It is hard to measure how this affects CI as GHA plays a roulette when
   allocating a node to run the test on, but it seems to help. With
   additional debug info, I saw somewhat frequent "frozen after 24 retries"
   or "frozen after 49 retries", meaning it succeeded right after the added
   sleep.
   
   While at it, rewrite/improve the comments.
   
   Signed-off-by: Kir Kolyshkin <[email protected]>

   

   kolyshkin committed May 6, 2021
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