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A comment on A fun optimization trick from rsync. Parent comment

Re:A fun optimization trick from rsync by eridius on Monday October 29, 2018 @03:29AM (#18325609)
According to the article, a step isn't skipped because it had a transient failure, it's skipped because it returns a special error code ENOSYS that means the syscall hasn't even been implemented, and therefore there's no point in ever trying it again.
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Re:A fun optimization trick from rsync by carlmr on Monday October 29, 2018 @07:31AM (#18326583)
That's correct. Although it's a very specific use-case.
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Re:A fun optimization trick from rsync by scatters on Monday October 29, 2018 @08:51AM (#18327055)
AIUI with containers it's now entirely possible that a running program may be migrated from a host where a syscall has not been implemented to one where it has.
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