[Bugs] [Bug 1335373] cyclic dentry loop in inode table

bugzilla at redhat.com bugzilla at redhat.com
Sat May 11 02:37:01 UTC 2019


https://bugzilla.redhat.com/show_bug.cgi?id=1335373



--- Comment #8 from Raghavendra G <rgowdapp at redhat.com> ---
Another data point for this bug is cyclic dentry loops can cause *serious*
performance regression in lookup codepath. Especially if cyclic loops are
formed relatively deep in directory hierarchy as they increase the dentry
search time exponentially (2 pow number-of-duplicate-dentries). So, this bug is
correctness as well as a performance one.

And I've seen the issue in one of production environments (though we couldn't
exactly measure perf impact of this in this setup, but perf impact was seen in
test setups) - https://bugzilla.redhat.com/show_bug.cgi?id=1696353#c11

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