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This bug was initially created as a copy of Bug #1957621

I am copying this bug because: 

also applies to RHEL8.

Description of problem:

Please backport PR https://github.com/dracutdevs/dracut/pull/1450
A customer faces kernel update slowness (more than 20 minutes) due to having tons of multipath devices hosting oracleasm file systems.

The PR above, accepted by Upstream today, implement a basic cache for get_maj_min(), which is really necessary on large systems.


Version-Release number of selected component (if applicable):

RHEL7 and RHEL8 dracut


How reproducible:

Always, see reproducer in Upstream PR

Verified on dracut-049-188.git20210802.el8.x86_64

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (dracut bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4394