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Don't read meminfo if there are no shrinkers #10

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modelrockettier commented Aug 24, 2018

If no shrinkers have been registered, there is no reason to read /proc/meminfo.

This allows some commands to run without needing the /proc filesystem to be mounted including format, show-super, unlock, --help, and version.

Since list_empty only does a simple pointer comparison, it seemed unnecessary to take the shrinker_lock.
(See urcu/list.h)

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