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swap_pager: small improvement to find_least
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Authored by dougm on Tue, Jun 11, 7:38 AM.
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Summary

This change drops an unneeded test, a branch and avoids a needless computation. Altogether, it saves 10 bytes of instructions on amd64.

It will mean that, on the path to MPASS(0), the same lookup and iteration will happen twice.

Test Plan

The kernel still boots.

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rG FreeBSD src repository
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Event Timeline

dougm requested review of this revision.Tue, Jun 11, 7:38 AM
dougm created this revision.
kib added inline comments.
sys/vm/swap_pager.c
2279
2312

Perhaps it is the time to change these two lines into __unreachable().

This revision is now accepted and ready to land.Tue, Jun 11, 2:39 PM
This revision was automatically updated to reflect the committed changes.