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Differential D45558

swap_pager: small improvement to find_least
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Authored by dougm on Jun 11 2024, 7:38 AM.
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kib
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rGdd0e5c02ab13: swap_pager: small improvement to find_least
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.Jun 11 2024, 7:38 AM
dougm created this revision.
kib accepted this revision.Jun 11 2024, 2:39 PM
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.Jun 11 2024, 2:39 PM
Closed by commit rGdd0e5c02ab13: swap_pager: small improvement to find_least (authored by dougm). · Explain WhyJun 11 2024, 4:39 PM
This revision was automatically updated to reflect the committed changes.
dougm added a commit: rGdd0e5c02ab13: swap_pager: small improvement to find_least.
Herald added a subscriber: imp. · View Herald TranscriptJun 11 2024, 4:39 PM
dougm added a reverting change: rG28af3eb62b73: Revert "swap_pager: small improvement to find_least".Jun 16 2024, 3:39 PM

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sys/
vm/
19 lines

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sys/vm/swap_pager.c

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