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Differential D12888

Remove object_collapses and object_bypasses counters
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Authored by mjg on Nov 1 2017, 8:15 AM.
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alc
markj
kib
Summary

Spotted during crusade to reduce false-sharing. If someone wants to change them into less unfriendly counters or whatever I'm happy to drop this diff.

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rS FreeBSD src repository - subversion
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Buildable 12355

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mjg created this revision.Nov 1 2017, 8:15 AM
Herald added a subscriber: imp. · View Herald TranscriptNov 1 2017, 8:15 AM
alc added a comment.Nov 2 2017, 5:08 PM

On a occasion, I do look at these counters. Converting them to an SMP-friendly alternative is probably a worthwhile endeavor.

kib added a comment.Nov 3 2017, 11:05 AM
In D12888#268165, @alc wrote:

On a occasion, I do look at these counters. Converting them to an SMP-friendly alternative is probably a worthwhile endeavor.

This is very similar to what I said to Mateusz in the private discussion. In particular, the counters were the key clues in the investigation of bugs fixed by https://www.freebsd.org/security/advisories/FreeBSD-EN-16:17.vm.asc

alc added a comment.Dec 24 2017, 9:41 PM

See D13611.

alc added a comment.Dec 26 2017, 8:07 PM

Can we abandon this change now?

mjg abandoned this revision.Dec 27 2017, 9:32 PM

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sys/
vm/
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sys/vm/vm_object.c

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