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Differential D11791

Batch v_wire_count decrements in vm_hold_free_pages().
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Authored by markj on Jul 31 2017, 1:43 AM.
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alc
kib
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rS321805: Batch v_wire_count decrements in vm_hold_free_pages().
Summary

Atomic updates to v_wire_count are a significant source of contention.

Also remove an old printf in the case where one of the pages is in the
shared-busied state; vm_page_free_toq() will panic in this case anyway.

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Buildable 10760
Build 11155: arc lint + arc unit

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sys/
kern/
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Diff 31365

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sys/kern/vfs_bio.c

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