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vm_page_wire_mapped: explain why failure does not affect correctness.

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Reviewed by:	markj (previous version)
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D22196
This commit is contained in:
kib 2019-10-30 17:33:17 +00:00
parent adeaebe505
commit f07bc81865
1 changed files with 3 additions and 0 deletions
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3
sys/vm/vm_page.c
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@ -3763,6 +3763,9 @@ vm_page_wire(vm_page_t m)
/*
* Attempt to wire a mapped page following a pmap lookup of that page.
* This may fail if a thread is concurrently tearing down mappings of the page.
* The transient failure is acceptable because it translates to the
* failure of the caller pmap_extract_and_hold(), which should be then
* followed by the vm_fault() fallback, see e.g. vm_fault_quick_hold_pages().
*/
bool
vm_page_wire_mapped(vm_page_t m)