>> Right above vm_page_hold():
>> /*
>>  * Keep page from being freed by the page daemon
>>  * much of the same effect as wiring, except much lower
>>  * overhead and should be used only for *very* temporary
>>  * holding ("wiring").
>>  */
> What's the definition of "very temporary holding" ? What's the
> behavioural difference?

Long enough to complete a DMA operation versus the lifetime of  an
executing program.
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