Can contigmalloc(9) fail even when M_NOWAIT is *not* specified?

[Andriy Gapon]

On 09/07/2018 09:21, Pratyush Yadav wrote:
> Hi,
> 
> The contigmalloc(9) man page says:
> 
>> The contigmalloc() function does not sleep waiting for memory resources
>> to be freed up, but instead actively reclaims pages before giving up.
>> However, unless M_NOWAIT is specified, it may select a page for reclama-
>> tion that must first be written to backing storage, causing it to sleep.
> 
> So if M_NOWAIT is *not* specified, can contigmalloc() "give up", and
> return NULL?

Yes.

-- 
Andriy Gapon