Page Allocation Failure and Page allocation stalls

[Vlastimil Babka]

On 5/3/19 7:44 PM, Pankaj Suryawanshi wrote:
>> First possibility that comes to mind is that a usermodehelper got launched, and
>> it then tried to fork with a very large active process image.  Do we have any
>> clues what was going on?  Did a device get hotplugged?
> 
> Yes,The system is android and it tries to allocate memory for video
> player from CMA reserved memory using custom octl call for dma apis.

The stacktrace doesn't look like a CMA allocation though. That would be
doing alloc_contig_range(), not kmalloc(). Could be some CMA area setup
issue?

> Please let me know how to overcome this issues, or how to reduce
> fragmentation of memory so that higher order allocation get suuceed ?
> 
> Thanks
>