linux-kernel - Re: Page Allocation Failure and Page allocation stalls

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Message-ID: <26e83e08-3249-e73f-2049-f36b44af8d8a@suse.cz>
Date:   Mon, 6 May 2019 11:05:26 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Pankaj Suryawanshi <pankajssuryawanshi@...il.com>,
        Valdis Klētnieks <valdis.kletnieks@...edu>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernelnewbies@...nelnewbies.org, Michal Hocko <mhocko@...nel.org>,
        minchan@...nel.org
Subject: Re: Page Allocation Failure and Page allocation stalls

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
>