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Message-ID: <CACDBo56LBKsxqsHAi=Jd6ZJoZsSpFJ5a_DbwEx9h+=FJjr0rhw@mail.gmail.com> Date: Thu, 9 May 2019 22:17:14 +0530 From: Pankaj Suryawanshi <pankajssuryawanshi@...il.com> To: Vlastimil Babka <vbabka@...e.cz> Cc: Valdis Klētnieks <valdis.kletnieks@...edu>, 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 Mon, May 6, 2019 at 2:35 PM Vlastimil Babka <vbabka@...e.cz> wrote: > > 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? > I know cma uses alloc_contig_range() but using dma api it will uses many functions. the failure is coming from dma_common_contiguous_remap() for kmalloc , and which is called by dma_alloc_attr for cma allocation. Please let me know, how to avoid page allocation stalls. any reason ? Cpu Utilization issue ? or I am running out of memory ? My System configuration is 2GB RAM Memory Spilt 2G/2G vmalloc=1024M CMA=1024 Max contiguous memory required 390M > > Please let me know how to overcome this issues, or how to reduce > > fragmentation of memory so that higher order allocation get suuceed ? > > > > Thanks > > >
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