On Mon, May 6, 2019 at 2:35 PM Vlastimil Babka <vbabka@xxxxxxx> 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 > > >
