On 02/05/2018 12:58 AM, Alexey Skidanov wrote: > Hello, > > On x86 machine with 16GB RAM installed, I reserved 1 GB area for CMA: > [ 0.000000] cma: Reserved 1024 MiB at 0x00000003fcc00000 > > Some time after the boot, CMa failed to allocate chunk of memory while > there are enough contiguous pages: > > [ 392.132392] cma: cma_alloc: alloc failed, req-size: 200000 pages, > ret: -16 > [ 392.132393] cma: number of available pages: > 6@8314+9@8343+9@8375+253648@8496=> 253672 free of 262144 total pages > [ 392.132398] cma: cma_alloc(): returned (null) > > What are the possible reasons for such failure (besides the pinned user > allocated pages) ? > > Thanks, > Alexey > After some debugging - the page migration failed because of there is the page with _refcount 2, _mapcount -1. Seems like it's pinned? Thanks, Alexey -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
