On Tue 14-07-15 16:42:16, Xishi Qiu wrote: > On 2015/7/14 16:15, Michal Hocko wrote: > > > On Tue 14-07-15 07:11:34, Xuzhichuang wrote: [...] > >> Jul 10 12:33:03 BMS_CNA04 kernel: [18136514.138968] DMA32: 188513*4kB 29459*8kB 2*16kB 2*32kB 1*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 990396kB > > > > Moreover your allocation request was oreder 2 and you do not have much > > memory there because most of the free memory is in order-0-2. > > > > Hi Michal, > > order=2 -> alloc 16kb memory, and DMA32 still has 2*16kB 2*32kB 1*64kB 1*512kB, > so you mean this large buddy block was reclaimed during the moment of oom and > print, right? Not really. Those high order blocks are inaccessible for your GFP_KERNEL allocation. See __zone_watermark_ok. -- Michal Hocko SUSE Labs -- 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>