On 2015/7/14 17:00, Michal Hocko wrote: > 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. > I know, some of them are from reserved memory(MIGRATE_RESERVE), right? Thanks, Xishi Qiu -- 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>