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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
