Re: [BUG REPORT] OOM Killer is invoked while the system still has much memory

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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

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