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

From	Xishi Qiu <qiuxishi@huawei.com>
Newsgroups	linux.kernel
Subject	Re: [BUG REPORT] OOM Killer is invoked while the system still has much memory
Date	2015-07-14 11:20 +0200
Message-ID	<pM4xA-lo-19@gated-at.bofh.it> (permalink)
References	<pM2Fr-7F7-7@gated-at.bofh.it> <pM3Bw-8dT-7@gated-at.bofh.it> <pM44y-8nD-11@gated-at.bofh.it> <pM4nU-hK-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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

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Thread

Re: [BUG REPORT] OOM Killer is invoked while the system still has  much memory Michal Hocko <mhocko@kernel.org> - 2015-07-14 10:20 +0200
  Re: [BUG REPORT] OOM Killer is invoked while the system still has  much memory Xishi Qiu <qiuxishi@huawei.com> - 2015-07-14 10:50 +0200
    Re: [BUG REPORT] OOM Killer is invoked while the system still has  much memory Michal Hocko <mhocko@kernel.org> - 2015-07-14 11:10 +0200
      Re: [BUG REPORT] OOM Killer is invoked while the system still has  much memory Xishi Qiu <qiuxishi@huawei.com> - 2015-07-14 11:20 +0200
        Re: [BUG REPORT] OOM Killer is invoked while the system still has  much memory Michal Hocko <mhocko@kernel.org> - 2015-07-14 11:30 +0200
          Re: [BUG REPORT] OOM Killer is invoked while the system still has  much memory Xishi Qiu <qiuxishi@huawei.com> - 2015-07-14 12:00 +0200

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