From: Michal Hocko <mhocko@kernel.org>
To: Xishi Qiu <qiuxishi@huawei.com>
Cc: Xuzhichuang <xuzhichuang@huawei.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Songjiangtao (mygirlsjt)" <songjiangtao.song@huawei.com>,
"Zhangwei (FF)" <zw.zhang@huawei.com>
Subject: Re: [BUG REPORT] OOM Killer is invoked while the system still has much memory
Date: Tue, 14 Jul 2015 11:00:25 +0200 [thread overview]
Message-ID: <20150714090025.GA17660@dhcp22.suse.cz> (raw)
In-Reply-To: <55A4CB68.5060906@huawei.com>
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
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org>
To: Xishi Qiu <qiuxishi@huawei.com>
Cc: Xuzhichuang <xuzhichuang@huawei.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Songjiangtao (mygirlsjt)" <songjiangtao.song@huawei.com>,
"Zhangwei (FF)" <zw.zhang@huawei.com>
Subject: Re: [BUG REPORT] OOM Killer is invoked while the system still has much memory
Date: Tue, 14 Jul 2015 11:00:25 +0200 [thread overview]
Message-ID: <20150714090025.GA17660@dhcp22.suse.cz> (raw)
In-Reply-To: <55A4CB68.5060906@huawei.com>
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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next prev parent reply other threads:[~2015-07-14 9:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-14 7:11 [BUG REPORT] OOM Killer is invoked while the system still has much memory Xuzhichuang
2015-07-14 7:11 ` Xuzhichuang
2015-07-14 8:15 ` Michal Hocko
2015-07-14 8:15 ` Michal Hocko
2015-07-14 8:42 ` Xishi Qiu
2015-07-14 8:42 ` Xishi Qiu
2015-07-14 9:00 ` Michal Hocko [this message]
2015-07-14 9:00 ` Michal Hocko
2015-07-14 9:14 ` Xishi Qiu
2015-07-14 9:14 ` Xishi Qiu
2015-07-14 9:28 ` Michal Hocko
2015-07-14 9:28 ` Michal Hocko
2015-07-14 9:50 ` Xishi Qiu
2015-07-14 9:50 ` Xishi Qiu
2015-07-15 0:09 ` David Rientjes
2015-07-15 0:09 ` David Rientjes
2015-07-15 1:46 ` 答复: " Xuzhichuang
2015-07-15 1:46 ` Xuzhichuang
2015-07-15 1:57 ` David Rientjes
2015-07-15 1:57 ` David Rientjes
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