linux-kernel - Re: [PATCH 2/3] mm: oom: show unreclaimable slab info when kernel panic

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Message-ID: <b023b5f4-84b5-1686-7b15-c9a3a439b8be@alibaba-inc.com>
Date:   Thu, 28 Sep 2017 06:11:46 +0800
From:   "Yang Shi" <yang.s@...baba-inc.com>
To:     Christopher Lameter <cl@...ux.com>
Cc:     Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        akpm@...ux-foundation.org, mhocko@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] mm: oom: show unreclaimable slab info when kernel
 panic



On 9/27/17 2:59 PM, Christopher Lameter wrote:
> On Thu, 28 Sep 2017, Yang Shi wrote:
>>> CONFIG_SLABINFO? How does this relate to the oom info? /proc/slabinfo
>>> support is optional. Oom info could be included even if CONFIG_SLABINFO
>>> goes away. Remove the #ifdef?
>>
>> Because we want to dump the unreclaimable slab info in oom info.
> 
> CONFIG_SLABINFO and /proc/slabinfo have nothing to do with the
> unreclaimable slab info.

The current design uses "struct slabinfo" and get_slabinfo() to retrieve 
some info, i.e. active objs, etc. They are protected by CONFIG_SLABINFO.

We could replicate the logic in get_slabinfo without using struct 
slabinfo, but it sounds not that necessary and CONFIG_SLABINFO is 
typically enabled by default and it is not shown in menuconfig.

Thanks,
Yang

>