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

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Message-ID: <bfbb7523-c30d-7923-d64f-92b3608ddeba@alibaba-inc.com>
Date:   Mon, 02 Oct 2017 23:44:08 +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 9/30/17 11:43 PM, Christopher Lameter wrote:
> On Thu, 28 Sep 2017, Yang Shi wrote:
> 
>>> 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.
> 
> Ok I guess then those need to be moved out of CONFIG_SLABINFO. Otherwise
> dumping of slabs will not be supported when disabling that option.

Yes.

> 
> Or dump CONFIG_SLABINFO ..

I prefer to this. It sounds pointless to keep CONFIG_SLABINFO. It is 
always on by default and can't be changed in menuconfig.

Thanks,
Yang

>