linux-kernel - Re: [PATCH 0/2 v4] oom: capture unreclaimable slab info in oom message when kernel panic

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Message-ID: <20170926075638.l7xoaismqsnp4qsw@dhcp22.suse.cz>
Date:   Tue, 26 Sep 2017 09:56:38 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Yang Shi <yang.s@...baba-inc.com>
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2 v4] oom: capture unreclaimable slab info in oom
 message when kernel panic

On Tue 26-09-17 05:52:50, Yang Shi wrote:
> Maybe we can set a unreclaimable slab/total mem ratio. For example, when
> unreclaimable slab size >= 50% total memory size, then we print out slab
> stats in oom? And, the ratio might be adjustable in /proc.

This sounds quite reasonable to me. I would compare the slab amount to
the directly user backed memory (LRU ages) though.

-- 
Michal Hocko
SUSE Labs