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Date:   Wed, 29 May 2019 23:44:53 -0700
From:   Chris Down <>
To:     Michal Hocko <>
Cc:     Andrew Morton <>,
        Johannes Weiner <>,
        Tejun Heo <>, Roman Gushchin <>,
        Dennis Zhou <>,,,,
Subject: Re: [PATCH REBASED] mm, memcg: Make scan aggression always exclude

Michal Hocko writes:
>Maybe I am missing something so correct me if I am wrong but the new
>calculation actually means that we always allow to scan even min
>protected memcgs right?

We check if the memcg is min protected as a precondition for coming into this 
function at all, so this generally isn't possible. See the mem_cgroup_protected 
MEMCG_PROT_MIN check in shrink_node.

(Of course, it's possible we race with going within protection thresholds 
again, but this patch doesn't make that any better or worse than the previous 

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