linux-kernel - Re: [RFC PATCH] mm, oom: introduce vm.sacrifice_hugepage_on

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Message-ID: <YCzMVa5QSyUtlmnI@dhcp22.suse.cz>
Date:   Wed, 17 Feb 2021 08:57:09 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Eiichi Tsukata <eiichi.tsukata@...anix.com>, corbet@....net,
        mcgrof@...nel.org, keescook@...omium.org, yzaikin@...gle.com,
        akpm@...ux-foundation.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, felipe.franciosi@...anix.com
Subject: Re: [RFC PATCH] mm, oom: introduce vm.sacrifice_hugepage_on_oom

On Tue 16-02-21 14:30:15, Mike Kravetz wrote:
[...]
> However, this is an 'opt in' feature.  So, I would not expect anyone who
> carefully plans the size of their hugetlb pool to enable such a feature.
> If there is a use case where hugetlb pages are used in a non-essential
> application, this might be of use.

I would really like to hear about the specific usecase. Because it
smells more like a misconfiguration. What would be non-essential hugetlb
pages? This is not a resource to be pre-allocated just in case, right?

-- 
Michal Hocko
SUSE Labs