linux-kernel - Re: [PATCH v3] mm: fix tick timer stall during deferred page init

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Message-ID: <CA+CK2bCKxok9Ho2NJd0kWR=YCi+eQqyfv6fg1Je3Lmov9PqzwQ@mail.gmail.com>
Date:   Wed, 1 Apr 2020 12:51:56 -0400
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Daniel Jordan <daniel.m.jordan@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Hildenbrand <david@...hat.com>,
        Shile Zhang <shile.zhang@...ux.alibaba.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] mm: fix tick timer stall during deferred page init

> > I do not remember seeing any real failures, this was a theoretical
> > window. So, we could potentially simply remove these locks until we
> > see a real boot failure in some interrupt thread. The allocation has
> > to be rather large as well.
>
> Yes please! We are really great at over complicating and over
> engineering stuff based on theoretical issues and build on top of that
> and make the code even more complex because nobody dares to re-evaluate
> and so on.

I will submit a patch (or revert) whichever is cleaner.

Pasha