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Date: Tue, 28 Apr 2015 11:38:35 -0700
Message-ID: <CA+55aFyajquhGhw59qNWKGK4dBV0TPmDD7-1XqPo7DZWvO_hPg@mail.gmail.com>
Subject: Re: Should mmap MAP_LOCKED fail if mm_poppulate fails?
From: Linus Torvalds <torvalds@linux-foundation.org>
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Sender: owner-linux-mm@kvack.org
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To: Michal Hocko <mhocko@suse.cz>
Cc: linux-mm <linux-mm@kvack.org>, Cyril Hrubis <chrubis@suse.cz>, Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com>, Michel Lespinasse <walken@google.com>, Rik van Riel <riel@redhat.com>, Michael Kerrisk <mtk.manpages@gmail.com>, LKML <linux-kernel@vger.kernel.org>, Linux API <linux-api@vger.kernel.org>

On Tue, Apr 28, 2015 at 11:35 AM, Michal Hocko <mhocko@suse.cz> wrote:
>
> I am still not sure I see the problem here.

Basically, I absolutely hate the notion of us doing something
unsynchronized, when I can see us undoing a mmap that another thread
is doing. It's wrong.

You also didn't react to all the *other* things that were wrong in
that patch-set. The games you play with !fatal_signal_pending() etc
are just crazy.

End result: I absolutely detest the whole thing. I told you what I
consider an acceptable solution instead, that is much simpler and
doesn't have any of the problems of your patchset.

                      Linus

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