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References: <20170908223934.67442-1-sherryy@android.com> <20170913215932.86846-1-sherryy@android.com>
 <20170913150904.90a37a966a04ea394a2c3d9b@linux-foundation.org>
From: Sherry Yang <sherryy@android.com>
Date: Wed, 13 Sep 2017 18:44:11 -0400
Message-ID: <CAOUJ4O+NpiwTNeALOoH19DoBwv-HG3HvetrhuXY9weLXuo3bkQ@mail.gmail.com>
Subject: Re: [PATCH] mm: Restore mmput_async
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Todd Kjos <tkjos@google.com>,
        Martijn Coenen <maco@google.com>,
        =?UTF-8?B?QXJ2ZSBIasO4bm5ldsOlZw==?= <arve@android.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Ingo Molnar <mingo@kernel.org>, Michal Hocko <mhocko@suse.com>,
        Vlastimil Babka <vbabka@suse.cz>, David Rientjes <rientjes@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andy Lutomirski <luto@kernel.org>, Oleg Nesterov <oleg@redhat.com>,
        Hoeun Ryu <hoeun.ryu@gmail.com>, Christoph Lameter <cl@linux.com>,
        Vegard Nossum <vegard.nossum@oracle.com>,
        Frederic Weisbecker <fweisbec@gmail.com>
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The patch that uses mmput_async() is
https://lkml.org/lkml/2017/9/8/785. Gmail doesn't seem to respect
in-reply-to.

On Wed, Sep 13, 2017 at 6:09 PM, Andrew Morton
<akpm@linux-foundation.org> wrote:
> On Wed, 13 Sep 2017 17:59:27 -0400 Sherry Yang <sherryy@android.com> wrote:
>
>> Restore asynchronous mmput, allowing mmput_async to be called
>> from an atomic context in Android binder shrinker callback.
>>
>> mmput_async was initially introduced in ec8d7c14e
>> ("mm, oom_reaper: do not mmput synchronously from the
>> oom reaper context"), and was removed in 212925802
>> ("mm: oom: let oom_reap_task and exit_mmap run concurrently")
>
> Presumably there's a patch somewhere which adds a call to mmput_async()
> into drivers/android/binder.c?  Where is that patch?