linux-kernel - Re: [PATCH net-next 0/4] mm,tcp: provide mmap

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Message-ID: <20180421090722.GA11998@infradead.org>
Date:   Sat, 21 Apr 2018 02:07:22 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH net-next 0/4] mm,tcp: provide mmap_hook to solve lockdep
 issue

On Fri, Apr 20, 2018 at 08:55:38AM -0700, Eric Dumazet wrote:
> This patch series provide a new mmap_hook to fs willing to grab
> a mutex before mm->mmap_sem is taken, to ensure lockdep sanity.
> 
> This hook allows us to shorten tcp_mmap() execution time (while mmap_sem
> is held), and improve multi-threading scalability. 

Missing CC to linu-fsdevel and linux-mm that will have to decide.

We've rejected this approach multiple times before, so you better
make a really good argument for it.

introducing a multiplexer that overloads a single method certainly
doesn't help making that case.