linux-kernel - Re: [PATCH] task_work: remove fifo ordering guarantee

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Message-ID: <CA+55aFwf5DAx=t38N=L-5_HZu=2b3PEBPtumDPoovYDPNzMQOQ@mail.gmail.com>
Date:	Sat, 5 Sep 2015 13:46:00 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Maciej Żenczykowski <maze@...gle.com>
Subject: Re: [PATCH] task_work: remove fifo ordering guarantee

On Fri, Sep 4, 2015 at 10:42 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> OK, having found the beginning of the thread, I understand what is being
> attempted, but... why the hell bother with FIFO in the first place?  AFAICS,
> task_work_add() uses in VFS (final fput() and final mntput() alike)
> do not care about the FIFO at all.
>
> Sure, some out-of-tree mer^H^Hodule might rely on that.  So what?
>
> IMO, unless we have a good in-tree reason for insisting on FIFO, dropping it
> is the most obvious solution...

I agree. We should just try that.

I'll apply Eric's patch from the beginning of this tree, and let's
just see if anybody ever notices.

Removing code and possibly fixing a latency issue sounds like a win-win.

              Linus
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