linux-kernel - Re: [PATCH] pipe: wakeup writer only if pipe buffer is at least half empty

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Message-ID: <CAHk-=wjtLz=S00b0T+_Zrx0bfQ1QDLpWAq7eo=w0FPi5N_UqOA@mail.gmail.com>
Date:   Mon, 28 Oct 2019 13:22:14 +0100
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:     David Howells <dhowells@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pipe: wakeup writer only if pipe buffer is at least half empty

On Mon, Oct 28, 2019 at 10:09 AM Konstantin Khlebnikov
<khlebnikov@...dex-team.ru> wrote:
>
> Ok. This breakage scenario is doubtful but such weird software really might exist.
>
> What about making this thing tunable via fcntl like size of pipe buffer?

Let's see if we can do it without a tunable and maybe nobody notices?

But I'd like you to do it on top of David's pipe patches, so that we
don't have unnecessary churn and conflicts next merge window in this
area. Ok?

              Linus