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

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Message-ID: <4bffd184-ff9e-7b9b-0322-e6359e3db71c@yandex-team.ru>
Date:   Mon, 28 Oct 2019 15:30:16 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
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 28/10/2019 15.22, Linus Torvalds wrote:
> 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?
> 

Sure. This change is trivial in comparison to his patchset.