linux-kernel - Re: user-space concurrent pipe buffer scheduler interactions

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Message-ID: <CAHk-=wj3khqjXnHmShPj+tZvC=SyUitTZ7BkDO-rqu_aCVPrXA@mail.gmail.com>
Date: Wed, 3 Apr 2024 09:56:27 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Michael Clark <michael@...aparadigm.com>
Cc: Jens Axboe <axboe@...nel.dk>, Ingo Molnar <mingo@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: user-space concurrent pipe buffer scheduler interactions

On Tue, 2 Apr 2024 at 13:54, Michael Clark <michael@...aparadigm.com> wrote:
>
> I am working on a low latency cross-platform concurrent pipe buffer
> using C11 threads and atomics.

You will never get good performance doing spinlocks in user space
unless you actually tell the scheduler about the spinlocks, and have
some way to actually sleep on contention.

Which I don't see you as having.

               Linus