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List:       linux-kernel
Subject:    Re: user-space concurrent pipe buffer scheduler interactions
From:       Linus Torvalds <torvalds () linux-foundation ! org>
Date:       2024-04-03 20:57:11
Message-ID: CAHk-=wiOqTAX7nwQqHJ2Ti3dbxM-HrUJq3FD_Gjua5qW=QAoTg () mail ! gmail ! com
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On Wed, 3 Apr 2024 at 13:52, Michael Clark <michael@metaparadigm.com> wrote:
>
> On 4/4/24 05:56, Linus Torvalds wrote:
> > On Tue, 2 Apr 2024 at 13:54, Michael Clark <michael@metaparadigm.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.
>
> We can work on this.

It's been tried.

Nobody ever found a use-case that is sufficiently convincing, but see
the write-up at

   https://lwn.net/Articles/944895/

for a pointer to at least attempts.

               Linus

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