linux-kernel - Re: [External] Re: [RFC 0/2] riscv: Idle thread using Zawrs extension

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Date: Thu, 18 Apr 2024 15:08:24 +0100
From: Conor Dooley <conor@...nel.org>
To: Xu Lu <luxu.kernel@...edance.com>
Cc: Christoph Müllner <christoph.muellner@...ll.eu>,
	Andrew Jones <ajones@...tanamicro.com>, paul.walmsley@...ive.com,
	palmer@...belt.com, aou@...s.berkeley.edu, andy.chiu@...ive.com,
	guoren@...nel.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, lihangjing@...edance.com,
	dengliang.1214@...edance.com, xieyongji@...edance.com,
	chaiwen.cc@...edance.com, Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [External] Re: [RFC 0/2] riscv: Idle thread using Zawrs extension

On Thu, Apr 18, 2024 at 09:09:06PM +0800, Xu Lu wrote:
> On Thu, Apr 18, 2024 at 8:56 PM Christoph Müllner
> <christoph.muellner@...ll.eu> wrote:
> >
> > On Thu, Apr 18, 2024 at 2:44 PM Xu Lu <luxu.kernel@...edance.com> wrote:
> > >
> > > On Thu, Apr 18, 2024 at 8:26 PM Christoph Müllner
> > > <christoph.muellner@...ll.eu> wrote:
> > > >
> > > > On Thu, Apr 18, 2024 at 1:50 PM Xu Lu <luxu.kernel@...edance.com> wrote:
> > > > >
> > > > > This patch series introduces a new implementation of idle thread using
> > > > > Zawrs extension.
> > > >
> > > > This overlaps with the following series:
> > > >   https://lore.kernel.org/all/20240315134009.580167-7-ajones@ventanamicro.com/
> > >
> > > Hi Christoph.
> > > Thanks for your reply!
> > > Actually our patch series is different from this. The work from your
> > > link focuses on providing support for Zawrs and implementing spinlock
> > > using it, while our work focuses on implementing idle thread using
> > > Zawrs and accelerating IPI to idle cpu. Of course, the ISA ZAWRS
> > > config part can be merged. We will refine our code in the next version
> > > to reduce code conflicts.
> >
> > Yes, I've seen that this targets another optimization, but the basic
> > Zawrs support
> > would be identical to the other patchset (even if it is not).
> > I would propose that we work on a basic Zawrs support patchset that introduces
> > the Kconfig, DTS and hwprobe parts (a subset of Andrew's patchset).
> > Once this is merged, all other optimizations can be built upon it
> > (spinlocks, idle thread, glibc CPU spinning).
> > If this proposal is fine for the maintainers/reviewers, then Andrew could resend
> > these basic-support patches.
> >
> > BR
> > Christoph
> 
> Roger that! This does make more sense. We will rebase our code on
> Andrew's basic support patches in the next version.

IIRC Drew's working on a new version of the linked series (we were
talking about it yesterday) so hold off for that before doing a rebase
and sending a new version I think.

Thanks,
Conor.

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