linux-kernel - Re: [PATCH v4] percpu_counter: add a cmpxchg-based _add

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Message-ID: <ZlZntVycT45knbwB@snowbird>
Date: Tue, 28 May 2024 16:24:37 -0700
From: Dennis Zhou <dennis@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mateusz Guzik <mjguzik@...il.com>, tj@...nel.org, hughd@...gle.com,
	vbabka@...e.cz, linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4] percpu_counter: add a cmpxchg-based _add_batch variant

Hi Andrew,

On Tue, May 28, 2024 at 02:19:29PM -0700, Andrew Morton wrote:
> On Tue, 28 May 2024 13:56:58 -0700 Dennis Zhou <dennis@...nel.org> wrote:
> 
> > >  EXPORT_SYMBOL(percpu_counter_add_batch);
> > >  
> > >  /*
> > > -- 
> > > 2.39.2
> > > 
> > 
> > Andrew you picked up the __this_cpu_try_cmpxchg() patches. At this point
> > you might as well pick up this too. The cpumask clean ups are likely
> > going to give me trouble later this week when I rebase so I'll probably
> > have to base my percpuh hotplug branch on your mm-unstable now.
> 
> Well, if it makes more sense to carry these in a different tree, let's
> do that.

Regarding percpu, I've generally care for that allocator and to varying
degrees corresponding libraries for the last 6 years. I usually take
them in [1] if I have other stuff to run.

The cpumask stuff should not roll up through me, and I think likely you.
It's just a little unfortunate in timing as I was planning on respinning
the percpu hotplug stuff this week (not 100% sure anything will conflict
yet til I do it).

Thanks,
Dennis

[1] https://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git