linux-kernel - Re: [PATCH v3 0/6] powerpc: queued spinlocks and rwlocks

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Message-ID: <a9834278-25bf-90e9-10f2-cd10e5407ff6@redhat.com>
Date:   Wed, 8 Jul 2020 19:54:34 -0400
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, Anton Blanchard <anton@...abs.org>,
        Boqun Feng <boqun.feng@...il.com>, kvm-ppc@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH v3 0/6] powerpc: queued spinlocks and rwlocks

On 7/8/20 4:41 AM, Peter Zijlstra wrote:
> On Tue, Jul 07, 2020 at 03:57:06PM +1000, Nicholas Piggin wrote:
>> Yes, powerpc could certainly get more performance out of the slow
>> paths, and then there are a few parameters to tune.
> Can you clarify? The slow path is already in use on ARM64 which is weak,
> so I doubt there's superfluous serialization present. And Will spend a
> fair amount of time on making that thing guarantee forward progressm, so
> there just isn't too much room to play.
>
>> We don't have a good alternate patching for function calls yet, but
>> that would be something to do for native vs pv.
> Going by your jump_label implementation, support for static_call should
> be fairly straight forward too, no?
>
>    https://lkml.kernel.org/r/20200624153024.794671356@infradead.org
>
Speaking of static_call, I am also looking forward to it. Do you have an 
idea when that will be merged?

Cheers,
Longman