linux-kernel - Re: [PATCH v5 0/5] powerpc/smp: Topology and shared processor optimizations

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Message-Id: <170315510022.2192823.3630103323682637969.b4-ty@ellerman.id.au>
Date: Thu, 21 Dec 2023 21:38:20 +1100
From: Michael Ellerman <patch-notifications@...erman.id.au>
To: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, Christophe Leroy <christophe.leroy@...roup.eu>, Josh Poimboeuf <jpoimboe@...nel.org>, linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>, Nicholas Piggin <npiggin@...il.com>, "Paul E. McKenney" <paulmck@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Rohan McLure <rmclure@...ux.ibm.com>, Valentin Schneider <vschneid@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, Aneesh <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v5 0/5] powerpc/smp: Topology and shared processor optimizations

On Thu, 14 Dec 2023 23:37:10 +0530, Srikar Dronamraju wrote:
> PowerVM systems configured in shared processors mode have some unique
> challenges. Some device-tree properties will be missing on a shared
> processor. Hence some sched domains may not make sense for shared processor
> systems.
> 
> Most shared processor systems are over-provisioned. Underlying PowerVM
> Hypervisor would schedule at a Big Core granularity. The most recent power
> processors support two almost independent cores. In a lightly loaded
> condition, it helps the overall system performance if we pack to lesser
> number of Big Cores.
> 
> [...]

Applied to powerpc/next.

[1/5] powerpc/smp: Enable Asym packing for cores on shared processor
      https://git.kernel.org/powerpc/c/aa80c6343fcf53cbc29f84ba9f89ca87d4e41350
[2/5] powerpc/smp: Disable MC domain for shared processor
      https://git.kernel.org/powerpc/c/0e1c1986e0e65746daa05405d7747ce882f83cf1
[3/5] powerpc/smp: Add __ro_after_init attribute
      https://git.kernel.org/powerpc/c/fd535a858ebeb1f478b1d065b6c057f52aad483a
[4/5] powerpc/smp: Avoid asym packing within thread_group of a core
      https://git.kernel.org/powerpc/c/0e93f1c780e8fd315f1262467b7d35eb6f766d2f
[5/5] powerpc/smp: Dynamically build Powerpc topology
      https://git.kernel.org/powerpc/c/c46975715f5a7b941aa09bc0539a8dbe297f308f

cheers