linux-kernel - Re: [RFC V2 0/8] Generic IRQ entry/exit support for powerpc

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Message-ID: <87ikhqrqre.ffs@tglx>
Date: Wed, 10 Sep 2025 22:34:13 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Mukesh Kumar Chaurasiya <mchauras@...ux.ibm.com>, maddy@...ux.ibm.com,
 mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
 oleg@...hat.com, kees@...nel.org, luto@...capital.net, wad@...omium.org,
 mchauras@...ux.ibm.com, deller@....de, ldv@...ace.io, macro@...am.me.uk,
 charlie@...osinc.com, akpm@...ux-foundation.org, bigeasy@...utronix.de,
 ankur.a.arora@...cle.com, sshegde@...ux.ibm.com, naveen@...nel.org,
 thomas.weissschuh@...utronix.de, Jason@...c4.com, peterz@...radead.org,
 namcao@...utronix.de, kan.liang@...ux.intel.com, mingo@...nel.org,
 oliver.upton@...ux.dev, mark.barnett@....com, atrajeev@...ux.vnet.ibm.com,
 rppt@...nel.org, coltonlewis@...gle.com, linuxppc-dev@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org
Subject: Re: [RFC V2 0/8] Generic IRQ entry/exit support for powerpc

On Tue, Sep 09 2025 at 02:32, Mukesh Kumar Chaurasiya wrote:
> Adding support for the generic irq entry/exit handling for PowerPC. The
> goal is to bring PowerPC in line with other architectures that already
> use the common irq entry infrastructure, reducing duplicated code and
> making it easier to share future changes in entry/exit paths.
>
> This is slightly tested on ppc64le.
>
> The performance benchmarks from perf bench basic syscall are below:
>
> | Metric     | W/O Generic Framework | With Generic Framework | Improvement |
> | ---------- | --------------------- | ---------------------- | ----------- |
> | Total time | 0.885 [sec]           | 0.880 [sec]            | ~0.56%      |
> | usecs/op   | 0.088518              | 0.088005               | ~0.58%      |
> | ops/sec    | 1,12,97,086           | 1,13,62,977            | ~0.58%      |
>
> Thats close to 0.6% improvement with this.

Cool!

>  18 files changed, 698 insertions(+), 810 deletions(-)

Thanks for moving ppc over to this. Makes everyones life easier!

       tglx