Re: [PATCH v5 0/8] Generic IRQ entry/exit support for powerpc

[Mukesh Kumar Chaurasiya]

On Fri, Sep 11, 2026 at 02:24:44PM +0200, Jirka Hladky wrote:
> Hi Mukesh,
> 
> I built 7.2-rc4 from source with your proposed rcu_ct_kernel_exit_qs()
> patch and re-ran the same sweep - it shows minor improvements vs. stock
> 7.2-rc4
> 
> Full results, median bogo-ops/sec over 15 runs each:
> 
>   Mode          7.1        7.2-rc4     7.2-rc4+patch
>   Enforcing     68,275     70,154      71,585
>   Permissive    68,082     67,166      68,705
>   Disabled      99,654     100,510     101,016
> 
> The patch vs. stock 7.2-rc4 differences (+4.8%/+0.9%/+1.3%) are hard
> to distinquish
> from run-to-run noise we've been seeing on this hardware, but they are
> consistent.
> 
> I think it's a useful efficiency improvement on its own merits, as it
> does avoid the unconditional rcu_preempt_deferred_qs() call on the common
> fast path. Even with only small performance gains, the change looks correct
> and low-risk to me, and I'd like to see it land in mainline. Let me
> know if there's
> anything else you'd like me to test before you post it, or if it's
> already queued up
> separately from this thread.
> 
> Thank you!
> Jirka
> 
Hey Jirka,

Thanks for the verification. I think that's all i wanted. I would send
out a patch for this soon. Thanks for all the support.

Regards,
Mukesh
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