RE: [patch v2 00/14] Improve /proc/interrupts further and add a binary interface

[Michael Kelley]

From: Thomas Gleixner <tglx@xxxxxxxxxx> Sent: Friday, March 20, 2026 6:21 AM
> 
> This is a follow up to v1 which can be found here:
> 
>   https://lore.kernel.org/20260303150539.513068586@xxxxxxxxxx
> 
> The v1 cover letter contains a full analysis, explanation and numbers.
> 
> TLDR:
> 
>   - The performance of reading of /proc/interrupts has been improved
>     piecewise over the years, but most of the low hanging fruit has been
>     left on the table.
> 
>   - For a long time a binary readout interface was considered to be the
>     better option, but it never materialized.
> 
> The series fixes the real big performance issues and provides a design
> study for a binary interface.
> 

Tested in Hyper-V guests on x86/x64 and arm64. Did basic smoke tests
of taking a CPU offline, and removing a PCI device along with its IRQs,
then adding them back again. No issues seen except for a typo in the
Hyper-V reenlightenment IRQ text description as noted in my reply to
Patch 4 of the series. I did not do anything with the new binary
interface.

For the series (excluding the binary interface),

Tested-by: Michael Kelley <mhklinux@xxxxxxxxxxx>