netdev - Re: [PATCH] net :mana : Add per-cpu stats for MANA device

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Date: Mon, 11 Mar 2024 09:41:42 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Shradha Gupta <shradhagupta@...ux.microsoft.com>, Haiyang Zhang
 <haiyangz@...rosoft.com>, Shradha Gupta <shradhagupta@...rosoft.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
 "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Ajay Sharma
 <sharmaajay@...rosoft.com>, Leon Romanovsky <leon@...nel.org>, Thomas
 Gleixner <tglx@...utronix.de>, Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>, KY Srinivasan <kys@...rosoft.com>, Wei Liu
 <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>, Long Li
 <longli@...rosoft.com>, Michael Kelley <mikelley@...rosoft.com>
Subject: Re: [PATCH] net :mana : Add per-cpu stats for MANA device

On Mon, 11 Mar 2024 08:51:26 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Sun, 10 Mar 2024 21:19:50 -0700 Shradha Gupta wrote:
> > > Seems unlikely, but if it does work we should enable it for all
> > > devices, no driver by driver.    
> > You mean, if the usecase seems valid we should try to extend the framework
> > mentioned by Rahul (https://lore.kernel.org/lkml/20240307072923.6cc8a2ba@kernel.org/)
> > to include these stats as well?  
> 
> "framework" is a big word, but yes, add a netlink command to get 
> pcpu stats. Let's focus on the usefulness before investing time
> in a rewrite, tho.

Couldn't userspace do the same thing by looking at /proc/interrupts
and PCI info?