netdev - Re: [RFC net-next] net: page_pool: fix recycle stats for percpu page

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Date: Thu, 15 Feb 2024 16:31:50 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
	davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
	hawk@...nel.org, ilias.apalodimas@...aro.org,
	linyunsheng@...wei.com, toke@...hat.com
Subject: Re: [RFC net-next] net: page_pool: fix recycle stats for percpu
 page_pool allocator

> On Thu, 15 Feb 2024 14:41:52 +0100 Alexander Lobakin wrote:
> > For example, if I have an Rx queue always pinned to one CPU, I might
> > want to create a PP for this queue with the cpuid set already to save
> > some cycles when recycling. We might also reuse cpuid later for some
> > more optimizations or features.
> 
> You say "pin Rx queue to one CPU" like that's actually possible to do
> reliably :)
> 
> > Maybe add a new PP_FLAG indicating that system percpu PP stats should be
> > used?
> 
> Part of me feels like checking the dev pointer would be good enough.
> It may make sense to create more per CPU pools for particular devices
> further down, but creating more pools without no dev / DMA mapping
> makes no sense, right?
> 
> Dunno if looking at dev is not too hacky, tho, flags are cheap.

I would vote for a dedicated flag ;)

Regards,
Lorenzo

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