linux-kernel - Re: [PATCH net-next] net: skbuff: Skip early return in skb

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Message-ID: <CANn89iJ7vw5KzPqBuaoe2g9AKUnC0vsSST-6Xqw4fvL5n9gkJQ@mail.gmail.com>
Date: Tue, 30 Jul 2024 16:21:47 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>, Florian Westphal <fw@...len.de>, Breno Leitao <leitao@...ian.org>, 
	"David S. Miller" <davem@...emloft.net>, leit@...a.com, Chris Mason <clm@...com>, 
	"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: skbuff: Skip early return in skb_unref when debugging

On Tue, Jul 30, 2024 at 4:10 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Tue, 30 Jul 2024 13:15:57 +0200 Paolo Abeni wrote:
> > > If thats the case why does it exist at all?
>
> +1
>
> > > I was under impression that entire reason for CONFIG_DEBUG_NET was
> > > to enable more checks for fuzzers and the like, i.e. NOT for production
> > > kernels.
> >
> > I feel like I already had this discussion and I forgot the outcome, if
> > so I'm sorry. To me the "but is safe to select." part in the knob
> > description means this could be enabled in production, and AFAICS the
> > CONFIG_DEBUG_NET-enabled code so far respects that assumption.
>
> I believe the previous discussion was page pool specific and there
> wasn't as much of a conclusion as an acquiescence (read: we had more
> important things on our minds than that argument ;)).
>
> Should we set a bar for how much perf impact is okay?
>
> FTR I suspect there will be no measurable perf impact here.

Same feeling here, I think this patch is fine really.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>