netdev - Re: [PATCH bpf-next v2] net: don't include filter.h from net/sock.h

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Date:   Tue, 28 Dec 2021 17:33:39 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>, ast@...nel.org,
        daniel@...earbox.net
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Marc Kleine-Budde <mkl@...gutronix.de>, marcel@...tmann.org,
        johan.hedberg@...il.com, luiz.dentz@...il.com, dledford@...hat.com,
        jgg@...pe.ca, mustafa.ismail@...el.com, shiraz.saleem@...el.com,
        leon@...nel.org, ap420073@...il.com, wg@...ndegger.com,
        woojung.huh@...rochip.com, andrew@...n.ch,
        vivien.didelot@...il.com, olteanv@...il.com,
        george.mccollister@...il.com, michael.chan@...adcom.com,
        jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        hawk@...nel.org, john.fastabend@...il.com, tariqt@...dia.com,
        saeedm@...dia.com, ecree.xilinx@...il.com,
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        jiri@...dia.com, wintera@...ux.ibm.com, wenjia@...ux.ibm.com,
        pablo@...filter.org, kadlec@...filter.org, fw@...len.de,
        ralf@...ux-mips.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
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        arnd@...db.de, linux-bluetooth@...r.kernel.org,
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        ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
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        bridge@...ts.linux-foundation.org,
        linux-decnet-user@...ts.sourceforge.net,
        linux-s390@...r.kernel.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH bpf-next v2] net: don't include filter.h from net/sock.h



On 12/28/2021 4:49 PM, Jakub Kicinski wrote:
> sock.h is pretty heavily used (5k objects rebuilt on x86 after
> it's touched). We can drop the include of filter.h from it and
> add a forward declaration of struct sk_filter instead.
> This decreases the number of rebuilt objects when bpf.h
> is touched from ~5k to ~1k.
> 
> There's a lot of missing includes this was masking. Primarily
> in networking tho, this time.
> 
> Acked-by: Marc Kleine-Budde <mkl@...gutronix.de>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Acked-by: Florian Fainelli <f.fainelli@...il.com>

It would be nice if we used the number of files rebuilt because of a 
header file change as another metric that the kernel is evaluated with 
from release to release (or even on a commit by commit basis). Food for 
thought.
-- 
Florian