netdev - Re: [PATCH net-next] net: inline napi_skb_cache

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Message-ID: <bc1b8d79-2229-486b-aea2-bbd71d1fc74f@redhat.com>
Date: Thu, 15 Jan 2026 12:29:47 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
 eric.dumazet@...il.com, "David S . Miller" <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next] net: inline napi_skb_cache_get()

On 1/12/26 2:15 PM, Eric Dumazet wrote:
> clang is inlining it already, gcc (14.2) does not.
> 
> Small space cost (215 bytes on x86_64) but faster sk_buff allocations.
> 
> $ scripts/bloat-o-meter -t net/core/skbuff.gcc.before.o net/core/skbuff.gcc.after.o
> add/remove: 0/1 grow/shrink: 4/1 up/down: 359/-144 (215)
> Function                                     old     new   delta
> __alloc_skb                                  471     611    +140
> napi_build_skb                               245     363    +118
> napi_alloc_skb                               331     416     +85
> skb_copy_ubufs                              1869    1885     +16
> skb_shift                                   1445    1413     -32
> napi_skb_cache_get                           112       -    -112
> Total: Before=59941, After=60156, chg +0.36%
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Not blocking this patch, but I'm wondering if we should consider
defining an 'inline_for_performance' macro for both documentation
purpose and to allow no inline for size-sensitive build.

Paolo