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Tue, 18 Jun 2024 01:26:13 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFWqpCxWr0uOe6kQvSYzFQxJy29SIUhW3T6yuKBV46eMgVNLb1HfpI+xg2q6FhUZ3RLVF0LYA== X-Received: by 2002:a05:600c:1d1b:b0:421:74d4:f32c with SMTP id 5b1f17b1804b1-42304d7f7b9mr88461355e9.1.1718699173592; Tue, 18 Jun 2024 01:26:13 -0700 (PDT) Received: from gerbillo.redhat.com ([2a0d:3341:b0b4:c10::f71]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42301a7c850sm175348375e9.6.2024.06.18.01.26.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Jun 2024 01:26:13 -0700 (PDT) Message-ID: <294c30a62d415c9b641be32df2b527cfff19ef62.camel@redhat.com> Subject: Re: [PATCH v5 3/4] net: dropreason: use new __print_sym() in tracing From: Paolo Abeni To: Johannes Berg , linux-kernel@vger.kernel.org Cc: linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Johannes Berg Date: Tue, 18 Jun 2024 10:26:11 +0200 In-Reply-To: <20240614081956.19832-8-johannes@sipsolutions.net> References: <20240614081956.19832-6-johannes@sipsolutions.net> <20240614081956.19832-8-johannes@sipsolutions.net> Autocrypt: addr=pabeni@redhat.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-06-14 at 10:19 +0200, Johannes Berg wrote: > From: Johannes Berg >=20 > The __print_symbolic() could only ever print the core > drop reasons, since that's the way the infrastructure > works. Now that we have __print_sym() with all the > advantages mentioned in that commit, convert to that > and get all the drop reasons from all subsystems. As > we already have a list of them, that's really easy. >=20 > This is a little bit of .text (~100 bytes in my build) > and saves a lot of .data (~17k). >=20 > Signed-off-by: Johannes Berg > --- > include/net/dropreason.h | 5 +++++ > include/trace/events/skb.h | 16 +++----------- > net/core/skbuff.c | 43 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 51 insertions(+), 13 deletions(-) >=20 > diff --git a/include/net/dropreason.h b/include/net/dropreason.h > index 56cb7be92244..c157070b5303 100644 > --- a/include/net/dropreason.h > +++ b/include/net/dropreason.h > @@ -42,6 +42,11 @@ struct drop_reason_list { > extern const struct drop_reason_list __rcu * > drop_reasons_by_subsys[SKB_DROP_REASON_SUBSYS_NUM]; > =20 > +#ifdef CONFIG_TRACEPOINTS > +const char *drop_reason_lookup(unsigned long long value); > +void drop_reason_show(struct seq_file *m); > +#endif > + > void drop_reasons_register_subsys(enum skb_drop_reason_subsys subsys, > =09=09=09=09 const struct drop_reason_list *list); > void drop_reasons_unregister_subsys(enum skb_drop_reason_subsys subsys); > diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h > index 07e0715628ec..8a1a63f9e796 100644 > --- a/include/trace/events/skb.h > +++ b/include/trace/events/skb.h > @@ -8,15 +8,9 @@ > #include > #include > #include > +#include > =20 > -#undef FN > -#define FN(reason)=09TRACE_DEFINE_ENUM(SKB_DROP_REASON_##reason); > -DEFINE_DROP_REASON(FN, FN) > - > -#undef FN > -#undef FNe > -#define FN(reason)=09{ SKB_DROP_REASON_##reason, #reason }, > -#define FNe(reason)=09{ SKB_DROP_REASON_##reason, #reason } > +TRACE_DEFINE_SYM_FNS(drop_reason, drop_reason_lookup, drop_reason_show); > =20 > /* > * Tracepoint for free an sk_buff: > @@ -44,13 +38,9 @@ TRACE_EVENT(kfree_skb, > =20 > =09TP_printk("skbaddr=3D%p protocol=3D%u location=3D%pS reason: %s", > =09=09 __entry->skbaddr, __entry->protocol, __entry->location, > -=09=09 __print_symbolic(__entry->reason, > -=09=09=09=09 DEFINE_DROP_REASON(FN, FNe))) > +=09=09 __print_sym(__entry->reason, drop_reason )) Minor nit: if you have to repost for other reasons, ^^ here checkpatch complains for the extra space. Otherwise LGTM, Thanks! Paolo