From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9726EC4332D for ; Thu, 11 Mar 2021 09:46:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CFC864F95 for ; Thu, 11 Mar 2021 09:46:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232144AbhCKJqA (ORCPT ); Thu, 11 Mar 2021 04:46:00 -0500 Received: from out30-131.freemail.mail.aliyun.com ([115.124.30.131]:46613 "EHLO out30-131.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232142AbhCKJpi (ORCPT ); Thu, 11 Mar 2021 04:45:38 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R741e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=tonylu@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0URT4Fz0_1615455935; Received: from localhost(mailfrom:tonylu@linux.alibaba.com fp:SMTPD_---0URT4Fz0_1615455935) by smtp.aliyun-inc.com(127.0.0.1); Thu, 11 Mar 2021 17:45:36 +0800 From: Tony Lu To: rostedt@goodmis.org, eric.dumazet@gmail.com, mingo@redhat.com Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH] tracing: remove holes in events Date: Thu, 11 Mar 2021 17:44:15 +0800 Message-Id: <20210311094414.12774-1-tonylu@linux.alibaba.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are some holes in the event definitions, spaces are wasted. Based on the analysis result of pahole and event format files, 22 events have more than one hole. To change less and fix worst, 5 events are picked up and fixed in this patch according the following rules. Rules: - try not to affect reading habit and understanding of the fields; - can be completely fixed (all holes are removed); NOTES: - changing the order of event fields breaks API compatibility, programs should parse and determine the real data order at runtime, instead of hard-coded the order of fields; - reduce holes as much as possible when adding / modifying; Summary (#event_name #before -> #after): 1. net_dev_start_xmit 5 holes (10 bytes) -> 0 2. net_dev_rx_verbose_template 6 holes (17 bytes) -> 0 3. tcp_probe 3 holes (8 bytes) -> 0 4. qdisc_dequeue 2 holes (8 bytes) -> 0 5. rpc_xdr_alignment 2 holes (8 bytes) -> 0 Link: https://www.spinics.net/lists/netdev/msg726308.html Link: https://www.spinics.net/lists/netdev/msg726451.html Suggested-by: Steven Rostedt Signed-off-by: Tony Lu --- include/trace/events/net.h | 42 +++++++++++++++++------------------ include/trace/events/qdisc.h | 4 ++-- include/trace/events/sunrpc.h | 4 ++-- include/trace/events/tcp.h | 2 +- 4 files changed, 26 insertions(+), 26 deletions(-) diff --git a/include/trace/events/net.h b/include/trace/events/net.h index 2399073c3afc..b1db7ab88d4b 100644 --- a/include/trace/events/net.h +++ b/include/trace/events/net.h @@ -20,18 +20,18 @@ TRACE_EVENT(net_dev_start_xmit, TP_STRUCT__entry( __string( name, dev->name ) __field( u16, queue_mapping ) + __field( u16, protocol ) __field( const void *, skbaddr ) + __field( u8, ip_summed ) __field( bool, vlan_tagged ) __field( u16, vlan_proto ) __field( u16, vlan_tci ) - __field( u16, protocol ) - __field( u8, ip_summed ) + __field( bool, transport_offset_valid) + __field( u8, tx_flags ) __field( unsigned int, len ) __field( unsigned int, data_len ) __field( int, network_offset ) - __field( bool, transport_offset_valid) __field( int, transport_offset) - __field( u8, tx_flags ) __field( u16, gso_size ) __field( u16, gso_segs ) __field( u16, gso_type ) @@ -40,19 +40,19 @@ TRACE_EVENT(net_dev_start_xmit, TP_fast_assign( __assign_str(name, dev->name); __entry->queue_mapping = skb->queue_mapping; + __entry->protocol = ntohs(skb->protocol); __entry->skbaddr = skb; + __entry->ip_summed = skb->ip_summed; __entry->vlan_tagged = skb_vlan_tag_present(skb); __entry->vlan_proto = ntohs(skb->vlan_proto); __entry->vlan_tci = skb_vlan_tag_get(skb); - __entry->protocol = ntohs(skb->protocol); - __entry->ip_summed = skb->ip_summed; + __entry->transport_offset_valid = + skb_transport_header_was_set(skb); + __entry->tx_flags = skb_shinfo(skb)->tx_flags; __entry->len = skb->len; __entry->data_len = skb->data_len; __entry->network_offset = skb_network_offset(skb); - __entry->transport_offset_valid = - skb_transport_header_was_set(skb); __entry->transport_offset = skb_transport_offset(skb); - __entry->tx_flags = skb_shinfo(skb)->tx_flags; __entry->gso_size = skb_shinfo(skb)->gso_size; __entry->gso_segs = skb_shinfo(skb)->gso_segs; __entry->gso_type = skb_shinfo(skb)->gso_type; @@ -170,23 +170,23 @@ DECLARE_EVENT_CLASS(net_dev_rx_verbose_template, TP_STRUCT__entry( __string( name, skb->dev->name ) __field( unsigned int, napi_id ) - __field( u16, queue_mapping ) __field( const void *, skbaddr ) + __field( u16, queue_mapping ) + __field( u8, ip_summed ) __field( bool, vlan_tagged ) __field( u16, vlan_proto ) __field( u16, vlan_tci ) __field( u16, protocol ) - __field( u8, ip_summed ) - __field( u32, hash ) __field( bool, l4_hash ) + __field( bool, mac_header_valid) + __field( int, mac_header ) __field( unsigned int, len ) __field( unsigned int, data_len ) __field( unsigned int, truesize ) - __field( bool, mac_header_valid) - __field( int, mac_header ) - __field( unsigned char, nr_frags ) + __field( u32, hash ) __field( u16, gso_size ) __field( u16, gso_type ) + __field( unsigned char, nr_frags ) ), TP_fast_assign( @@ -196,23 +196,23 @@ DECLARE_EVENT_CLASS(net_dev_rx_verbose_template, #else __entry->napi_id = 0; #endif - __entry->queue_mapping = skb->queue_mapping; __entry->skbaddr = skb; + __entry->queue_mapping = skb->queue_mapping; + __entry->ip_summed = skb->ip_summed; __entry->vlan_tagged = skb_vlan_tag_present(skb); __entry->vlan_proto = ntohs(skb->vlan_proto); __entry->vlan_tci = skb_vlan_tag_get(skb); __entry->protocol = ntohs(skb->protocol); - __entry->ip_summed = skb->ip_summed; - __entry->hash = skb->hash; __entry->l4_hash = skb->l4_hash; + __entry->mac_header_valid = skb_mac_header_was_set(skb); + __entry->mac_header = skb_mac_header(skb) - skb->data; __entry->len = skb->len; __entry->data_len = skb->data_len; __entry->truesize = skb->truesize; - __entry->mac_header_valid = skb_mac_header_was_set(skb); - __entry->mac_header = skb_mac_header(skb) - skb->data; - __entry->nr_frags = skb_shinfo(skb)->nr_frags; + __entry->hash = skb->hash; __entry->gso_size = skb_shinfo(skb)->gso_size; __entry->gso_type = skb_shinfo(skb)->gso_type; + __entry->nr_frags = skb_shinfo(skb)->nr_frags; ), TP_printk("dev=%s napi_id=%#x queue_mapping=%u skbaddr=%p vlan_tagged=%d vlan_proto=0x%04x vlan_tci=0x%04x protocol=0x%04x ip_summed=%d hash=0x%08x l4_hash=%d len=%u data_len=%u truesize=%u mac_header_valid=%d mac_header=%d nr_frags=%d gso_size=%d gso_type=%#x", diff --git a/include/trace/events/qdisc.h b/include/trace/events/qdisc.h index 330d32d84485..9e7d00256785 100644 --- a/include/trace/events/qdisc.h +++ b/include/trace/events/qdisc.h @@ -22,8 +22,8 @@ TRACE_EVENT(qdisc_dequeue, __field( struct Qdisc *, qdisc ) __field(const struct netdev_queue *, txq ) __field( int, packets ) - __field( void *, skbaddr ) __field( int, ifindex ) + __field( void *, skbaddr ) __field( u32, handle ) __field( u32, parent ) __field( unsigned long, txq_state) @@ -34,8 +34,8 @@ TRACE_EVENT(qdisc_dequeue, __entry->qdisc = qdisc; __entry->txq = txq; __entry->packets = skb ? packets : 0; - __entry->skbaddr = skb; __entry->ifindex = txq->dev ? txq->dev->ifindex : 0; + __entry->skbaddr = skb; __entry->handle = qdisc->handle; __entry->parent = qdisc->parent; __entry->txq_state = txq->state; diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h index 036eb1f5c133..39f4fdcf4d0f 100644 --- a/include/trace/events/sunrpc.h +++ b/include/trace/events/sunrpc.h @@ -715,8 +715,8 @@ TRACE_EVENT(rpc_xdr_alignment, __field(unsigned int, task_id) __field(unsigned int, client_id) __field(int, version) - __field(size_t, offset) __field(unsigned int, copied) + __field(size_t, offset) __field(const void *, head_base) __field(size_t, head_len) __field(const void *, tail_base) @@ -739,8 +739,8 @@ TRACE_EVENT(rpc_xdr_alignment, __entry->version = task->tk_client->cl_vers; __assign_str(procedure, task->tk_msg.rpc_proc->p_name) - __entry->offset = offset; __entry->copied = copied; + __entry->offset = offset; __entry->head_base = xdr->buf->head[0].iov_base, __entry->head_len = xdr->buf->head[0].iov_len, __entry->page_len = xdr->buf->page_len, diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h index ba94857eea11..831abc267373 100644 --- a/include/trace/events/tcp.h +++ b/include/trace/events/tcp.h @@ -248,8 +248,8 @@ TRACE_EVENT(tcp_probe, __field(__u16, sport) __field(__u16, dport) __field(__u16, family) - __field(__u32, mark) __field(__u16, data_len) + __field(__u32, mark) __field(__u32, snd_nxt) __field(__u32, snd_una) __field(__u32, snd_cwnd) -- 2.19.1.6.gb485710b