From patchwork Mon Sep 7 14:47:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "dust.li" X-Patchwork-Id: 261415 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=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham 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 A643EC433E2 for ; Mon, 7 Sep 2020 14:51:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6338E217BA for ; Mon, 7 Sep 2020 14:51:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729890AbgIGOtn (ORCPT ); Mon, 7 Sep 2020 10:49:43 -0400 Received: from out30-57.freemail.mail.aliyun.com ([115.124.30.57]:57729 "EHLO out30-57.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729987AbgIGOsk (ORCPT ); Mon, 7 Sep 2020 10:48:40 -0400 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R121e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04394; MF=dust.li@linux.alibaba.com; NM=1; PH=DS; RN=4; SR=0; TI=SMTPD_---0U8EuKxN_1599490077; Received: from localhost(mailfrom:dust.li@linux.alibaba.com fp:SMTPD_---0U8EuKxN_1599490077) by smtp.aliyun-inc.com(127.0.0.1); Mon, 07 Sep 2020 22:47:58 +0800 From: Dust Li To: "David S . Miller" , Eric Dumazet , Satoru Moriya Cc: netdev@vger.kernel.org Subject: [PATCH] net: tracepoint: fix print wrong sysctl_mem value Date: Mon, 7 Sep 2020 22:47:57 +0800 Message-Id: <20200907144757.43389-1-dust.li@linux.alibaba.com> X-Mailer: git-send-email 2.19.1.3.ge56e4f7 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org sysctl_mem is an point, and tracepoint entry do not support been visited like an array. Use 3 long type to get sysctl_mem instead. tracpoint output with and without this fix: - without fix: 28821.074 sock:sock_exceed_buf_limit:proto:UDP sysctl_mem=-1741233440,19,322156906942464 allocated=19 sysctl_rmem=4096 rmem_alloc=75008 sysctl_wmem=4096 wmem_alloc=1 wmem_queued=0 kind=SK_MEM_RECV - with fix: 2126.136 sock:sock_exceed_buf_limit:proto:UDP sysctl_mem=18,122845,184266 allocated=19 sysctl_rmem=4096 rmem_alloc=73728 sysctl_wmem=4096 wmem_alloc=1 wmem_queued=0 kind=SK_MEM_RECV Fixes: 3847ce32aea9fdf ("core: add tracepoints for queueing skb to rcvbuf") Signed-off-by: Dust Li --- include/trace/events/sock.h | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/include/trace/events/sock.h b/include/trace/events/sock.h index a966d4b5ab37..9118dd2353b7 100644 --- a/include/trace/events/sock.h +++ b/include/trace/events/sock.h @@ -98,7 +98,9 @@ TRACE_EVENT(sock_exceed_buf_limit, TP_STRUCT__entry( __array(char, name, 32) - __field(long *, sysctl_mem) + __field(long, sysctl_mem0) + __field(long, sysctl_mem1) + __field(long, sysctl_mem2) __field(long, allocated) __field(int, sysctl_rmem) __field(int, rmem_alloc) @@ -110,7 +112,9 @@ TRACE_EVENT(sock_exceed_buf_limit, TP_fast_assign( strncpy(__entry->name, prot->name, 32); - __entry->sysctl_mem = prot->sysctl_mem; + __entry->sysctl_mem0 = prot->sysctl_mem[0]; + __entry->sysctl_mem1 = prot->sysctl_mem[1]; + __entry->sysctl_mem2 = prot->sysctl_mem[2]; __entry->allocated = allocated; __entry->sysctl_rmem = sk_get_rmem0(sk, prot); __entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc); @@ -122,9 +126,9 @@ TRACE_EVENT(sock_exceed_buf_limit, TP_printk("proto:%s sysctl_mem=%ld,%ld,%ld allocated=%ld sysctl_rmem=%d rmem_alloc=%d sysctl_wmem=%d wmem_alloc=%d wmem_queued=%d kind=%s", __entry->name, - __entry->sysctl_mem[0], - __entry->sysctl_mem[1], - __entry->sysctl_mem[2], + __entry->sysctl_mem0, + __entry->sysctl_mem1, + __entry->sysctl_mem2, __entry->allocated, __entry->sysctl_rmem, __entry->rmem_alloc,