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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56921C433EF for ; Tue, 22 Mar 2022 18:57:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230030AbiCVS6t (ORCPT ); Tue, 22 Mar 2022 14:58:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229846AbiCVS6n (ORCPT ); Tue, 22 Mar 2022 14:58:43 -0400 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F4C091548; Tue, 22 Mar 2022 11:57:15 -0700 (PDT) Received: by mail-pg1-x52d.google.com with SMTP id w21so9579888pgm.7; Tue, 22 Mar 2022 11:57:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=gAMBj1S29rgAzHcNPl/UWJtGAptXvHHW2Jh7MIwSDOM=; b=hmhlSxZTx6aS+hIMhHNUz2KF//sFEwtfxPJISnORBDnKoJz+FNhUrWg2su2tviz/cN J2Q7GYV3bp2NNybGH17XweiZlGNpdm2v3fJmudkY1dKQLA0nidLaj8syH+wdh0kWXaTJ +8duOg01rsa+Za8uuBZJxXAeeG6qxd004HiungJcyaasNl1SUbArMI6MlzxAIgZl8H2f JbSIS6PEIWgTPVFeM4R9fFClqdICrgKL0A8rMNKEiyFAi7zWa1mj9s03Ejwx+5ESUNRs jrVH//4MvM9ENJlifOH2YFl9dmEfWCWRCjYUbi3XL9jqgFTHiVWpHG1r8lpBiKe8ZqMJ ApGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=gAMBj1S29rgAzHcNPl/UWJtGAptXvHHW2Jh7MIwSDOM=; b=0I9hC0o8I84NG0a2akb1dd86lVaeaBNfZOte73H4o9qYN/x7SzY3YJhdJ0A1bDCe9P crXe+dF1pQI8LgRl+dY4qN+ngwejQWvmGiZImeR2rsByhizmesU9d2x7/eyourRA3VT4 l+lbACS65PPHr4gX/wqOh7uB9lJK2avhGteFziwxf2X7fOXiz+E+r1kVR+SXcXWyDU5f 1yuNpoCe4i+CMX2JEFhR1MYz11NqCwGSNTkIyLTBemngL5O4xu15kpn0rtLSDfg1Rj39 AYPGq4mYZNhCwVQ7Mh8tv4B1XmVXdB+bBtiqMSAFO2ze3Fja0eF1Fh5lOzCeqvaJPRuR EIGw== X-Gm-Message-State: AOAM531PyBtdQwZI8Z7G9eO3ZfvcPniA3gNmRKBzvkXADHcAniDBPO6h lTfnbY/y65eKzgNvVei1a1Cshyxl3PU= X-Google-Smtp-Source: ABdhPJz/yMJgmlsKxx/8y/7qKGZmUAeKx49YYWs9Wej7R+HBSQop0d4WzwpMbAKrAcafRuZhsCPbvA== X-Received: by 2002:a63:ea51:0:b0:380:7c35:188e with SMTP id l17-20020a63ea51000000b003807c35188emr23113078pgk.607.1647975435002; Tue, 22 Mar 2022 11:57:15 -0700 (PDT) Received: from balhae.hsd1.ca.comcast.net ([2601:647:4800:3540:c09f:7727:246c:bda2]) by smtp.gmail.com with ESMTPSA id u14-20020a056a00124e00b004fab8f3245fsm3772681pfi.149.2022.03.22.11.57.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Mar 2022 11:57:14 -0700 (PDT) Sender: Namhyung Kim From: Namhyung Kim To: Peter Zijlstra , Ingo Molnar , Will Deacon , Waiman Long , Boqun Feng Cc: LKML , Thomas Gleixner , Steven Rostedt , Byungchul Park , "Paul E. McKenney" , Mathieu Desnoyers , Arnd Bergmann , Radoslaw Burny , linux-arch@vger.kernel.org, bpf@vger.kernel.org, Hyeonggon Yoo <42.hyeyoo@gmail.com> Subject: [PATCH 1/2] locking: Add lock contention tracepoints Date: Tue, 22 Mar 2022 11:57:08 -0700 Message-Id: <20220322185709.141236-2-namhyung@kernel.org> X-Mailer: git-send-email 2.35.1.894.gb6a874cedc-goog In-Reply-To: <20220322185709.141236-1-namhyung@kernel.org> References: <20220322185709.141236-1-namhyung@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds two new lock contention tracepoints like below: * lock:contention_begin * lock:contention_end The lock:contention_begin takes a flags argument to classify locks. I found it useful to identify what kind of locks it's tracing like if it's spinning or sleeping, reader-writer lock, real-time, and per-cpu. Move tracepoint definitions into mutex.c so that we can use them without lockdep. Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Namhyung Kim --- include/trace/events/lock.h | 61 +++++++++++++++++++++++++++++++++++-- kernel/locking/lockdep.c | 1 - kernel/locking/mutex.c | 3 ++ 3 files changed, 61 insertions(+), 4 deletions(-) diff --git a/include/trace/events/lock.h b/include/trace/events/lock.h index d7512129a324..b9b6e3edd518 100644 --- a/include/trace/events/lock.h +++ b/include/trace/events/lock.h @@ -5,11 +5,21 @@ #if !defined(_TRACE_LOCK_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_LOCK_H -#include +#include #include +/* flags for lock:contention_begin */ +#define LCB_F_SPIN (1U << 0) +#define LCB_F_READ (1U << 1) +#define LCB_F_WRITE (1U << 2) +#define LCB_F_RT (1U << 3) +#define LCB_F_PERCPU (1U << 4) + + #ifdef CONFIG_LOCKDEP +#include + TRACE_EVENT(lock_acquire, TP_PROTO(struct lockdep_map *lock, unsigned int subclass, @@ -78,8 +88,53 @@ DEFINE_EVENT(lock, lock_acquired, TP_ARGS(lock, ip) ); -#endif -#endif +#endif /* CONFIG_LOCK_STAT */ +#endif /* CONFIG_LOCKDEP */ + +TRACE_EVENT(contention_begin, + + TP_PROTO(void *lock, unsigned int flags), + + TP_ARGS(lock, flags), + + TP_STRUCT__entry( + __field(void *, lock_addr) + __field(unsigned int, flags) + ), + + TP_fast_assign( + __entry->lock_addr = lock; + __entry->flags = flags; + ), + + TP_printk("%p (flags=%s)", __entry->lock_addr, + __print_flags(__entry->flags, "|", + { LCB_F_SPIN, "SPIN" }, + { LCB_F_READ, "READ" }, + { LCB_F_WRITE, "WRITE" }, + { LCB_F_RT, "RT" }, + { LCB_F_PERCPU, "PERCPU" } + )) +); + +TRACE_EVENT(contention_end, + + TP_PROTO(void *lock, int ret), + + TP_ARGS(lock, ret), + + TP_STRUCT__entry( + __field(void *, lock_addr) + __field(int, ret) + ), + + TP_fast_assign( + __entry->lock_addr = lock; + __entry->ret = ret; + ), + + TP_printk("%p (ret=%d)", __entry->lock_addr, __entry->ret) +); #endif /* _TRACE_LOCK_H */ diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 50036c10b518..08f8fb6a2d1e 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -60,7 +60,6 @@ #include "lockdep_internals.h" -#define CREATE_TRACE_POINTS #include #ifdef CONFIG_PROVE_LOCKING diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 5e3585950ec8..ee2fd7614a93 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -30,6 +30,9 @@ #include #include +#define CREATE_TRACE_POINTS +#include + #ifndef CONFIG_PREEMPT_RT #include "mutex.h" -- 2.35.1.894.gb6a874cedc-goog