From patchwork Mon Jun 10 01:01:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: chenbaodong X-Patchwork-Id: 10983903 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3905313AD for ; Mon, 10 Jun 2019 01:04:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 275EC2875F for ; Mon, 10 Jun 2019 01:04:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 17B50287D1; Mon, 10 Jun 2019 01:04:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A3B622875F for ; Mon, 10 Jun 2019 01:04:35 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1ha8iU-0003QR-F6; Mon, 10 Jun 2019 01:03:18 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1ha8iT-0003QJ-93 for xen-devel@lists.xenproject.org; Mon, 10 Jun 2019 01:03:17 +0000 X-Inumbo-ID: 8455306e-8b1b-11e9-bf86-f76a39bc58d7 Received: from mxnavi-mail.mxnavi.com (unknown [116.90.87.199]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 8455306e-8b1b-11e9-bf86-f76a39bc58d7; Mon, 10 Jun 2019 01:03:13 +0000 (UTC) Received: from localhost.localdomain (61.161.186.150) by mxnavi-mail.mxnavi.com (116.90.87.199) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1591.10; Mon, 10 Jun 2019 08:59:57 +0800 From: Baodong Chen To: Date: Mon, 10 Jun 2019 09:01:55 +0800 Message-ID: <1560128515-20347-1-git-send-email-chenbaodong@mxnavi.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [61.161.186.150] X-ClientProxiedBy: mxnavi-mail.mxnavi.com (116.90.87.199) To mxnavi-mail.mxnavi.com (116.90.87.199) Subject: [Xen-devel] [PATCH v4] xen: make tracebuffer configurable X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Tim Deegan , Julien Grall , Jan Beulich , Baodong Chen Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Xen internal running status(trace event at pre-defined trace point) will be saved to trace memory when enabled. Trace event data and config params can be read/changed by system control hypercall at run time. Can be disabled for smaller code footprint. Signed-off-by: Baodong Chen Acked-by: George Dunlap #include #include +#ifdef CONFIG_TRACEBUFFER /* Used to initialise trace buffer functionality */ void init_trace_bufs(void); @@ -47,6 +53,26 @@ static inline void trace_var(u32 event, int cycles, int extra, void __trace_hypercall(uint32_t event, unsigned long op, const xen_ulong_t *args); +#else +static inline void init_trace_bufs(void) {} +static inline int tb_control(struct xen_sysctl_tbuf_op *tbc) +{ + return -ENOSYS; +} + +static inline int trace_will_trace_event(uint32_t event) +{ + return 0; +} + +static inline void trace_var(uint32_t event, int cycles, int extra, + const void *extra_data) {} +static inline void __trace_var(uint32_t event, bool cycles, unsigned int extra, + const void *extra_data) {} +static inline void __trace_hypercall(uint32_t event, unsigned long op, + const xen_ulong_t *args) {} +#endif + /* Convenience macros for calling the trace function. */ #define TRACE_0D(_e) \ do { \