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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 12E06C4360F for ; Thu, 4 Apr 2019 17:44:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E152320882 for ; Thu, 4 Apr 2019 17:44:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729712AbfDDRoK (ORCPT ); Thu, 4 Apr 2019 13:44:10 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37342 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729529AbfDDRnw (ORCPT ); Thu, 4 Apr 2019 13:43:52 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 668849D420; Thu, 4 Apr 2019 17:43:52 +0000 (UTC) Received: from llong.com (dhcp-17-19.bos.redhat.com [10.18.17.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0F9F29800; Thu, 4 Apr 2019 17:43:50 +0000 (UTC) From: Waiman Long To: Peter Zijlstra , Ingo Molnar , Will Deacon , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Arnd Bergmann , Borislav Petkov , "H. Peter Anvin" , Davidlohr Bueso , Linus Torvalds , Andrew Morton , Tim Chen , Waiman Long Subject: [PATCH-tip v4 09/11] locking/lock_events: Don't show pvqspinlock events on bare metal Date: Thu, 4 Apr 2019 13:43:18 -0400 Message-Id: <20190404174320.22416-10-longman@redhat.com> In-Reply-To: <20190404174320.22416-1-longman@redhat.com> References: <20190404174320.22416-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Thu, 04 Apr 2019 17:43:52 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On bare metail, the pvqspinlock event counts will always be 0. So there is no point in showing their corresponding debugfs files. So they are skipped in this case. Signed-off-by: Waiman Long Acked-by: Davidlohr Bueso --- kernel/locking/lock_events.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/kernel/locking/lock_events.c b/kernel/locking/lock_events.c index 71c36d1fb834..fa2c2f951c6b 100644 --- a/kernel/locking/lock_events.c +++ b/kernel/locking/lock_events.c @@ -115,6 +115,29 @@ static const struct file_operations fops_lockevent = { .llseek = default_llseek, }; +#ifdef CONFIG_PARAVIRT_SPINLOCKS +#include + +static bool __init skip_lockevent(const char *name) +{ + static int pv_on __initdata = -1; + + if (pv_on < 0) + pv_on = !pv_is_native_spin_unlock(); + /* + * Skip PV qspinlock events on bare metal. + */ + if (!pv_on && !memcmp(name, "pv_", 3)) + return true; + return false; +} +#else +static inline bool skip_lockevent(const char *name) +{ + return false; +} +#endif + /* * Initialize debugfs for the locking event counts. */ @@ -133,10 +156,13 @@ static int __init init_lockevent_counts(void) * root is allowed to do the read/write to limit impact to system * performance. */ - for (i = 0; i < lockevent_num; i++) + for (i = 0; i < lockevent_num; i++) { + if (skip_lockevent(lockevent_names[i])) + continue; if (!debugfs_create_file(lockevent_names[i], 0400, d_counts, (void *)(long)i, &fops_lockevent)) goto fail_undo; + } if (!debugfs_create_file(lockevent_names[LOCKEVENT_reset_cnts], 0200, d_counts, (void *)(long)LOCKEVENT_reset_cnts, -- 2.18.1