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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 51AC3ECE599 for ; Wed, 16 Oct 2019 22:15:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 27DCC21925 for ; Wed, 16 Oct 2019 22:15:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571264103; bh=ctx9m1P2qHO9OhbiDy0lfGlpY9jIrCPAipH0YS0yzCc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Y9CweyBOTTy1kcJ3c5Ws+JvNQbpkcQnCNyN6ZzlWBME/lrE73VN7p/2gheameih3E 5impAfjG1R4kXxibke4on+spEgkvZfs0x2Za/cAiFLTdaOYgFEFywy0eYqEp2dThrb P999diSJIbhtlh5JdMwImxlUL3s0wKGQGMEfnbfk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395261AbfJPVze (ORCPT ); Wed, 16 Oct 2019 17:55:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:46206 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2395230AbfJPVz3 (ORCPT ); Wed, 16 Oct 2019 17:55:29 -0400 Received: from localhost (unknown [192.55.54.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F281B21D7D; Wed, 16 Oct 2019 21:55:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571262929; bh=ctx9m1P2qHO9OhbiDy0lfGlpY9jIrCPAipH0YS0yzCc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PfZHFRCKW0mvsZfYjIOnpX/p50q7yAf0JZEj23WEAqnNTd1pgZoD+5aJzHJqiRjeO 7+06lw/a2jZkpd9AgXmEs/Ygu0ki9cDzjEpqgKlt0FIOmQSsHJMPGADBkTFzFFvco4 iwDaoMcVK80HCCq4Ahcf0aNTYgYpk0yVzzRjXYxA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Srivatsa S. Bhat (VMware)" , "Steven Rostedt (VMware)" Subject: [PATCH 4.9 89/92] tracing/hwlat: Dont ignore outer-loop duration when calculating max_latency Date: Wed, 16 Oct 2019 14:51:02 -0700 Message-Id: <20191016214848.563153457@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191016214759.600329427@linuxfoundation.org> References: <20191016214759.600329427@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Srivatsa S. Bhat (VMware) commit fc64e4ad80d4b72efce116f87b3174f0b7196f8e upstream. max_latency is intended to record the maximum ever observed hardware latency, which may occur in either part of the loop (inner/outer). So we need to also consider the outer-loop sample when updating max_latency. Link: http://lkml.kernel.org/r/157073345463.17189.18124025522664682811.stgit@srivatsa-ubuntu Fixes: e7c15cd8a113 ("tracing: Added hardware latency tracer") Cc: stable@vger.kernel.org Signed-off-by: Srivatsa S. Bhat (VMware) Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Greg Kroah-Hartman --- kernel/trace/trace_hwlat.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/trace/trace_hwlat.c +++ b/kernel/trace/trace_hwlat.c @@ -257,6 +257,8 @@ static int get_sample(void) /* Keep a running maximum ever recorded hardware latency */ if (sample > tr->max_latency) tr->max_latency = sample; + if (outer_sample > tr->max_latency) + tr->max_latency = outer_sample; } out: