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 7D76FC7618D for ; Thu, 6 Apr 2023 09:57:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235374AbjDFJ5s (ORCPT ); Thu, 6 Apr 2023 05:57:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235037AbjDFJ5U (ORCPT ); Thu, 6 Apr 2023 05:57:20 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF771213B; Thu, 6 Apr 2023 02:55:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=YxhRL3yiAbFaoSIURbLJJRHKJGjYXkeVxmnQ/pEnBmY=; b=jGkaZVBOG3JXDwyQnR5K3g7hz/ 2ptks3zFH6B32uTi1CJ187m0NUIOvTwd4CvbInPMwVIBAPC+p2DKBfy/J2kLaA/fxIEf0a0HR4Mfs FxgSqwl17h+5IdMBqA0/qX5e6Y7epVv5hRgeFOvyVHmfodi3Cii3INJTSk1Nv1uZ7L7hZkqvyLD4J 4ehW5fGpIMn3gvJkcfDEB1qAy/Xgwrn+wwKGDl1s7fcnsJVGImxEUmrUWAotaLMgyE9OFK2Yyre4G eiSXzS/tsczaroxHZ9QV16yIcr5pxeB1fIBzpIhoHTT+ra48irTEDlcBncZDNBXA0vVpfckFTAsfB oMqihneg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1pkML1-00AUXC-1c; Thu, 06 Apr 2023 09:55:27 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 20E2F30008D; Thu, 6 Apr 2023 11:55:20 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 04F7520B6A7D6; Thu, 6 Apr 2023 11:55:19 +0200 (CEST) Date: Thu, 6 Apr 2023 11:55:19 +0200 From: Peter Zijlstra To: Leonardo Bras Cc: Steven Rostedt , Masami Hiramatsu , Thomas Gleixner , Yury Norov , "Paul E. McKenney" , Sebastian Andrzej Siewior , Nadav Amit , Zhen Lei , Chen Zhongjin , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Marcelo Tosatti Subject: Re: [RFC PATCH 1/1] smp: Add tracepoints for functions called with smp_call_function*() Message-ID: <20230406095519.GG386572@hirez.programming.kicks-ass.net> References: <20230406075718.68672-1-leobras@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230406075718.68672-1-leobras@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 06, 2023 at 04:57:18AM -0300, Leonardo Bras wrote: > When running RT workloads in isolated CPUs, many cases of deadline misses > are caused by remote CPU requests such as smp_call_function*(). > > For those cases, having the names of those functions running around the > deadline miss moment could help finding a target for the next improvements. > > Add tracepoints for acquiring the funtion name & argument before entry and > after exitting the called function. > > Signed-off-by: Leonardo Bras How are the patches queued there not sufficient? https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=smp/core