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 D0E37C433F5 for ; Tue, 22 Mar 2022 11:57:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234454AbiCVL7M (ORCPT ); Tue, 22 Mar 2022 07:59:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57066 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229484AbiCVL7L (ORCPT ); Tue, 22 Mar 2022 07:59:11 -0400 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1D2F323BE0 for ; Tue, 22 Mar 2022 04:57:44 -0700 (PDT) Received: by mail-wm1-x32a.google.com with SMTP id h16so10050102wmd.0 for ; Tue, 22 Mar 2022 04:57:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=hLtfvRdZCZE7DrPVlS8YfsRhGZmzIPo7skcuEYSO4hw=; b=j+9e3zTSe7YMjvusq8VyhZY8Obm1Kcc84Veo/LfnBMvLWNPygsyrEsf+RY0OIJLaFq 2qrQXWhRsxbJStpyY1JXXNOpzqUs4y9+tbRNniXopvJSP4ZIKD4g4f/mg/fQV7uzARsQ A6biV9wAj972M4YbMUVyHjZNliIG5QZI2oZNIGMV1waqfp2D5sNp1G5is4pS3hDHy0Wv Ch/lV6rhzQxdqpDjOdf9zM3vMdVZuN29JoaNmAnD9i8HYWK/gYQHuBM+xRk9M84sLOK+ 18oShMvbAI6J+YyNyMl4sFCFFVIzwl9a0MxmOjckbFGduxwz2vGqZuARwkxYRyZ1YqB9 0u3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=hLtfvRdZCZE7DrPVlS8YfsRhGZmzIPo7skcuEYSO4hw=; b=a0iFpW4JuZpyA4smzgsHU+GE7sLLXFyBfHaeAxv+VFy+03ue4nob5b9LchwSKwPe+S fRTKzpW/NQogPTn5jQBuRHYNxB88pTrF7r1VFDnXdLRbNsCLC/NgVvM/ZrcGNJ6afE5p mG3/ZS+GRPga9a+k5IVsTaYiQlK658xpXpd43iG5kEArCoK62J7VwgXKnWrc6uD4LKsp xuI0gdpFMa4AdZdhmsFUP9ofeZcI2ZhuBxcl7YhcQ6D0b64yU+cPMHIbJndF7jxd179z UgM+vV1mgKyjPWHXwSqZwxqSi63CeS5gMf+YAR0+n4QBW7MGurnkkU/MPg3jluqKG0eH S/3A== X-Gm-Message-State: AOAM530p7ep5/up1VtQPYL/u5UKVM157AOdUOrlWU3VftSPcJZcd4TNZ cQHdUrdJxl08ZdQCB30icDvmlg== X-Google-Smtp-Source: ABdhPJyNqqUErWG52sDeu7pVzR3d0PgnXUIIgLZtllrYMoG+RJX1I7Iq+B2wvNyxlO0RIJXxVMt8TQ== X-Received: by 2002:a05:600c:3b86:b0:38c:afdf:66cd with SMTP id n6-20020a05600c3b8600b0038cafdf66cdmr3361285wms.198.1647950262573; Tue, 22 Mar 2022 04:57:42 -0700 (PDT) Received: from google.com (110.121.148.146.bc.googleusercontent.com. [146.148.121.110]) by smtp.gmail.com with ESMTPSA id w5-20020a5d5445000000b00203f8c96bcesm9981236wrv.49.2022.03.22.04.57.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Mar 2022 04:57:41 -0700 (PDT) Date: Tue, 22 Mar 2022 12:57:38 +0100 From: "Steinar H. Gunderson" To: Adrian Hunter Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Alexander Shishkin , Jiri Olsa , Namhyung Kim , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] perf intel-pt: Synthesize cycle events Message-ID: References: <52903e58-e74c-5ea0-36b4-277ea3610af4@intel.com> <371faf0d-f794-4a2e-0a1c-9d454d7c8b12@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 21, 2022 at 05:58:08PM +0100, Steinar H. Gunderson wrote: > but I'm seeing problems with “failing to process sample” when I go from > 10us to 1us, so I'll have to look into that. I took a debug log from perf report; the last few lines are (I abridged some symbol names): symbol__new: cppgc::internal::MemberBase::GetRaw() const 0x6078a90-0x60792d0 symbol__new: cppgc::internal::BasicMember<...>::Get() const 0x6078a90-0x60792d0 symbol__new: cppgc::internal::BasicMember<...>::operator->() const 0x6078a90-0x60792d0 __symbol__inc_addr_samples: addr=0x5561dc37cbf6 __symbol__inc_addr_samples(896): ERANGE! sym->name=void blink::ElementRuleCollector::CollectMatchingRulesForList<...>(...), start=0x6074310, addr=0x6078bf6, end=0x6078a90 problem adding hist entry, skipping event Intel PT: failed to deliver event, error -34 0x5739a8 [0x8]: failed to process type: 68 [Numerical result out of range] and this is evidently fatal. So for whatever reason, the sample address is attributed to some symbol, and that symbol is assumed to have a single range (is this even necessarily true?), we refuse the event, and then we fail the entire report. (It doesn't happen with --stdio, though!) I'm a bit at a loss how to debug this. It doesn't happen without the inlines being synthesized, but I don't know if there's something wrong with it, or if it's just the symptom (I've certainly seen “failed to process sample” without PT before). /* Steinar */