From patchwork Thu Feb 8 11:31:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adrian Hunter X-Patchwork-Id: 13549670 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A290EC4828F for ; Thu, 8 Feb 2024 11:32:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=rj0H1shRdUnLsD27bpdu1ro4UzxSXtQZWnNnYGlnAb0=; b=vaNSL1X/Af3eSQ vAB8aAjz4bNVGOGJwrL9ifo2MWPRjUSf0SNfRikyzAo0e9wVod37aRDbrEyS4meigViq9y7orsMxy yNdy9NVMn4A9LwvP+mJG4mvGZgojQmiTo2b5f0l8Yt3YISXGUTqf4wRWYfazA5cXw4WTFTQm9SrPU TF6wjgn3rEJzHFEc6Ylc4lvrzL7/86wbsc1wQ3nN3Idf2yNktTXvzsB8WekecfG+O9ivMTkjFwJur S8K2cMW1GK+UoIPpigsGt2i+xdrOWjSI3bl99cyTPUoAGykIWJHVYu9ixOxt8W461+PpdNo5rTFuD yHZv+jeIIj3UJXglCyjA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rY2dF-0000000DZaA-2rt9; Thu, 08 Feb 2024 11:31:53 +0000 Received: from mgamail.intel.com ([192.198.163.15]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rY2dD-0000000DZYt-1Iim for linux-arm-kernel@lists.infradead.org; Thu, 08 Feb 2024 11:31:52 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1707391911; x=1738927911; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=+Lq1+Yjwc1/TnXA6RrghdQBok9enssN3fOFULsujD9Y=; b=dFBVCG5h/vBPKjksw7YqBPP/Js9Wpyp42Lf737N6C1s+Z8gceMx0vpdZ ZcRtWyGj1KPZqNM3E24jRieyHOz4/jv602vrKKFOHJIKH8hkyfRNbMOku lihzNaYfNi6tbOg21QLdXo6HElF4UNXsG5OF26NXJk2CB8uC81+F/pe5I BsIG5De+kTX9vh/R0Lp8uaoqXnSvch+dbVyB6w8CdLrlKPD201ru7WW6Q Dfq88qNd3o8NrkNUVCIfLxO32EiHgy9gBOZQm2TgtRtU/EoQOjyCk4Whw PrNZeYLYynYx700atWnuCsKktioNIG5lIOlSd2qyGjk8dIGt4erG/IRIX g==; X-IronPort-AV: E=McAfee;i="6600,9927,10977"; a="1345413" X-IronPort-AV: E=Sophos;i="6.05,253,1701158400"; d="scan'208";a="1345413" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2024 03:31:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,253,1701158400"; d="scan'208";a="1957417" Received: from ahunter6-mobl1.ger.corp.intel.com (HELO ahunter-VirtualBox.home\044ger.corp.intel.com) ([10.251.219.88]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Feb 2024 03:31:38 -0800 From: Adrian Hunter To: Peter Zijlstra Cc: Ingo Molnar , Mark Rutland , Alexander Shishkin , Heiko Carstens , Thomas Richter , Hendrik Brueckner , Suzuki K Poulose , Mike Leach , James Clark , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, Yicong Yang , Jonathan Cameron , Will Deacon , Arnaldo Carvalho de Melo , Jiri Olsa , Namhyung Kim , Ian Rogers , Andi Kleen , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH V5 00/12] perf/core: Add ability for an event to "pause" or "resume" AUX area tracing Date: Thu, 8 Feb 2024 13:31:15 +0200 Message-Id: <20240208113127.22216-1-adrian.hunter@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240208_033151_423666_32FF8CA2 X-CRM114-Status: GOOD ( 14.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Hardware traces, such as instruction traces, can produce a vast amount of trace data, so being able to reduce tracing to more specific circumstances can be useful. The ability to pause or resume tracing when another event happens, can do that. These patches add such a facilty and show how it would work for Intel Processor Trace. Maintainers of other AUX area tracing implementations are requested to consider if this is something they might employ and then whether or not the ABI would work for them. Note, thank you to James Clark (ARM) for evaluating the API for Coresight. Suzuki K Poulose (ARM) also responded positively to the RFC. Changes to perf tools are now (since V4) fleshed out. Changes in V5: perf/core: Add aux_pause, aux_resume, aux_start_paused Added James' Ack perf/x86/intel: Do not enable large PEBS for events with aux actions or aux sampling New patch perf tools Added Ian's Ack Changes in V4: perf/core: Add aux_pause, aux_resume, aux_start_paused Rename aux_output_cfg -> aux_action Reorder aux_action bits from: aux_pause, aux_resume, aux_start_paused to: aux_start_paused, aux_pause, aux_resume Fix aux_action bits __u64 -> __u32 coresight: Have a stab at support for pause / resume Dropped perf tools All new patches Changes in RFC V3: coresight: Have a stab at support for pause / resume 'mode' -> 'flags' so it at least compiles Changes in RFC V2: Use ->stop() / ->start() instead of ->pause_resume() Move aux_start_paused bit into aux_output_cfg Tighten up when Intel PT pause / resume is allowed Add an example of how it might work for CoreSight Adrian Hunter (12): perf/core: Add aux_pause, aux_resume, aux_start_paused perf/x86/intel/pt: Add support for pause / resume perf/x86/intel: Do not enable large PEBS for events with aux actions or aux sampling perf tools: Enable evsel__is_aux_event() to work for ARM/ARM64 perf tools: Enable evsel__is_aux_event() to work for S390_CPUMSF perf tools: Add aux_start_paused, aux_pause and aux_resume perf tools: Add aux-action config term perf tools: Parse aux-action perf tools: Add missing_features for aux_start_paused, aux_pause, aux_resume perf intel-pt: Improve man page format perf intel-pt: Add documentation for pause / resume perf intel-pt: Add a test for pause / resume arch/x86/events/intel/core.c | 10 +- arch/x86/events/intel/pt.c | 63 ++- arch/x86/events/intel/pt.h | 4 + include/linux/perf_event.h | 15 + include/uapi/linux/perf_event.h | 11 +- kernel/events/core.c | 72 +++- kernel/events/internal.h | 1 + tools/include/uapi/linux/perf_event.h | 11 +- tools/perf/Documentation/perf-intel-pt.txt | 596 ++++++++++++++++++----------- tools/perf/Documentation/perf-record.txt | 4 + tools/perf/arch/arm/util/pmu.c | 3 + tools/perf/builtin-record.c | 4 +- tools/perf/tests/shell/test_intel_pt.sh | 28 ++ tools/perf/util/auxtrace.c | 67 +++- tools/perf/util/auxtrace.h | 6 +- tools/perf/util/evsel.c | 13 +- tools/perf/util/evsel.h | 1 + tools/perf/util/evsel_config.h | 1 + tools/perf/util/parse-events.c | 10 + tools/perf/util/parse-events.h | 1 + tools/perf/util/parse-events.l | 1 + tools/perf/util/perf_event_attr_fprintf.c | 3 + tools/perf/util/pmu.c | 6 +- 23 files changed, 691 insertions(+), 240 deletions(-) Regards Adrian