From patchwork Thu Aug 15 14:05:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomas Glozar X-Patchwork-Id: 13764824 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 966571BBBF1 for ; Thu, 15 Aug 2024 14:06:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723730779; cv=none; b=Zk0t0gO4U87OMm/1zK2qgsiO6AN04hJL7BaFIk5TjciKLVizrXW/1rJO1+CfSnvQs6p+BVVr1alqMxi/KIJdYnjyAg0UKLozK+taVwQoF2VqPsNiW4WH7XeYPvzBteixGCpFrskq9RWmCvDJsUGuzP3Sht8kcM7W5EEnjnOrdEk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723730779; c=relaxed/simple; bh=H7WErtPx98g50HeQGgJAKtGxCib4b7+et9HBobPZvQg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lB+BsARbc29Tv8GHttmfRdzjzxL4dU3PRr5iEpAfdApk38gVEHkfAF3Cph6pgkP8cvHZIZO7dSmuBZ6vUh1TaaXEZkTAQ0+OUtQjLwfbcXJnflXYBre5NzGq1TJjBjpyz/hjc4r2Wt9dUuU1N8KkNGqT11ensx7qJbtE7cPtZ3c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Jxniz7zB; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Jxniz7zB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1723730776; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=edQ2M6VPUkv8UnlnheoaG2wqdLDckwsm4zi2AilNIlw=; b=Jxniz7zB5DZKocM5zW5deMpyqqb2rkl+9CRqaMPa5abwFk3Js9O+lAFXx8sonMU3LRU3QZ UnamWTIRHiXdV6PeZgeP3iBQskf8vYl5XnZWcHEVOg0UwcJArHkUQXYPGlWrCAk5GBqhpH QgZ5p8bzwHlx0fmvbvQN7fEcj6ovEfE= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-547-q8b-g80MPPG5Lpg3X6-82A-1; Thu, 15 Aug 2024 10:06:14 -0400 X-MC-Unique: q8b-g80MPPG5Lpg3X6-82A-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4BFE61954B19; Thu, 15 Aug 2024 14:06:13 +0000 (UTC) Received: from fedora.brq.redhat.com (unknown [10.43.17.68]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 52127300019C; Thu, 15 Aug 2024 14:06:10 +0000 (UTC) From: tglozar@redhat.com To: rostedt@goodmis.org Cc: linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, jwyatt@redhat.com, jkacur@redhat.com, Tomas Glozar Subject: [PATCH v3 5/6] rtla/timerlat: Add --deepest-idle-state for hist Date: Thu, 15 Aug 2024 16:05:08 +0200 Message-ID: <20240815140509.12468-6-tglozar@redhat.com> In-Reply-To: <20240815140509.12468-1-tglozar@redhat.com> References: <20240815140509.12468-1-tglozar@redhat.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 From: Tomas Glozar Support limiting deepest idle state also for timerlat-hist. Signed-off-by: Tomas Glozar --- tools/tracing/rtla/src/timerlat_hist.c | 42 +++++++++++++++++++++++++- 1 file changed, 41 insertions(+), 1 deletion(-) diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c index a3907c390d67..99176951c414 100644 --- a/tools/tracing/rtla/src/timerlat_hist.c +++ b/tools/tracing/rtla/src/timerlat_hist.c @@ -55,6 +55,7 @@ struct timerlat_hist_params { int entries; int warmup; int buffer_size; + int deepest_idle_state; }; struct timerlat_hist_cpu { @@ -655,7 +656,7 @@ static void timerlat_hist_usage(char *usage) " [-t[file]] [-e sys[:event]] [--filter ] [--trigger ] [-c cpu-list] [-H cpu-list]\\", " [-P priority] [-E N] [-b N] [--no-irq] [--no-thread] [--no-header] [--no-summary] \\", " [--no-index] [--with-zeros] [--dma-latency us] [-C[=cgroup_name]] [--no-aa] [--dump-task] [-u|-k]", - " [--warm-up s]", + " [--warm-up s] [--deepest-idle-state n]", "", " -h/--help: print this menu", " -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit", @@ -695,6 +696,7 @@ static void timerlat_hist_usage(char *usage) " -U/--user-load: enable timerlat for user-defined user-space workload", " --warm-up s: let the workload run for s seconds before collecting data", " --trace-buffer-size kB: set the per-cpu trace buffer size in kB", + " --deepest-idle-state n: only go down to idle state n on cpus used by timerlat to reduce exit from idle latency", NULL, }; @@ -732,6 +734,9 @@ static struct timerlat_hist_params /* disabled by default */ params->dma_latency = -1; + /* disabled by default */ + params->deepest_idle_state = -2; + /* display data in microseconds */ params->output_divisor = 1000; params->bucket_size = 1; @@ -772,6 +777,7 @@ static struct timerlat_hist_params {"dump-task", no_argument, 0, '\1'}, {"warm-up", required_argument, 0, '\2'}, {"trace-buffer-size", required_argument, 0, '\3'}, + {"deepest-idle-state", required_argument, 0, '\4'}, {0, 0, 0, 0} }; @@ -960,6 +966,9 @@ static struct timerlat_hist_params case '\3': params->buffer_size = get_llong_from_str(optarg); break; + case '\4': + params->deepest_idle_state = get_llong_from_str(optarg); + break; default: timerlat_hist_usage("Invalid option"); } @@ -1152,6 +1161,7 @@ int timerlat_hist_main(int argc, char *argv[]) int return_value = 1; pthread_t timerlat_u; int retval; + int nr_cpus, i; params = timerlat_hist_parse_args(argc, argv); if (!params) @@ -1201,6 +1211,28 @@ int timerlat_hist_main(int argc, char *argv[]) } } + if (params->deepest_idle_state >= -1) { + if (!have_libcpupower_support()) { + err_msg("rtla built without libcpupower, --deepest-idle-state is not supported\n"); + goto out_free; + } + + nr_cpus = sysconf(_SC_NPROCESSORS_CONF); + + for (i = 0; i < nr_cpus; i++) { + if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus)) + continue; + if (save_cpu_idle_disable_state(i) < 0) { + err_msg("Could not save cpu idle state.\n"); + goto out_free; + } + if (set_deepest_cpu_idle_state(i, params->deepest_idle_state) < 0) { + err_msg("Could not set deepest cpu idle state.\n"); + goto out_free; + } + } + } + if (params->trace_output) { record = osnoise_init_trace_tool("timerlat"); if (!record) { @@ -1332,6 +1364,13 @@ int timerlat_hist_main(int argc, char *argv[]) timerlat_aa_destroy(); if (dma_latency_fd >= 0) close(dma_latency_fd); + if (params->deepest_idle_state >= -1) { + for (i = 0; i < nr_cpus; i++) { + if (params->cpus && !CPU_ISSET(i, ¶ms->monitored_cpus)) + continue; + restore_cpu_idle_disable_state(i); + } + } trace_events_destroy(&record->trace, params->events); params->events = NULL; out_free: @@ -1340,6 +1379,7 @@ int timerlat_hist_main(int argc, char *argv[]) osnoise_destroy_tool(record); osnoise_destroy_tool(tool); free(params); + free_cpu_idle_disable_states(); out_exit: exit(return_value); }