From patchwork Wed Aug 14 17:01:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artem Bityutskiy X-Patchwork-Id: 11094245 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 969256C5 for ; Wed, 14 Aug 2019 17:02:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 83DA028682 for ; Wed, 14 Aug 2019 17:02:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7882D2877E; Wed, 14 Aug 2019 17:02:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 18BF728682 for ; Wed, 14 Aug 2019 17:02:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728233AbfHNRCD (ORCPT ); Wed, 14 Aug 2019 13:02:03 -0400 Received: from mga06.intel.com ([134.134.136.31]:43794 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726804AbfHNRCD (ORCPT ); Wed, 14 Aug 2019 13:02:03 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Aug 2019 10:02:03 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,386,1559545200"; d="scan'208";a="376112591" Received: from powerlab.fi.intel.com (HELO powerlab.backendnet) ([10.237.71.25]) by fmsmga005.fm.intel.com with ESMTP; 14 Aug 2019 10:02:02 -0700 From: Artem Bityutskiy To: Len Brown Cc: Linux PM Mailing List , Artem Bityutskiy Subject: [PATCH 2/2] tools/power turbostat: do not enforce 1ms Date: Wed, 14 Aug 2019 20:01:59 +0300 Message-Id: <20190814170159.42952-2-dedekind1@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190814170159.42952-1-dedekind1@gmail.com> References: <20190814170159.42952-1-dedekind1@gmail.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Artem Bityutskiy Turbostat works by taking a snapshot of counters, sleeping, taking another snapshot, calculating deltas, and printing out the table. The sleep time is controlled via -i option or by user sending a signal or a character to stdin. In the latter case, turbostat always adds 1 ms sleep before it reads the counters, in order to avoid larger imprecisions in the results in prints. While the 1 ms delay may be a good idea for a "dumb" user, it is a problem for an "aware" user. I do thousands and thousands of measurements over a short period of time (like 2ms), and turbostat unconditionally adds a 1ms to my interval, so I cannot get what I really need. This patch removes the unconditional 1ms sleep. This is an expert user tool, after all, and non-experts will unlikely ever use it in the non-fixed interval mode anyway, so I think it is OK to remove the 1ms delay. Change-Id: Id2075036e7e2c682b34c9597d2dade13ea28acf6 Signed-off-by: Artem Bityutskiy --- tools/power/x86/turbostat/turbostat.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 573230a774cd..57e236187cdb 100644 --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -39,7 +39,6 @@ FILE *outf; int *fd_percpu; struct timeval interval_tv = {5, 0}; struct timespec interval_ts = {5, 0}; -struct timespec one_msec = {0, 1000000}; unsigned int num_iterations; unsigned int debug; unsigned int quiet; @@ -2986,8 +2985,6 @@ static void signal_handler (int signal) fprintf(stderr, "SIGUSR1\n"); break; } - /* make sure this manually-invoked interval is at least 1ms long */ - nanosleep(&one_msec, NULL); } void setup_signal_handler(void) @@ -3038,8 +3035,6 @@ void do_sleep(void) rest.tv_nsec = (tout.tv_usec % 1000000) * 1000; nanosleep(&rest, NULL); } - /* make sure this manually-invoked interval is at least 1ms long */ - nanosleep(&one_msec, NULL); } }