From patchwork Tue Feb 7 05:10:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Neri X-Patchwork-Id: 13131038 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 B5A2FC636CD for ; Tue, 7 Feb 2023 05:02:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230388AbjBGFCy (ORCPT ); Tue, 7 Feb 2023 00:02:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60482 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230036AbjBGFB7 (ORCPT ); Tue, 7 Feb 2023 00:01:59 -0500 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C96BD52A; Mon, 6 Feb 2023 21:01:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1675746117; x=1707282117; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=JgRkYVFr3x01km8FwYfHaTTQU7Y65rdIHc+lrY4vxao=; b=KzWpAtfmumtSM1eYljIE9LJ+HZG/fiLSQ6asQ9NEnvVsdrO86a44bIfR ucZx3mq/QlB3WBkhbmbJFfi27J2EPn9boEGMkfRQZ2aP1JET4yecVEKcF TXVScFQ/duJxsTDlaZg54Yz1IRcUNo4RBOGaJn52atMXvwPR4gWe4boFi 8O6PoK6H8gm0RLERj2ekOd0QPboQV2P4/dHaMGC8QtCQrbKuZe5FC5ipM Ueq3+i+6BAARmBdj7z8FuckEOPwDz8MV4jndHw+TcXCta18DMYarnom1l NVybexqFUzS8wfsDcRZpCUoXncthXd+zRZPjYjjR4GgYE4WhgJL0GlhkA Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10613"; a="415625927" X-IronPort-AV: E=Sophos;i="5.97,278,1669104000"; d="scan'208";a="415625927" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Feb 2023 21:01:45 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10613"; a="668657762" X-IronPort-AV: E=Sophos;i="5.97,278,1669104000"; d="scan'208";a="668657762" Received: from ranerica-svr.sc.intel.com ([172.25.110.23]) by fmsmga007.fm.intel.com with ESMTP; 06 Feb 2023 21:01:45 -0800 From: Ricardo Neri To: "Peter Zijlstra (Intel)" , Juri Lelli , Vincent Guittot Cc: Ricardo Neri , "Ravi V. Shankar" , Ben Segall , Daniel Bristot de Oliveira , Dietmar Eggemann , Len Brown , Mel Gorman , "Rafael J. Wysocki" , Srinivas Pandruvada , Steven Rostedt , Tim Chen , Valentin Schneider , Lukasz Luba , Ionela Voinescu , x86@kernel.org, "Joel Fernandes (Google)" , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Ricardo Neri , "Tim C . Chen" Subject: [PATCH v3 18/24] sched/task_struct: Add helpers for IPC classification Date: Mon, 6 Feb 2023 21:10:59 -0800 Message-Id: <20230207051105.11575-19-ricardo.neri-calderon@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230207051105.11575-1-ricardo.neri-calderon@linux.intel.com> References: <20230207051105.11575-1-ricardo.neri-calderon@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The unprocessed classification that hardware provides for a task may not be usable by the scheduler: the classification may change too frequently or architectures may want to consider extra factors. For instance, some processors with Intel Thread Director need to consider the state of the SMT siblings of a core. Provide per-task helper variables that architectures can use to post- process the classification that hardware provides. Cc: Ben Segall Cc: Daniel Bristot de Oliveira Cc: Dietmar Eggemann Cc: Ionela Voinescu Cc: Joel Fernandes (Google) Cc: Len Brown Cc: Lukasz Luba Cc: Mel Gorman Cc: Rafael J. Wysocki Cc: Srinivas Pandruvada Cc: Steven Rostedt Cc: Tim C. Chen Cc: Valentin Schneider Cc: x86@kernel.org Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ricardo Neri --- Changes since v2: * None Changes since v1: * Used bit-fields to fit all the IPC class data in 4 bytes. (PeterZ) * Shortened names of the helpers. * Renamed helpers with the ipcc_ prefix. * Reworded commit message for clarity --- include/linux/sched.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 10c6abdc3465..45f28a601b3d 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1535,7 +1535,17 @@ struct task_struct { * A hardware-defined classification of task that reflects but is * not identical to the number of instructions per cycle. */ - unsigned short ipcc; + unsigned int ipcc : 9; + /* + * A candidate classification that arch-specific implementations + * qualify for correctness. + */ + unsigned int ipcc_tmp : 9; + /* + * Counter to filter out transient candidate classifications + * of a task. + */ + unsigned int ipcc_cntr : 14; #endif /*