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 A2D0BC433FE for ; Tue, 22 Nov 2022 20:28:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234909AbiKVU2u (ORCPT ); Tue, 22 Nov 2022 15:28:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234546AbiKVU2R (ORCPT ); Tue, 22 Nov 2022 15:28:17 -0500 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8DAD515805 for ; Tue, 22 Nov 2022 12:28:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1669148896; x=1700684896; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=jiYnvM57QdQau/H42shFzT9M5SGTODsNBjdPxNUJhmI=; b=NKkxiZ5Fji9Mkd6TVOXWtDrKNQtE8xJFI7uZ6aSxJFzMgHhILdr0ssmV r5ep01bB53BDuAEVNBvek40Lsgc/1t53rkw4UyJay949WgIc9kRau3h2/ yAPe2fA3H8F1eNzGMTb3v6q0i/PtPLYeqhX3EKw0azbWMt9lakzI2JFP+ 0za1zHOj8Qb/eQwJJumNo3w7VaqG3koknHzmLvOhp7uvbnY+u/awOkiAW cblmNU1rCO7pJAhb//e/iwl17pqffbyr4gghdJ0mWabcLNr88942yt6kS zOr3zB5oeAV8TCcZwTAW7KnTL/CN3WSYIRoqj0teW/MWe3NfCI+YHJuoI w==; X-IronPort-AV: E=McAfee;i="6500,9779,10539"; a="293616515" X-IronPort-AV: E=Sophos;i="5.96,185,1665471600"; d="scan'208";a="293616515" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Nov 2022 12:28:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10539"; a="816228147" X-IronPort-AV: E=Sophos;i="5.96,185,1665471600"; d="scan'208";a="816228147" Received: from ranerica-svr.sc.intel.com ([172.25.110.23]) by orsmga005.jf.intel.com with ESMTP; 22 Nov 2022 12:28:15 -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 , x86@kernel.org, linux-kernel@vger.kernel.org, Ricardo Neri , "Tim C . Chen" Subject: [PATCH v2 7/7] x86/sched/itmt: Consider the idle state of SMT siblings Date: Tue, 22 Nov 2022 12:35:32 -0800 Message-Id: <20221122203532.15013-8-ricardo.neri-calderon@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221122203532.15013-1-ricardo.neri-calderon@linux.intel.com> References: <20221122203532.15013-1-ricardo.neri-calderon@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Cores with more than one busy SMT sibling need help from fully idle cores, even if they have lower priority. Return a priority of 0 if any of the SMT siblings of a CPU are busy. This lets lower-priority idle cores pull tasks from the CPU. Only do this if the scheduler cares about the idle state of the siblings. Cc: Ben Segall Cc: Daniel Bristot de Oliveira Cc: Dietmar Eggemann Cc: Len Brown 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-kernel@vger.kernel.org Signed-off-by: Ricardo Neri --- Changes since v1: * Introduced this patch. --- arch/x86/kernel/itmt.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c index 2be49ce4f94a..cb22944969a1 100644 --- a/arch/x86/kernel/itmt.c +++ b/arch/x86/kernel/itmt.c @@ -169,7 +169,10 @@ void sched_clear_itmt_support(void) int arch_asym_cpu_priority(int cpu, bool check_smt) { - return per_cpu(sched_core_priority, cpu); + if (!check_smt || sched_smt_siblings_idle(cpu)) + return per_cpu(sched_core_priority, cpu); + + return 0; } /** -- 2.25.1