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 52533C433FE for ; Tue, 1 Mar 2022 11:31:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234553AbiCALbz (ORCPT ); Tue, 1 Mar 2022 06:31:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40286 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234543AbiCALbw (ORCPT ); Tue, 1 Mar 2022 06:31:52 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3193747387 for ; Tue, 1 Mar 2022 03:31:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646134269; 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; bh=FhZIq0cUe7PI3nHZJuPT6uvJTfMSZT0a6B5JQEBbb6w=; b=guVujwRPacsayKhm0hPhg40pB43M+WqWLUQEOn9VpUo/jpkL6Zqf6Jmo7rRuqVOsLnId0C sYHHHW2eTpfyw26gQykWKiLy9UThIbi/vwYhl9yF5bvb/Zc9Dywlv0jgGS2Eh1qqTlSMB2 TjZPfCy2S6fhshTbp4n1JEcptQLrzUQ= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-398-gKA1UPrDMgyrB3qruPRrrQ-1; Tue, 01 Mar 2022 06:31:08 -0500 X-MC-Unique: gKA1UPrDMgyrB3qruPRrrQ-1 Received: by mail-wr1-f69.google.com with SMTP id f11-20020a5d664b000000b001ef8a2c2e1fso1964616wrw.15 for ; Tue, 01 Mar 2022 03:31:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=FhZIq0cUe7PI3nHZJuPT6uvJTfMSZT0a6B5JQEBbb6w=; b=dn47UXUwKmwHP5RlB+HamzOfBA3VQIWnJRdzHlgsv5niE5UMcU46jrfO0utaIL58R/ YMihLB8sjRF6QlnGErRw1DiPGK4qxFrzeocUAQPN+99S2E71kdNLAyxCF5k09Oybos2+ Tb40lo08bTm0y0sCiEUfCwcidN+GYVsog9+go5nwgX9BGeT7Q7ZO+OREil1uuLRqjVLt UZs0vyzRl6g0j0c5f454/7Lzp7vFXNq2r+K4f3q5H6tCi/+Jp2W2OpAE0rSYKJampkNT kx9zxvzqLSnwy6zTw+hF/tjZnzMQCveBVQJ8Jt3iA2SQUeSWwhi+cAoShqyO6GWKav1R pcnQ== X-Gm-Message-State: AOAM533r7JgdLP8wxQuW2C8xY68EKIgqEdkEzYbela2NuXCkhS6D+L6t gkYlyArvyToE+MVN4y4ZAhjYs0GxNlQKfIMzbivig4g8hnVLGsMaDDDpRjuGiwmLtwBAzvto5KW r4njHjQ5kjzw9N6trHs9fCvIp X-Received: by 2002:a05:600c:1552:b0:381:c7ac:84b1 with SMTP id f18-20020a05600c155200b00381c7ac84b1mr1502885wmg.77.1646134267162; Tue, 01 Mar 2022 03:31:07 -0800 (PST) X-Google-Smtp-Source: ABdhPJxk0z3Pv6z2c6ioiWELKws6oQKlsEAm4niMEjqa/O7ULG8M+QFqH2yF1wTn6iJl4y1zzvlGuw== X-Received: by 2002:a05:600c:1552:b0:381:c7ac:84b1 with SMTP id f18-20020a05600c155200b00381c7ac84b1mr1502870wmg.77.1646134266915; Tue, 01 Mar 2022 03:31:06 -0800 (PST) Received: from vian.redhat.com ([2a0c:5a80:1b14:b500:abb:f9d1:7bc2:3db8]) by smtp.gmail.com with ESMTPSA id l6-20020adfa386000000b001ede14dcd74sm13609131wrb.104.2022.03.01.03.31.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Mar 2022 03:31:06 -0800 (PST) From: Nicolas Saenz Julienne To: mingo@redhat.com, peterz@infradead.org, frederic@kernel.org, rostedt@goodmis.org Cc: tglx@linutronix.de, mtosatti@redhat.com, bristot@redhat.com, linux-kernel@vger.kernel.org, Nicolas Saenz Julienne Subject: [PATCH v2 1/2] sched/isolation: use raw_smp_processor_id() in housekeeping_any_cpu() Date: Tue, 1 Mar 2022 12:30:52 +0100 Message-Id: <20220301113053.141514-1-nsaenzju@redhat.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org housekeeping_any_cpu() will return a housekeeping CPU. That's it. It'll try to optimize for NUMA locality and to use the local CPU, but it's not a requisite. So let's use raw_smp_processor_id() instead of its vanilla counterpart in order to allow users to query for housekeeping CPUs without having to disable preemption. Signed-off-by: Nicolas Saenz Julienne --- include/linux/sched/isolation.h | 2 +- kernel/sched/isolation.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index 8c15abd67aed..0c09ff1e4599 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -31,7 +31,7 @@ extern void __init housekeeping_init(void); static inline int housekeeping_any_cpu(enum hk_type type) { - return smp_processor_id(); + return raw_smp_processor_id(); } static inline const struct cpumask *housekeeping_cpumask(enum hk_type type) diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index b4d10815c45a..c2c1f6d8bb5f 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -43,14 +43,14 @@ int housekeeping_any_cpu(enum hk_type type) if (static_branch_unlikely(&housekeeping_overridden)) { if (housekeeping.flags & BIT(type)) { - cpu = sched_numa_find_closest(housekeeping.cpumasks[type], smp_processor_id()); + cpu = sched_numa_find_closest(housekeeping.cpumasks[type], raw_smp_processor_id()); if (cpu < nr_cpu_ids) return cpu; return cpumask_any_and(housekeeping.cpumasks[type], cpu_online_mask); } } - return smp_processor_id(); + return raw_smp_processor_id(); } EXPORT_SYMBOL_GPL(housekeeping_any_cpu); -- 2.35.1