From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E950135292E; Wed, 24 Dec 2025 13:48:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766584121; cv=none; b=DsA05o6zieWRbDDvYFo39idQexOso6jwidw4XrGsHS5GEz30L3ajSSiFBKyRcajmN3ukuZ/0mqlSVRZjL+spDkVKYAvLCHtIXm8fs8YvAt5AqtpPa4Cn8ui4lRPzIeLomHl9OTiyYKYU/Z8jmxDFkNWjm+v6Xt0lk7Jg4ja60cs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766584121; c=relaxed/simple; bh=Vd5zEgAm2uI/g+D2ywWrAdEOzwZScM14UO5N/4sNoXM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XVo3mK/8/k2fYuM2PkycJBH5jycWbMp5tTrUxDdr8D0EiqmyOXTdkA9LT6w/Afz0sLZnCIJL5dIrIeVZ92bfOCpSZKyBMEB3IpwJiCT6P+kkY27WGM/M05HnOTVWLs9/WS4CqjxIIl4oygxj8BwKsMrUIjr7B1hLJ60QEHrskJA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Jiua12K4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Jiua12K4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE94DC116D0; Wed, 24 Dec 2025 13:48:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766584120; bh=Vd5zEgAm2uI/g+D2ywWrAdEOzwZScM14UO5N/4sNoXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Jiua12K4SprWh9L6H5HuFhCgLnOWGrMamurnMP0iGv6lVyZzVfsdZpVsgY5pAFARd zOkTEQXKgkY1l6oL0MKegz02DeSR4WDHP9J1nzugmwToT45MZOMwSQNQMv9ZOmhpdx BwmuatxKKh3I/JsIsABaiRNUp/mqAT58h/lgQ0L3007InYiU/2OYfVV7RkokDkFfDx emhqVW/4R7HT4Dq6UpXspH0tXVZq89SkAW2TKLbmb38xtrOhPvwKKMRG2lmJDRoU3V yNoIRcFSKEOW2mZt4rX1VAMTCuy9TZV8GFcYgxlTrZkn6IV8vdKKcLAHMwltvKX3pw zlG+rYwvcWtFg== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Chen Ridong , Danilo Krummrich , "David S . Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 22/33] sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated() Date: Wed, 24 Dec 2025 14:45:09 +0100 Message-ID: <20251224134520.33231-23-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit It doesn't make sense to use nohz_full without also isolating the related CPUs from the domain topology, either through the use of isolcpus= or cpuset isolated partitions. And now HK_TYPE_DOMAIN includes all kinds of domain isolated CPUs. This means that HK_TYPE_KERNEL_NOISE (of which HK_TYPE_TICK is only an alias) should always be a subset of HK_TYPE_DOMAIN. Therefore if a CPU is not HK_TYPE_DOMAIN, it shouldn't be HK_TYPE_KERNEL_NOISE either. Testing the former is then enough. Simplify cpu_is_isolated() accordingly. Signed-off-by: Frederic Weisbecker --- include/linux/sched/isolation.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index 19905adbb705..cbb1d30f699a 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -82,8 +82,7 @@ static inline bool housekeeping_cpu(int cpu, enum hk_type type) static inline bool cpu_is_isolated(int cpu) { - return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) || - !housekeeping_test_cpu(cpu, HK_TYPE_TICK); + return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN); } #endif /* _LINUX_SCHED_ISOLATION_H */ -- 2.51.1