From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 6111B27A104 for ; Thu, 8 May 2025 14:54:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746716070; cv=none; b=ojuipa1Y2PD5GaWRJJAwm7gHodz8mxaalKyo9gut0fjXc9rUwsjJ9V1WTZTgVHFeQ02uzexdiXAkDeUUIycSasIKcfGaG10qeFdiVZ1OU7mV3rQ1fS1yA1fl/U/Wjs3XEmEzuHcrBfBbLXkg41KsFxEcNRfz4fV2uGTbupyhQMs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746716070; c=relaxed/simple; bh=oJfC6o5m5P1YisWX5sseAY5o4KMr7ZyiAPQCb8q6T/E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tHstjnGvwo1wYsuL3Flr8bKiMNF6ed6WiEmHvAXUsgdBVMfZhVEn91Y4RaVxnB/hsemVxcfEw/l92S+q+fqhA+gIWKRqTuHQ9PAj5k/ViUpNCEPlJTeNFtNcBvkZV8FZiGzZ5trHpfi9jWCZUxromQvhyRgFEGW4JJ/e/y9PkII= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=YxID7ztD; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="YxID7ztD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1746716067; 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: in-reply-to:in-reply-to:references:references; bh=7DBUr7Tsi3ZK47KS1wKN6MpKnbFEHSyvqrNjk76TULQ=; b=YxID7ztDziXx7IJ1ufiuchUl0Kia61FnyAYPX19XuXUestMlvUXDkx73sZl1wzi4mBnBRy nr+GWh+dhNGBtqdEOUH5jgizGqTPGYGadSNiHPpaXeWAnJZLclw74inxkTs5VAGeDN0XLH ndf8wFumIGhK7PlklumV3XCjjlnpjXs= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-574-mY3nk5uxOEOgT57dFJsxqg-1; Thu, 08 May 2025 10:54:26 -0400 X-MC-Unique: mY3nk5uxOEOgT57dFJsxqg-1 X-Mimecast-MFC-AGG-ID: mY3nk5uxOEOgT57dFJsxqg_1746716065 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5FAA41955D96; Thu, 8 May 2025 14:54:25 +0000 (UTC) Received: from gmonaco-thinkpadt14gen3.rmtit.com (unknown [10.44.32.32]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D277E19560B3; Thu, 8 May 2025 14:54:22 +0000 (UTC) From: Gabriele Monaco To: linux-kernel@vger.kernel.org, Frederic Weisbecker , Thomas Gleixner , Waiman Long Cc: Gabriele Monaco Subject: [PATCH v5 2/6] timers: Add the available mask in timer migration Date: Thu, 8 May 2025 16:53:22 +0200 Message-ID: <20250508145319.97794-10-gmonaco@redhat.com> In-Reply-To: <20250508145319.97794-8-gmonaco@redhat.com> References: <20250508145319.97794-8-gmonaco@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Keep track of the CPUs available for timer migration in a cpumask. This prepares the ground to generalise the concept of unavailable CPUs. Signed-off-by: Gabriele Monaco --- kernel/time/timer_migration.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c index 7efd897c7959..25439f961ccf 100644 --- a/kernel/time/timer_migration.c +++ b/kernel/time/timer_migration.c @@ -422,6 +422,9 @@ static unsigned int tmigr_crossnode_level __read_mostly; static DEFINE_PER_CPU(struct tmigr_cpu, tmigr_cpu); +/* CPUs available for timer migration */ +static cpumask_var_t tmigr_available_cpumask; + #define TMIGR_NONE 0xFF #define BIT_CNT 8 @@ -1449,6 +1452,7 @@ static int tmigr_cpu_unavailable(unsigned int cpu) raw_spin_lock_irq(&tmc->lock); tmc->available = false; WRITE_ONCE(tmc->wakeup, KTIME_MAX); + cpumask_clear_cpu(cpu, tmigr_available_cpumask); /* * CPU has to handle the local events on his own, when on the way to @@ -1459,7 +1463,7 @@ static int tmigr_cpu_unavailable(unsigned int cpu) raw_spin_unlock_irq(&tmc->lock); if (firstexp != KTIME_MAX) { - migrator = cpumask_any_but(cpu_online_mask, cpu); + migrator = cpumask_any(tmigr_available_cpumask); work_on_cpu(migrator, tmigr_trigger_active, NULL); } @@ -1480,6 +1484,7 @@ static int tmigr_cpu_available(unsigned int cpu) if (!tmc->idle) __tmigr_cpu_activate(tmc); tmc->available = true; + cpumask_set_cpu(cpu, tmigr_available_cpumask); raw_spin_unlock_irq(&tmc->lock); return 0; } @@ -1801,6 +1806,11 @@ static int __init tmigr_init(void) if (ncpus == 1) return 0; + if (!zalloc_cpumask_var(&tmigr_available_cpumask, GFP_KERNEL)) { + ret = -ENOMEM; + goto err; + } + /* * Calculate the required hierarchy levels. Unfortunately there is no * reliable information available, unless all possible CPUs have been -- 2.49.0