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 D10FC1BC095 for ; Thu, 20 Jun 2024 18:34:17 +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=1718908459; cv=none; b=uPx5AhGzhONbWfu/CciZ0TQwAh05MOnXhAa1ZV47QHmzQtpbkngpMRmNqWu+J+WN489wE++kA0koUtgjNSQ84CcPCEflIljN+f1AiGDPcUfNboxjFBF62EBzAYBwlwiilk5hU74IMUPER4h8LuZQY+hosFeB+/Obx9mexww+enU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718908459; c=relaxed/simple; bh=SLTcb+k51rqswflzWg3ZbykIc839nIpu4j+u+uc48KA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Daa+uUftvc53NVFN231BRuHPZHi8EQ1it6HkGBsOj0LtRZ9X66QzXRet2AzmsnYauYEOjblY4ExgCwgXmPjUaSiZYY07BLFShKViPICvbPXvhE8tg4xYMldS0nqrayOl3+7yifJD80FBIxFjKenIogpEfXt8cTSuKt6FT5NS+4U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none 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=eLwx3Tgb; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none 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="eLwx3Tgb" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1718908456; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=lWGOZ5x9U68yB64FGPI0opjFJHzrTVmGdyjMtfdZyeU=; b=eLwx3TgbbEES5AeVsJRiQy99WRmpMqxN6Jvgo3gKSYAysHtGGeTNtjccv2OlKmNQ55FUFb maIslynnCTVms5iuPj+aoyqGDUHUUV5izrN0PSXqh0X9a+kVq2A0JXGHyUwJ2gFM8N+Pzp MWeOyM4jtn7umdffsIchQwFO8Fn3Hac= Received: from mx-prod-mc-04.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-668-CMeDcwWLP_GcYKQq1Ny3eA-1; Thu, 20 Jun 2024 14:34:15 -0400 X-MC-Unique: CMeDcwWLP_GcYKQq1Ny3eA-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B30081955D5B; Thu, 20 Jun 2024 18:34:13 +0000 (UTC) Received: from debarbos-thinkpadt14sgen2i.remote.csb (unknown [10.22.10.164]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 87F7B1956048; Thu, 20 Jun 2024 18:34:10 +0000 (UTC) Date: Thu, 20 Jun 2024 14:34:07 -0400 From: Derek Barbosa To: Andrew Halaney Cc: Sebastian Andrzej Siewior , john.ogness@linutronix.de, pmladek@suse.com, rostedt@goodmis.org, senozhatsky@chromium.org, linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org, williams@redhat.com, jlelli@redhat.com, lgoncalv@redhat.com, jwyatt@redhat.com, aubaker@redhat.com Subject: Re: [PATCH] prinkt/nbcon: Add a scheduling point to nbcon_kthread_func(). Message-ID: References: <20240620071545.Es9LoyJY@linutronix.de> <20240620093246.HE9XDWSZ@linutronix.de> <20240620094300.YJlW043f@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 On Thu, Jun 20, 2024 at 12:18:37PM -0500, Andrew Halaney wrote: > Acked-by: Andrew Halaney > Tested-by: Andrew Halaney > > This survived a bunch of tests that normally would cause some lockups > etc in PREEMPT_VOLUNTARY systems. I can see that the nbcon thread successfully > migrated NUMA nodes etc during periods of overwhelming the console backlog > successfully, which without this would not work prior. > > Thanks! I'm going to second Andrew's observed results here. With the original reproducer of calling LTP pty03 && pty06 in a while loop, plus invoking stress-ng with --timeout 60000s && --numa 64, there were no problems with the nbcon thread migrating NUMA nodes and no panic(s) with kernel.softlockup_panic = 1 This was observed on an nproc == 128 machine. Thanks! :-) Acked-by: Derek Barbosa Tested-by: Derek Barbosa