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 X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26D3EC433DF for ; Wed, 17 Jun 2020 11:12:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ED5FB20CC7 for ; Wed, 17 Jun 2020 11:12:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DeMSlcVI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726541AbgFQLMm (ORCPT ); Wed, 17 Jun 2020 07:12:42 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:57100 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725860AbgFQLMm (ORCPT ); Wed, 17 Jun 2020 07:12:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592392361; 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=1dVj8I9a65xBLj259xh4rs3uh9pBlFndgvotOH6f5zo=; b=DeMSlcVIcrCcUM1hi6buwHunwHvSHr8CpT848eZUiUNbQNmPituw5Jt8lRdbyK3jWXcxDt oKV2I5DcfHalpv1XZnaZttI/0tTAKpFsUcawRcWzvsZxe1cij9hEicRTz0CeexrohTNmZw bQBxTPqMRckPcMpqvV+/RN1oZr1QZ28= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-4-3Tkh9aVBOOORA40r7OSNxA-1; Wed, 17 Jun 2020 07:12:37 -0400 X-MC-Unique: 3Tkh9aVBOOORA40r7OSNxA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4DF15100961C; Wed, 17 Jun 2020 11:12:36 +0000 (UTC) Received: from fuller.cnet (ovpn-112-4.gru2.redhat.com [10.97.112.4]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 62E0678EE1; Wed, 17 Jun 2020 11:12:33 +0000 (UTC) Received: by fuller.cnet (Postfix, from userid 1000) id C96C341887FC; Wed, 17 Jun 2020 07:12:12 -0300 (-03) Date: Wed, 17 Jun 2020 07:12:12 -0300 From: Marcelo Tosatti To: Sebastian Andrzej Siewior Cc: linux-rt-users@vger.kernel.org, Juri Lelli , Thomas Gleixner , Frederic Weisbecker Subject: Re: [patch 2/2] mm: page_alloc: drain pages remotely Message-ID: <20200617101212.GB392445@fuller.cnet> References: <20200616161149.392213902@fuller.cnet> <20200616161409.299575008@fuller.cnet> <20200616163248.z5bdrx7gj2sf7d3m@linutronix.de> <20200616170425.GA324900@fuller.cnet> <20200617074617.p4m5l5uu5urmagsc@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200617074617.p4m5l5uu5urmagsc@linutronix.de> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On Wed, Jun 17, 2020 at 09:46:17AM +0200, Sebastian Andrzej Siewior wrote: > On 2020-06-16 14:04:25 [-0300], Marcelo Tosatti wrote: > > It is affected. The workqueue thread for a given CPU is SCHED_OTHER, which can't > > interrupt a SCHED_FIFO task which does not sleep. > > Okay. So it is a problem which exists independently of -RT. > As I pointed out to Juri, vmstat_update() should have the very same > problem, correct? Yes.