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=-8.7 required=3.0 tests=BAYES_00,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=ham 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 EE1ABC07E96 for ; Tue, 6 Jul 2021 14:34:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CD3AD61C22 for ; Tue, 6 Jul 2021 14:34:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231864AbhGFOg6 (ORCPT ); Tue, 6 Jul 2021 10:36:58 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31902 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231569AbhGFOgn (ORCPT ); Tue, 6 Jul 2021 10:36:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1625582044; 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=YoXkhBMvrhpzdBeMeudXyap/G4h+/3QJ3JCELWVi84c=; b=jCciEw9aui9fs/pPNe71D+diMP9vsL3wbH2s4jMqd+Y841KtcBN7nxJuU9NFsBsb2Lz/Su kwwzKpe9SW3a0V5nP98C4tDStnlhN+Wi6abx0cxoe1yUprtYwgocpKuTOLIeOPoc6OJlWf sTh1hldHOm4rspIZSd2yqHAJNWHTc1Q= 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-115-HaG8VabsOHGs3_PDf83gSA-1; Tue, 06 Jul 2021 10:17:46 -0400 X-MC-Unique: HaG8VabsOHGs3_PDf83gSA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1DB9581840A; Tue, 6 Jul 2021 14:17:45 +0000 (UTC) Received: from fuller.cnet (ovpn-112-3.gru2.redhat.com [10.97.112.3]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 658F760CC6; Tue, 6 Jul 2021 14:17:41 +0000 (UTC) Received: by fuller.cnet (Postfix, from userid 1000) id 5A9AA416F5D2; Tue, 6 Jul 2021 11:17:23 -0300 (-03) Date: Tue, 6 Jul 2021 11:17:23 -0300 From: Marcelo Tosatti To: Frederic Weisbecker Cc: linux-kernel@vger.kernel.org, Christoph Lameter , Thomas Gleixner , Juri Lelli , Nitesh Lal , Peter Zijlstra Subject: Re: [patch 0/5] optionally sync per-CPU vmstats counter on return to userspace Message-ID: <20210706141723.GA68914@fuller.cnet> References: <20210701210336.358118649@fuller.cnet> <20210702123032.GA72061@lothringen> <20210702152816.GA4122@fuller.cnet> <20210706130925.GC107277@lothringen> <20210706140550.GA64308@fuller.cnet> <20210706140920.GA68399@fuller.cnet> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210706140920.GA68399@fuller.cnet> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 06, 2021 at 11:09:20AM -0300, Marcelo Tosatti wrote: > > > And I suspect some other people won't like much a new extension > > > to isolcpus. > > > > Why is that so? > > Ah, yes, that would be PeterZ. > > IIRC his main point was that its not runtime changeable. > We can (partially fix that), if that is the case. > > Peter, was that the only problem you saw with isolcpus interface? Oh, and BTW, isolcpus=managed_irq flag was recently added due to another isolation bug. This problem is the same category, so i don't see why it should be treated especially (yes, i agree isolcpus= interface should be improved, but thats what is available today).