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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B274C433EF for ; Thu, 28 Oct 2021 16:17:20 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2D4966103C for ; Thu, 28 Oct 2021 16:17:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2D4966103C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 41E25940007; Thu, 28 Oct 2021 12:17:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3A68B6B0071; Thu, 28 Oct 2021 12:17:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 26EFD940007; Thu, 28 Oct 2021 12:17:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0088.hostedemail.com [216.40.44.88]) by kanga.kvack.org (Postfix) with ESMTP id EE07B6B006C for ; Thu, 28 Oct 2021 12:17:18 -0400 (EDT) Received: from smtpin37.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 6B6CB18337A39 for ; Thu, 28 Oct 2021 16:17:18 +0000 (UTC) X-FDA: 78746350956.37.7962B01 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf11.hostedemail.com (Postfix) with ESMTP id 00E3AF000233 for ; Thu, 28 Oct 2021 16:17:17 +0000 (UTC) Date: Thu, 28 Oct 2021 18:17:14 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1635437836; 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=wIAt4Et7HmYDEj3ujFEX5SlOyz3bmtisFdilC/WB5bA=; b=06fammxcqLgg4Ss1gQlseC9BCaKaK48tLFaOnOWPSSf7Hd3iYbpBH6vNb71KttlWHOfECT jRR1JM5p4lMovRz0VX41eH7xJ60b7iel4btBstlvk4xv4uPihJkj55TSuWdiWB8jNQAAR3 313Lnl3Fdk+L99sYNtJg3cRga2x6vw6E+XzVeQPXNMNLflbWPsKK3msmv0X4EpzIJHnrq/ xqqWgYKVi+lRMuhQboFn4EOLIzYW3Cwp5qCgZ7VGP7uXRSs4rvkt/p36DgDegM5rbsrwFB UNc0B1bo8hU3bhcpPGpg/Vx3zVl+LV7Y9o37d/0zjInT9KQ5gF61rMW9nQITyA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1635437836; 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=wIAt4Et7HmYDEj3ujFEX5SlOyz3bmtisFdilC/WB5bA=; b=LAUSNMzJTABROau6ba0wsBDZGC4/JoheRE0WxYyQD0jafBiu6Bt6WsWBKWOCf/qC94B1rx vKW/WUncRME1MVBw== From: Sebastian Andrzej Siewior To: David Hildenbrand Cc: Andrew Morton , Mel Gorman , linux-mm@kvack.org, Vlastimil Babka , Peter Zijlstra , Thomas Gleixner Subject: Re: [PATCH] mm: Disable NUMA_BALANCING_DEFAULT_ENABLED and TRANSPARENT_HUGEPAGE on PREEMPT_RT Message-ID: <20211028161714.3tugpschzb5gnzym@linutronix.de> References: <20211028143327.hfbxjze7palrpfgp@linutronix.de> <53abed4c-a66b-9735-4411-c919ede8c47c@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <53abed4c-a66b-9735-4411-c919ede8c47c@redhat.com> X-Rspamd-Queue-Id: 00E3AF000233 Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=06fammxc; dkim=pass header.d=linutronix.de header.s=2020e header.b=LAUSNMzJ; spf=pass (imf11.hostedemail.com: domain of bigeasy@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=bigeasy@linutronix.de; dmarc=pass (policy=none) header.from=linutronix.de X-Stat-Signature: ptjuixs3jfy6brcxn46dd4j4fwtn4qob X-Rspamd-Server: rspam06 X-HE-Tag: 1635437837-678554 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2021-10-28 17:54:01 [+0200], David Hildenbrand wrote: > Makes perfect sense to me. I was also wondering how "dangerous" > MIGRATION (and everything depending on it, like CMA, compaction, > MEMORY_HOTREMOVE, ...) is for RT recently. for compatcion there is 6923aa0d8c629 ("mm/compaction: Disable compact_unevictable_allowed on RT") to honour mlock() otherwise it can end unpleasant. But yeah, any page migrations outside of the "setup/ init" phase of the RT task are bad. Sebastian