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 06FB8C433EF for ; Thu, 11 Nov 2021 02:40:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E529D61884 for ; Thu, 11 Nov 2021 02:40:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233870AbhKKCmx (ORCPT ); Wed, 10 Nov 2021 21:42:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:48512 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233571AbhKKCmx (ORCPT ); Wed, 10 Nov 2021 21:42:53 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 965E1610F7; Thu, 11 Nov 2021 02:40:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1636598404; bh=E3YFTwhDgZg/bCs5k3BUDP4zj7Bc5SA5F/zSMfm7X/8=; h=Date:From:To:Subject:From; b=xdUGKPt3i+hfHrKVwxtXn4XVAdgByAGiLC+2G7d0oYdMbSC9RgqXniPl7mmyz0o6I gnKLTqPIrJ5iGu/TEm2h17tMR6l/pHR0zvzrofABUbvgmNajDQppa5ZgO1bbEjZrrP RVRPPPWBGTRqsaiIT6GE/QyKzUZabbyRKoWOgIvg= Date: Wed, 10 Nov 2021 18:40:04 -0800 From: akpm@linux-foundation.org To: bigeasy@linutronix.de, david@redhat.com, mgorman@techsingularity.net, mm-commits@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de, vbabka@suse.cz Subject: [merged] =?US-ASCII?Q?mm-disable-numa=5Fbalancing=5Fdefault=5Fenabled-and-transpar?= =?US-ASCII?Q?ent=5Fhugepage-on-preempt=5Frt.patch?= removed from -mm tree Message-ID: <20211111024004.YElSC7TNe%akpm@linux-foundation.org> User-Agent: s-nail v14.8.16 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm: disable NUMA_BALANCING_DEFAULT_ENABLED and TRANSPARENT_HUGEPAGE on PREEMPT_RT has been removed from the -mm tree. Its filename was mm-disable-numa_balancing_default_enabled-and-transparent_hugepage-on-preempt_rt.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Sebastian Andrzej Siewior Subject: mm: disable NUMA_BALANCING_DEFAULT_ENABLED and TRANSPARENT_HUGEPAGE on PREEMPT_RT TRANSPARENT_HUGEPAGE: There are potential non-deterministic delays to an RT thread if a critical memory region is not THP-aligned and a non-RT buffer is located in the same hugepage-aligned region. It's also possible for an unrelated thread to migrate pages belonging to an RT task incurring unexpected page faults due to memory defragmentation even if khugepaged is disabled. Regular HUGEPAGEs are not affected by this can be used. NUMA_BALANCING: There is a non-deterministic delay to mark PTEs PROT_NONE to gather NUMA fault samples, increased page faults of regions even if mlocked and non-deterministic delays when migrating pages. [Mel Gorman worded 99% of the commit description]. Link: https://lore.kernel.org/all/20200304091159.GN3818@techsingularity.net/ Link: https://lore.kernel.org/all/20211026165100.ahz5bkx44lrrw5pt@linutronix.de/ Link: https://lkml.kernel.org/r/20211028143327.hfbxjze7palrpfgp@linutronix.de Signed-off-by: Sebastian Andrzej Siewior Acked-by: Mel Gorman Reviewed-by: David Hildenbrand Cc: Vlastimil Babka Cc: Peter Zijlstra Cc: Thomas Gleixner Signed-off-by: Andrew Morton --- init/Kconfig | 2 +- mm/Kconfig | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) --- a/init/Kconfig~mm-disable-numa_balancing_default_enabled-and-transparent_hugepage-on-preempt_rt +++ a/init/Kconfig @@ -901,7 +901,7 @@ config NUMA_BALANCING bool "Memory placement aware NUMA scheduler" depends on ARCH_SUPPORTS_NUMA_BALANCING depends on !ARCH_WANT_NUMA_VARIABLE_LOCALITY - depends on SMP && NUMA && MIGRATION + depends on SMP && NUMA && MIGRATION && !PREEMPT_RT help This option adds support for automatic NUMA aware memory/task placement. The mechanism is quite primitive and is based on migrating memory when --- a/mm/Kconfig~mm-disable-numa_balancing_default_enabled-and-transparent_hugepage-on-preempt_rt +++ a/mm/Kconfig @@ -371,7 +371,7 @@ config NOMMU_INITIAL_TRIM_EXCESS config TRANSPARENT_HUGEPAGE bool "Transparent Hugepage Support" - depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE + depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT select COMPACTION select XARRAY_MULTI help _ Patches currently in -mm which might be from bigeasy@linutronix.de are