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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 9962BC433ED for ; Thu, 22 Apr 2021 20:34:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0FFE4613CD for ; Thu, 22 Apr 2021 20:34:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0FFE4613CD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6D28B6B0088; Thu, 22 Apr 2021 16:34:09 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6AA3B6B0092; Thu, 22 Apr 2021 16:34:09 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 570EC6B00A6; Thu, 22 Apr 2021 16:34:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0039.hostedemail.com [216.40.44.39]) by kanga.kvack.org (Postfix) with ESMTP id 3566B6B0088 for ; Thu, 22 Apr 2021 16:34:09 -0400 (EDT) Received: from smtpin35.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id D69B5181AC550 for ; Thu, 22 Apr 2021 20:34:08 +0000 (UTC) X-FDA: 78061154976.35.ACFD937 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf10.hostedemail.com (Postfix) with ESMTP id 3E95740002E0 for ; Thu, 22 Apr 2021 20:34:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1619123647; 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=bPsR9zAvMT1rXu00S7RjYydgHJfjQUx3EMwYfq9HIMg=; b=C7yisIlsfaD3CkrGkhV0wpDsf99UcjreWwSqH7lz7jTuhJeiNuGFZggZUbC0iZOJJ2eH8O kcVLU5zQT4Msny18EBGDK4pONKHFfSHje5I5TbvpmFqL+RGizZyBgyPYE8A1Qm+WPy6/vd 8w8ByP/CyOlEH3O9pD0K+6ucxxuiYGc= 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-516-x7oK4LyIMbOEnxlHSgLzJA-1; Thu, 22 Apr 2021 16:34:05 -0400 X-MC-Unique: x7oK4LyIMbOEnxlHSgLzJA-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 BBAD4343A2; Thu, 22 Apr 2021 20:34:02 +0000 (UTC) Received: from optiplex-fbsd (unknown [10.3.128.3]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E5CFD60C17; Thu, 22 Apr 2021 20:33:58 +0000 (UTC) Date: Thu, 22 Apr 2021 16:33:56 -0400 From: Rafael Aquini To: chukaiping Cc: mcgrof@kernel.org, keescook@chromium.org, yzaikin@google.com, akpm@linux-foundation.org, vbabka@suse.cz, nigupta@nvidia.com, bhe@redhat.com, khalid.aziz@oracle.com, iamjoonsoo.kim@lge.com, mateusznosek0@gmail.com, sh_def@163.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2] mm/compaction:let proactive compaction order configurable Message-ID: References: <1618989713-20962-1-git-send-email-chukaiping@baidu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1618989713-20962-1-git-send-email-chukaiping@baidu.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Stat-Signature: ztxtp47s87qe9nrtw3w7rajf6s786fmt X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 3E95740002E0 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf10; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=170.10.133.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619123640-374850 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 Wed, Apr 21, 2021 at 03:21:53PM +0800, chukaiping wrote: > Currently the proactive compaction order is fixed to > COMPACTION_HPAGE_ORDER(9), it's OK in most machines with lots of > normal 4KB memory, but it's too high for the machines with small > normal memory, for example the machines with most memory configured > as 1GB hugetlbfs huge pages. In these machines the max order of > free pages is often below 9, and it's always below 9 even with hard > compaction. This will lead to proactive compaction be triggered very > frequently. In these machines we only care about order of 3 or 4. > This patch export the oder to proc and let it configurable > by user, and the default value is still COMPACTION_HPAGE_ORDER. > > Signed-off-by: chukaiping > Reported-by: kernel test robot > --- > > Changes in v2: > - fix the compile error in ia64 and powerpc > - change the hard coded max order number from 10 to MAX_ORDER - 1 > > include/linux/compaction.h | 1 + > kernel/sysctl.c | 11 +++++++++++ > mm/compaction.c | 14 +++++++++++--- > 3 files changed, 23 insertions(+), 3 deletions(-) > > diff --git a/include/linux/compaction.h b/include/linux/compaction.h > index ed4070e..151ccd1 100644 > --- a/include/linux/compaction.h > +++ b/include/linux/compaction.h > @@ -83,6 +83,7 @@ static inline unsigned long compact_gap(unsigned int order) > #ifdef CONFIG_COMPACTION > extern int sysctl_compact_memory; > extern unsigned int sysctl_compaction_proactiveness; > +extern unsigned int sysctl_compaction_order; > extern int sysctl_compaction_handler(struct ctl_table *table, int write, > void *buffer, size_t *length, loff_t *ppos); > extern int sysctl_extfrag_threshold; > diff --git a/kernel/sysctl.c b/kernel/sysctl.c > index 62fbd09..a607d4d 100644 > --- a/kernel/sysctl.c > +++ b/kernel/sysctl.c > @@ -195,6 +195,8 @@ enum sysctl_writes_mode { > #endif /* CONFIG_SMP */ > #endif /* CONFIG_SCHED_DEBUG */ > > +static int max_buddy_zone = MAX_ORDER - 1; > + This should go into the #ifdef CONFIG_COMPACTION section below > #ifdef CONFIG_COMPACTION > static int min_extfrag_threshold; > static int max_extfrag_threshold = 1000; > @@ -2871,6 +2873,15 @@ int proc_do_static_key(struct ctl_table *table, int write, > .extra2 = &one_hundred, > }, > { > + .procname = "compaction_order", > + .data = &sysctl_compaction_order, > + .maxlen = sizeof(sysctl_compaction_order), > + .mode = 0644, > + .proc_handler = proc_dointvec_minmax, > + .extra1 = SYSCTL_ZERO, > + .extra2 = &max_buddy_zone, > + }, > + { > .procname = "extfrag_threshold", > .data = &sysctl_extfrag_threshold, > .maxlen = sizeof(int), > diff --git a/mm/compaction.c b/mm/compaction.c > index e04f447..bfd1d5e 100644 > --- a/mm/compaction.c > +++ b/mm/compaction.c > @@ -1925,16 +1925,16 @@ static bool kswapd_is_running(pg_data_t *pgdat) > > /* > * A zone's fragmentation score is the external fragmentation wrt to the > - * COMPACTION_HPAGE_ORDER. It returns a value in the range [0, 100]. > + * sysctl_compaction_order. It returns a value in the range [0, 100]. > */ > static unsigned int fragmentation_score_zone(struct zone *zone) > { > - return extfrag_for_order(zone, COMPACTION_HPAGE_ORDER); > + return extfrag_for_order(zone, sysctl_compaction_order); > } > > /* > * A weighted zone's fragmentation score is the external fragmentation > - * wrt to the COMPACTION_HPAGE_ORDER scaled by the zone's size. It > + * wrt to the sysctl_compaction_order scaled by the zone's size. It > * returns a value in the range [0, 100]. > * > * The scaling factor ensures that proactive compaction focuses on larger > @@ -2666,6 +2666,7 @@ static void compact_nodes(void) > * background. It takes values in the range [0, 100]. > */ > unsigned int __read_mostly sysctl_compaction_proactiveness = 20; > +unsigned int __read_mostly sysctl_compaction_order; > > /* > * This is the entry point for compacting all nodes via > @@ -2958,6 +2959,13 @@ static int __init kcompactd_init(void) > int nid; > int ret; > > + /* > + * move the initialization of sysctl_compaction_order to here to > + * eliminate compile error in ia64 and powerpc architecture because > + * COMPACTION_HPAGE_ORDER is a variable in this architecture > + */ This comment block belongs to your commit log, instead. Cheers, -- Rafael > + sysctl_compaction_order = COMPACTION_HPAGE_ORDER; > + > ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, > "mm/compaction:online", > kcompactd_cpu_online, NULL); > -- > 1.7.1 > >