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[2003:cb:c709:2700:cdd8:dcb0:2a69:8783]) by smtp.gmail.com with ESMTPSA id t4sm20135457wro.71.2022.01.26.09.04.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Jan 2022 09:04:50 -0800 (PST) Message-ID: <5d02ea0e-aca6-a64b-23de-bc9307572d17@redhat.com> Date: Wed, 26 Jan 2022 18:04:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0 Subject: Re: [PATCH 1/2] mm/memory_hotplug: Export shrink span functions for zone and node To: Jonghyeon Kim , dan.j.williams@intel.com Cc: vishal.l.verma@intel.com, dave.jiang@intel.com, akpm@linux-foundation.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <20220126170002.19754-1-tome01@ajou.ac.kr> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20220126170002.19754-1-tome01@ajou.ac.kr> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 84B0F1800A3 X-Stat-Signature: zszgakokpnuffj6jj7ry1nr8xcw5pnn6 X-Rspam-User: nil Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=KIh7+YJk; spf=none (imf06.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.129.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-HE-Tag: 1643216694-271582 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 26.01.22 18:00, Jonghyeon Kim wrote: > Export shrink_zone_span() and update_pgdat_span() functions to head > file. We need to update real number of spanned pages for NUMA nodes and > zones when we add memory device node such as device dax memory. > Can you elaborate a bit more what you intend to fix? Memory onlining/offlining is reponsible for updating the node/zone span, and that's triggered when the dax/kmem mamory gets onlined/offlined. > Signed-off-by: Jonghyeon Kim > --- > include/linux/memory_hotplug.h | 3 +++ > mm/memory_hotplug.c | 6 ++++-- > 2 files changed, 7 insertions(+), 2 deletions(-) > > diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h > index be48e003a518..25c7f60c317e 100644 > --- a/include/linux/memory_hotplug.h > +++ b/include/linux/memory_hotplug.h > @@ -337,6 +337,9 @@ extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, > extern void remove_pfn_range_from_zone(struct zone *zone, > unsigned long start_pfn, > unsigned long nr_pages); > +extern void shrink_zone_span(struct zone *zone, unsigned long start_pfn, > + unsigned long end_pfn); > +extern void update_pgdat_span(struct pglist_data *pgdat); > extern bool is_memblock_offlined(struct memory_block *mem); > extern int sparse_add_section(int nid, unsigned long pfn, > unsigned long nr_pages, struct vmem_altmap *altmap); > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 2a9627dc784c..38f46a9ef853 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -389,7 +389,7 @@ static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, > return 0; > } > > -static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, > +void shrink_zone_span(struct zone *zone, unsigned long start_pfn, > unsigned long end_pfn) > { > unsigned long pfn; > @@ -428,8 +428,9 @@ static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, > } > } > } > +EXPORT_SYMBOL_GPL(shrink_zone_span); Exporting both as symbols feels very wrong. This is memory onlining/offlining internal stuff. -- Thanks, David / dhildenb