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From: Wei Yang <richard.weiyang@gmail.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org, Mel Gorman <mgorman@suse.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Jerome Glisse <jglisse@redhat.com>,
	Reza Arbab <arbab@linux.vnet.ibm.com>,
	Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
	qiuxishi@huawei.com, Kani Toshimitsu <toshi.kani@hpe.com>,
	slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>,
	Andi Kleen <ak@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	Igor Mammedov <imammedo@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Heiko Carstens <heiko.carstens@de.ibm.com>,
	Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH 11/14] mm, memory_hotplug: do not associate hotadded memory to zones until online
Date: Sun, 25 Jun 2017 08:14:13 +0800	[thread overview]
Message-ID: <20170625001413.GA43522@WeideMacBook-Pro.local> (raw)
In-Reply-To: <20170515085827.16474-12-mhocko@kernel.org>

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On Mon, May 15, 2017 at 10:58:24AM +0200, Michal Hocko wrote:
>From: Michal Hocko <mhocko@suse.com>
>
[...]
>+void move_pfn_range_to_zone(struct zone *zone,
>+		unsigned long start_pfn, unsigned long nr_pages)
>+{
>+	struct pglist_data *pgdat = zone->zone_pgdat;
>+	int nid = pgdat->node_id;
>+	unsigned long flags;
>+	unsigned long i;

This is an unused variable:

  mm/memory_hotplug.c: In function ‘move_pfn_range_to_zone’:
  mm/memory_hotplug.c:895:16: warning: unused variable ‘i’ [-Wunused-variable]

Do you suggest me to write a patch or you would fix it in your later rework?

>+
>+	if (zone_is_empty(zone))
>+		init_currently_empty_zone(zone, start_pfn, nr_pages);
>+
>+	clear_zone_contiguous(zone);
>+
>+	/* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */
>+	pgdat_resize_lock(pgdat, &flags);
>+	zone_span_writelock(zone);
>+	resize_zone_range(zone, start_pfn, nr_pages);
>+	zone_span_writeunlock(zone);
>+	resize_pgdat_range(pgdat, start_pfn, nr_pages);
>+	pgdat_resize_unlock(pgdat, &flags);
>+
>+	/*
>+	 * TODO now we have a visible range of pages which are not associated
>+	 * with their zone properly. Not nice but set_pfnblock_flags_mask
>+	 * expects the zone spans the pfn range. All the pages in the range
>+	 * are reserved so nobody should be touching them so we should be safe
>+	 */
>+	memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, MEMMAP_HOTPLUG);
>+	for (i = 0; i < nr_pages; i++) {
>+		unsigned long pfn = start_pfn + i;
>+		set_page_links(pfn_to_page(pfn), zone_idx(zone), nid, pfn);
> 	}
> 
>2.11.0

-- 
Wei Yang
Help you, Help me

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  parent reply	other threads:[~2017-06-25  0:14 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-15  8:58 [PATCH -v4 0/14] mm: make movable onlining suck less Michal Hocko
2017-05-15  8:58 ` Michal Hocko
2017-05-15  8:58 ` [PATCH 01/14] mm: remove return value from init_currently_empty_zone Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 02/14] mm, memory_hotplug: use node instead of zone in can_online_high_movable Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 03/14] mm: drop page_initialized check from get_nid_for_pfn Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 04/14] mm, memory_hotplug: get rid of is_zone_device_section Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-06-10  9:56   ` Wei Yang
2017-06-10  9:56     ` Wei Yang
2017-06-10 14:58     ` Wei Yang
2017-06-10 14:58       ` Wei Yang
2017-06-12  6:49       ` Michal Hocko
2017-06-12  6:49         ` Michal Hocko
2017-06-14  6:17         ` Wei Yang
2017-06-14  6:12     ` Wei Yang
2017-06-14  6:32       ` Michal Hocko
2017-06-14  6:32         ` Michal Hocko
2017-06-14  9:12         ` Wei Yang
2017-06-14  9:24           ` Michal Hocko
2017-06-14  9:24             ` Michal Hocko
2017-06-15  1:02             ` Wei Yang
2017-05-15  8:58 ` [PATCH 05/14] mm, memory_hotplug: split up register_one_node Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 06/14] mm, memory_hotplug: consider offline memblocks removable Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 07/14] mm: consider zone which is not fully populated to have holes Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-18 16:14   ` Vlastimil Babka
2017-05-18 16:14     ` Vlastimil Babka
2017-05-18 16:42     ` Michal Hocko
2017-05-18 16:42       ` Michal Hocko
2017-05-19  7:21       ` Vlastimil Babka
2017-05-19  7:21         ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 08/14] mm, compaction: skip over holes in __reset_isolation_suitable Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  7:23   ` Vlastimil Babka
2017-05-19  7:23     ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 09/14] mm: __first_valid_page skip over offline pages Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  8:05   ` Vlastimil Babka
2017-05-19  8:05     ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 10/14] mm, vmstat: skip reporting offline pages in pagetypeinfo Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  8:17   ` Vlastimil Babka
2017-05-19  8:17     ` Vlastimil Babka
2017-05-15  8:58 ` [PATCH 11/14] mm, memory_hotplug: do not associate hotadded memory to zones until online Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-19  8:56   ` Vlastimil Babka
2017-05-19  8:56     ` Vlastimil Babka
2017-06-16  4:20   ` Wei Yang
2017-06-16  8:05     ` Michal Hocko
2017-06-16  8:05       ` Michal Hocko
2017-06-16  8:11   ` Wei Yang
2017-06-16  8:45     ` Michal Hocko
2017-06-16  8:45       ` Michal Hocko
2017-06-16  9:11       ` Wei Yang
2017-06-25  0:14   ` Wei Yang [this message]
2017-06-26  5:38     ` Michal Hocko
2017-06-26  5:38       ` Michal Hocko
2017-05-15  8:58 ` [PATCH 12/14] mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 13/14] mm, memory_hotplug: fix the section mismatch warning Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-05-15  8:58 ` [PATCH 14/14] mm, memory_hotplug: remove unused cruft after memory hotplug rework Michal Hocko
2017-05-15  8:58   ` Michal Hocko
2017-06-09  9:51 ` [PATCH -v4 0/14] mm: make movable onlining suck less Wei Yang
2017-06-09  9:51   ` Wei Yang
2017-06-09 10:49   ` Michal Hocko
2017-06-09 10:49     ` Michal Hocko
2017-06-10  2:20     ` Wei Yang
2017-06-10  2:20       ` Wei Yang

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