From: Michal Hocko <mhocko@kernel.org> To: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: linux-mm@kvack.org, "'Andrew Morton'" <akpm@linux-foundation.org>, "'Mel Gorman'" <mgorman@suse.de>, "'Vlastimil Babka'" <vbabka@suse.cz>, "'Andrea Arcangeli'" <aarcange@redhat.com>, "'Reza Arbab'" <arbab@linux.vnet.ibm.com>, "'Yasuaki Ishimatsu'" <yasu.isimatu@gmail.com>, "'Tang Chen'" <tangchen@cn.fujitsu.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>, "'Dan Williams'" <dan.j.williams@gmail.com>, "'Heiko Carstens'" <heiko.carstens@de.ibm.com>, "'Lai Jiangshan'" <laijs@cn.fujitsu.com>, "'Martin Schwidefsky'" <schwidefsky@de.ibm.com> Subject: Re: [PATCH 5/6] mm, memory_hotplug: do not associate hotadded memory to zones until online Date: Fri, 31 Mar 2017 08:50:02 +0200 [thread overview] Message-ID: <20170331065002.GD27098@dhcp22.suse.cz> (raw) In-Reply-To: <04c901d2a9e6$91968a20$b4c39e60$@alibaba-inc.com> On Fri 31-03-17 14:18:08, Hillf Danton wrote: > > On March 30, 2017 7:55 PM Michal Hocko wrote: > > > > +static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, > > + unsigned long nr_pages) > > +{ > > + unsigned long old_end_pfn = zone_end_pfn(zone); > > + > > + if (start_pfn < zone->zone_start_pfn) > > + zone->zone_start_pfn = start_pfn; > > + > > + zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; > > +} > The implementation above implies zone can only go bigger. yes, we do not shrink zones currently and I see no poit in doing that right now. > Can we resize zone with the given data? Why couldn't we? -- Michal Hocko SUSE Labs
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From: Michal Hocko <mhocko@kernel.org> To: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: linux-mm@kvack.org, 'Andrew Morton' <akpm@linux-foundation.org>, 'Mel Gorman' <mgorman@suse.de>, 'Vlastimil Babka' <vbabka@suse.cz>, 'Andrea Arcangeli' <aarcange@redhat.com>, 'Reza Arbab' <arbab@linux.vnet.ibm.com>, 'Yasuaki Ishimatsu' <yasu.isimatu@gmail.com>, 'Tang Chen' <tangchen@cn.fujitsu.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>, 'Dan Williams' <dan.j.williams@gmail.com>, 'Heiko Carstens' <heiko.carstens@de.ibm.com>, 'Lai Jiangshan' <laijs@cn.fujitsu.com>, 'Martin Schwidefsky' <schwidefsky@de.ibm.com> Subject: Re: [PATCH 5/6] mm, memory_hotplug: do not associate hotadded memory to zones until online Date: Fri, 31 Mar 2017 08:50:02 +0200 [thread overview] Message-ID: <20170331065002.GD27098@dhcp22.suse.cz> (raw) In-Reply-To: <04c901d2a9e6$91968a20$b4c39e60$@alibaba-inc.com> On Fri 31-03-17 14:18:08, Hillf Danton wrote: > > On March 30, 2017 7:55 PM Michal Hocko wrote: > > > > +static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, > > + unsigned long nr_pages) > > +{ > > + unsigned long old_end_pfn = zone_end_pfn(zone); > > + > > + if (start_pfn < zone->zone_start_pfn) > > + zone->zone_start_pfn = start_pfn; > > + > > + zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; > > +} > The implementation above implies zone can only go bigger. yes, we do not shrink zones currently and I see no poit in doing that right now. > Can we resize zone with the given data? Why couldn't we? -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-03-31 6:50 UTC|newest] Thread overview: 140+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-30 11:54 [PATCH 0/6] mm: make movable onlining suck less Michal Hocko 2017-03-30 11:54 ` Michal Hocko 2017-03-30 11:54 ` [PATCH 1/6] mm: get rid of zone_is_initialized Michal Hocko 2017-03-30 11:54 ` Michal Hocko 2017-03-31 3:39 ` Hillf Danton 2017-03-31 3:39 ` Hillf Danton 2017-03-31 6:43 ` Michal Hocko 2017-03-31 6:43 ` Michal Hocko 2017-03-31 6:48 ` Michal Hocko 2017-03-31 6:48 ` Michal Hocko 2017-03-31 7:39 ` [PATCH v1 " Michal Hocko 2017-03-31 7:39 ` Michal Hocko 2017-04-05 8:14 ` Michal Hocko 2017-04-05 8:14 ` Michal Hocko 2017-04-05 9:06 ` Igor Mammedov 2017-04-05 9:06 ` Igor Mammedov 2017-04-05 9:23 ` Michal Hocko 2017-04-05 9:23 ` Michal Hocko 2017-03-30 11:54 ` [PATCH 2/6] mm, tile: drop arch_{add,remove}_memory Michal Hocko 2017-03-30 11:54 ` Michal Hocko 2017-03-30 15:41 ` Chris Metcalf 2017-03-30 15:41 ` Chris Metcalf 2017-03-30 11:54 ` [PATCH 3/6] mm: remove return value from init_currently_empty_zone Michal Hocko 2017-03-30 11:54 ` Michal Hocko 2017-03-31 3:49 ` Hillf Danton 2017-03-31 3:49 ` Hillf Danton 2017-03-31 6:49 ` Michal Hocko 2017-03-31 6:49 ` Michal Hocko 2017-03-31 7:06 ` Hillf Danton 2017-03-31 7:06 ` Hillf Danton 2017-03-31 7:18 ` Michal Hocko 2017-03-31 7:18 ` Michal Hocko 2017-03-31 7:43 ` Michal Hocko 2017-03-31 7:43 ` Michal Hocko 2017-04-03 21:22 ` Reza Arbab 2017-04-03 21:22 ` Reza Arbab 2017-04-04 7:30 ` Michal Hocko 2017-04-04 7:30 ` Michal Hocko 2017-03-30 11:54 ` [PATCH 4/6] mm, memory_hotplug: use node instead of zone in can_online_high_movable Michal Hocko 2017-03-30 11:54 ` Michal Hocko 2017-03-30 11:54 ` [PATCH 5/6] mm, memory_hotplug: do not associate hotadded memory to zones until online Michal Hocko 2017-03-30 11:54 ` Michal Hocko 2017-03-31 6:18 ` Hillf Danton 2017-03-31 6:18 ` Hillf Danton 2017-03-31 6:50 ` Michal Hocko [this message] 2017-03-31 6:50 ` Michal Hocko 2017-04-04 12:21 ` Tobias Regnery 2017-04-04 12:21 ` Tobias Regnery 2017-04-04 12:45 ` Michal Hocko 2017-04-04 12:45 ` Michal Hocko 2017-04-06 8:14 ` Michal Hocko 2017-04-06 8:14 ` Michal Hocko 2017-04-06 12:46 ` Michal Hocko 2017-04-06 12:46 ` Michal Hocko 2017-03-30 11:54 ` [PATCH 6/6] mm, memory_hotplug: remove unused cruft after memory hotplug rework Michal Hocko 2017-03-30 11:54 ` Michal Hocko 2017-03-31 7:46 ` Michal Hocko 2017-03-31 7:46 ` Michal Hocko 2017-03-31 19:19 ` [PATCH 0/6] mm: make movable onlining suck less Heiko Carstens 2017-03-31 19:19 ` Heiko Carstens 2017-04-03 7:34 ` Michal Hocko 2017-04-03 7:34 ` Michal Hocko 2017-04-03 11:55 ` Michal Hocko 2017-04-03 11:55 ` Michal Hocko 2017-04-03 12:20 ` Igor Mammedov 2017-04-03 12:20 ` Igor Mammedov 2017-04-03 19:58 ` Reza Arbab 2017-04-03 19:58 ` Reza Arbab 2017-04-03 20:23 ` Michal Hocko 2017-04-03 20:23 ` Michal Hocko 2017-04-03 20:42 ` Reza Arbab 2017-04-03 20:42 ` Reza Arbab 2017-04-04 7:23 ` Michal Hocko 2017-04-04 7:23 ` Michal Hocko 2017-04-04 7:34 ` Michal Hocko 2017-04-04 7:34 ` Michal Hocko 2017-04-04 8:23 ` Michal Hocko 2017-04-04 8:23 ` Michal Hocko 2017-04-04 15:59 ` Reza Arbab 2017-04-04 15:59 ` Reza Arbab 2017-04-04 16:02 ` Reza Arbab 2017-04-04 16:02 ` Reza Arbab 2017-04-04 16:44 ` Michal Hocko 2017-04-04 16:44 ` Michal Hocko 2017-04-04 18:30 ` Reza Arbab 2017-04-04 18:30 ` Reza Arbab 2017-04-04 19:41 ` Michal Hocko 2017-04-04 19:41 ` Michal Hocko 2017-04-04 21:43 ` Reza Arbab 2017-04-04 21:43 ` Reza Arbab 2017-04-05 6:42 ` Michal Hocko 2017-04-05 6:42 ` Michal Hocko 2017-04-05 9:24 ` Michal Hocko 2017-04-05 9:24 ` Michal Hocko 2017-04-05 14:53 ` Reza Arbab 2017-04-05 14:53 ` Reza Arbab 2017-04-05 15:42 ` Michal Hocko 2017-04-05 15:42 ` Michal Hocko 2017-04-05 17:32 ` Reza Arbab 2017-04-05 17:32 ` Reza Arbab 2017-04-05 18:15 ` Michal Hocko 2017-04-05 18:15 ` Michal Hocko 2017-04-05 19:39 ` Michal Hocko 2017-04-05 19:39 ` Michal Hocko 2017-04-05 21:02 ` Michal Hocko 2017-04-05 21:02 ` Michal Hocko 2017-04-06 11:07 ` Michal Hocko 2017-04-06 11:07 ` Michal Hocko 2017-04-05 15:48 ` Reza Arbab 2017-04-05 15:48 ` Reza Arbab 2017-04-05 16:34 ` Michal Hocko 2017-04-05 16:34 ` Michal Hocko 2017-04-05 20:55 ` Reza Arbab 2017-04-05 20:55 ` Reza Arbab 2017-04-06 9:25 ` Michal Hocko 2017-04-06 9:25 ` Michal Hocko 2017-04-05 13:52 ` Michal Hocko 2017-04-05 13:52 ` Michal Hocko 2017-04-05 15:23 ` Reza Arbab 2017-04-05 15:23 ` Reza Arbab 2017-04-05 6:36 ` Michal Hocko 2017-04-05 6:36 ` Michal Hocko 2017-04-06 13:08 ` Michal Hocko 2017-04-06 13:08 ` Michal Hocko 2017-04-06 15:24 ` Reza Arbab 2017-04-06 15:24 ` Reza Arbab 2017-04-06 15:41 ` Michal Hocko 2017-04-06 15:41 ` Michal Hocko 2017-04-06 15:46 ` Reza Arbab 2017-04-06 15:46 ` Reza Arbab 2017-04-06 16:21 ` Michal Hocko 2017-04-06 16:21 ` Michal Hocko 2017-04-06 16:24 ` Mel Gorman 2017-04-06 16:24 ` Mel Gorman 2017-04-06 16:55 ` Mel Gorman 2017-04-06 16:55 ` Mel Gorman 2017-04-06 17:12 ` Michal Hocko 2017-04-06 17:12 ` Michal Hocko 2017-04-06 17:46 ` Mel Gorman 2017-04-06 17:46 ` Mel Gorman
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