From: "H. Peter Anvin" <hpa@zytor.com>
To: Mel Gorman <mgorman@suse.de>, Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Tejun Heo <tj@kernel.org>, Len Brown <lenb@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
Toshi Kani <toshi.kani@hp.com>,
Wanpeng Li <liwanp@linux.vnet.ibm.com>,
Thomas Renninger <trenn@suse.de>, Yinghai Lu <yinghai@kernel.org>,
Jiang Liu <jiang.liu@huawei.com>,
Wen Congyang <wency@cn.fujitsu.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
Taku Izumi <izumi.taku@jp.fujitsu.com>,
Minchan Kim <minchan@kernel.org>,
"mina86@mina86.com" <mina86@mina86.com>,
"gong.chen@linux.intel.com" <gong.chen@linux.intel.com>,
Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com>,
"lwoodman@redhat.com" <lwoodman@redhat.com>,
Rik van Riel <riel@redhat.com>,
"jweiner@redhat.com" <jweiner@redhat.com>,
Prarit Bhargava <prarit@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>, Chen Tang <imtangchen@gmail.com>,
Tang Chen <tangchen@cn.fujitsu.com>,
Zhang Yanfei <zhangyanfei.yes@gmail.com>
Subject: Re: [PATCH RESEND part2 v2 1/8] x86: get pg_data_t's memory from other node
Date: Thu, 16 Jan 2014 16:15:19 -0800 [thread overview]
Message-ID: <52D87617.8090804@zytor.com> (raw)
In-Reply-To: <20140116171112.GB24740@suse.de>
On 01/16/2014 09:11 AM, Mel Gorman wrote:
> This implies that it is possible to ahve a configuration with a big ratio
> difference between Normal:Movable memory.
In fact, one would expect that would be the norm.
> In such configurations there
> would be a risk that the system will reclaim heavily or go OOM because
> the kernrel cannot allocate memory due to a relatively small Normal
> zone. What protects against that? Is the user ever warned if the ratio
> between Normal:Movable very high? The movable_node boot parameter still
> turns the feature on and off, there appears to be no way of controlling
> the ratio of memory other than booting with the minimum amount of memory
> and manually hot-adding the sections to set the appropriate ratio.
This is really the fundamental problem with this particular approach to
hotswap memory.
-hpa
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next prev parent reply other threads:[~2014-01-17 0:16 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-03 2:19 [PATCH RESEND part2 v2 0/8] Arrange hotpluggable memory as ZONE_MOVABLE Zhang Yanfei
2013-12-03 2:22 ` [PATCH RESEND part2 v2 1/8] x86: get pg_data_t's memory from other node Zhang Yanfei
2014-01-16 17:11 ` Mel Gorman
2014-01-17 0:15 ` H. Peter Anvin [this message]
2014-01-20 7:29 ` Tang Chen
2014-01-20 15:14 ` Mel Gorman
2014-02-06 10:12 ` Mel Gorman
2014-02-10 5:44 ` Tang Chen
2014-02-11 11:08 ` Mel Gorman
2014-02-12 7:11 ` Tang Chen
2013-12-03 2:24 ` [PATCH RESEND part2 v2 2/8] memblock, numa: Introduce flag into memblock Zhang Yanfei
2013-12-03 2:25 ` [PATCH RESEND part2 v2 3/8] memblock, mem_hotplug: Introduce MEMBLOCK_HOTPLUG flag to mark hotpluggable regions Zhang Yanfei
2013-12-03 2:25 ` [PATCH RESEND part2 v2 4/8] memblock: Make memblock_set_node() support different memblock_type Zhang Yanfei
2013-12-03 2:27 ` [PATCH RESEND part2 v2 5/8] acpi, numa, mem_hotplug: Mark hotpluggable memory in memblock Zhang Yanfei
2013-12-03 2:28 ` [PATCH RESEND part2 v2 6/8] acpi, numa, mem_hotplug: Mark all nodes the kernel resides un-hotpluggable Zhang Yanfei
2013-12-03 23:44 ` Andrew Morton
2013-12-04 2:09 ` [PATCH update " Zhang Yanfei
2013-12-03 2:29 ` [PATCH RESEND part2 v2 7/8] memblock, mem_hotplug: Make memblock skip hotpluggable regions if needed Zhang Yanfei
2013-12-03 2:30 ` [PATCH RESEND part2 v2 8/8] x86, numa, acpi, memory-hotplug: Make movable_node have higher priority Zhang Yanfei
2014-01-16 17:03 ` Mel Gorman
2013-12-03 2:45 ` [PATCH RESEND part2 v2 0/8] Arrange hotpluggable memory as ZONE_MOVABLE Zhang Yanfei
2013-12-03 23:48 ` Andrew Morton
2013-12-04 0:02 ` Zhang Yanfei
2013-12-04 9:53 ` Ingo Molnar
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