From: Tejun Heo <tj@kernel.org>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Zhang Yanfei <zhangyanfei.yes@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Rafael J . Wysocki" <rjw@sisk.pl>,
lenb@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
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>,
isimatu.yasuaki@jp.fujitsu.com, izumi.taku@jp.fujitsu.com,
Mel Gorman <mgorman@suse.de>, Minchan Kim <minchan@kernel.org>,
mina86@mina86.com, gong.chen@linux.intel.com,
vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com,
Rik van Riel <riel@redhat.com>,
jweiner@redhat.com, prarit@redhat.com,
"x86@kernel.org" <x86@kernel.org>,
linux-doc@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
linux-acpi@vger.kernel.org, imtangchen@gmail.com,
Zhang Yanfei <zhangyanfei@cn.fujitsu.com>,
Tang Chen <tangchen@cn.fujitsu.com>
Subject: Re: [PATCH part1 v6 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up
Date: Wed, 9 Oct 2013 15:47:47 -0400 [thread overview]
Message-ID: <20131009194747.GC5592@mtj.dyndns.org> (raw)
In-Reply-To: <5255AEC1.7040500@intel.com>
Hello,
On Wed, Oct 09, 2013 at 12:30:09PM -0700, Dave Hansen wrote:
> On 10/09/2013 12:20 PM, Tejun Heo wrote:
> > Realistically tho, why would people be using 4k mappings on 2T
> > machines?
>
> CONFIG_DEBUG_PAGEALLOC and CONFIG_KMEMCHECK both disable using >4k
> pages. I actually ran in to this on a 1TB machine a few weeks ago:
>
> https://lkml.org/lkml/2013/8/9/546
>
> So it's not a common case for stuff that customers have, but it sure as
> *HECK* is needed for debugging.
But as I said in the same paragraph, parsing SRAT earlier doesn't
solve the problem in itself either. Ignoring the option if 4k mapping
is required and memory consumption would be prohibitive should work,
no? Something like that would be necessary if we're gonna worry about
cases like this no matter how we implement it, but, frankly, I'm not
sure this is something worth worrying about.
Thanks.
--
tejun
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next prev parent reply other threads:[~2013-10-09 19:48 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-04 1:56 [PATCH part1 v6 0/6] x86, memblock: Allocate memory near kernel image before SRAT parsed Zhang Yanfei
2013-10-04 1:57 ` [PATCH part1 v6 1/6] memblock: Factor out of top-down allocation Zhang Yanfei
2013-10-04 1:58 ` [PATCH part1 v6 2/6] memblock: Introduce bottom-up allocation mode Zhang Yanfei
2013-10-05 21:30 ` Toshi Kani
2013-10-04 1:59 ` [PATCH part1 v6 3/6] x86/mm: Factor out of top-down direct mapping setup Zhang Yanfei
2013-10-04 2:00 ` [PATCH part1 v6 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up Zhang Yanfei
2013-10-05 22:09 ` Toshi Kani
2013-10-07 0:00 ` H. Peter Anvin
2013-10-07 14:17 ` Zhang Yanfei
2013-10-08 17:36 ` Zhang Yanfei
2013-10-09 16:44 ` Tejun Heo
2013-10-09 17:14 ` Zhang Yanfei
2013-10-09 19:20 ` Tejun Heo
2013-10-09 19:30 ` Dave Hansen
2013-10-09 19:47 ` Tejun Heo [this message]
2013-10-09 20:58 ` Toshi Kani
2013-10-09 21:11 ` Tejun Heo
2013-10-09 21:14 ` H. Peter Anvin
2013-10-09 21:45 ` Zhang Yanfei
2013-10-09 23:10 ` H. Peter Anvin
2013-10-09 23:26 ` Zhang Yanfei
2013-10-10 1:20 ` Zhang Yanfei
2013-10-10 0:25 ` Toshi Kani
2013-10-09 23:58 ` Toshi Kani
2013-10-10 1:00 ` Tejun Heo
2013-10-10 14:36 ` Toshi Kani
2013-10-10 15:35 ` Tejun Heo
2013-10-10 16:24 ` Toshi Kani
2013-10-10 16:46 ` Tejun Heo
2013-10-10 16:50 ` Toshi Kani
2013-10-10 16:55 ` Tejun Heo
2013-10-10 16:59 ` Toshi Kani
2013-10-10 17:12 ` H. Peter Anvin
2013-10-10 19:17 ` Toshi Kani
2013-10-10 22:19 ` Tejun Heo
2013-10-10 23:00 ` Toshi Kani
2013-10-09 21:19 ` Zhang Yanfei
2013-10-09 21:22 ` H. Peter Anvin
2013-10-09 23:30 ` Zhang Yanfei
2013-10-09 19:10 ` Yinghai Lu
2013-10-09 19:23 ` Tejun Heo
2013-10-11 5:27 ` Yinghai Lu
2013-10-11 5:47 ` Zhang Yanfei
2013-10-11 6:33 ` Ingo Molnar
2013-10-11 6:46 ` Zhang Yanfei
2013-10-04 2:01 ` [PATCH part1 v6 5/6] x86, acpi, crash, kdump: Do reserve_crashkernel() after SRAT is parsed Zhang Yanfei
2013-10-05 22:10 ` Toshi Kani
2013-10-04 2:02 ` [PATCH part1 v6 6/6] mem-hotplug: Introduce movable_node boot option Zhang Yanfei
2013-10-05 22:28 ` Toshi Kani
2013-10-06 14:43 ` [PATCH part1 v6 update " Zhang Yanfei
2013-10-06 23:03 ` Toshi Kani
2013-10-08 4:23 ` [PATCH part1 v6 0/6] x86, memblock: Allocate memory near kernel image before SRAT parsed Ingo Molnar
2013-10-08 15:28 ` Zhang Yanfei
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