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From: Zhang Yanfei <zhangyanfei.yes@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>,
	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@kva>
Subject: Re: [PATCH part1 v6 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up
Date: Thu, 10 Oct 2013 07:30:09 +0800	[thread overview]
Message-ID: <5255E701.9050100@gmail.com> (raw)
In-Reply-To: <5255C91B.7030608@zytor.com>

On 10/10/2013 05:22 AM, H. Peter Anvin wrote:
> On 10/09/2013 02:19 PM, Zhang Yanfei wrote:
>>>
>>> Yeah, I was referring to the 16MB limit, which apparently ceased to
>>> exist.
>>
>> Hmmmm...If we are talking 16MB limit hear, I don't think it a problem, either.
>> Currently, default loading & running address of kernel is 16MB, so the
>> kernel itself is above 16MB, memory allocated in bottom-up mode is obviously
>> above the 16MB. Just seeing from a RHEL6.3 server:
>>
>>   01000000-01507ff4 : Kernel code
>>   01507ff5-01c07b2f : Kernel data
>>   01d4e000-02012023 : Kernel bss
>>
>> IOW, even if kernel is loaded and running at 1MB, it self will occupy about
>> 16MB from the above.
>>
> 
> For various DMA devices you can find almost every possible power of 2
> being a limitation.  The most common limits are 24, 32, and 40 bits, but
> you also see odd ones like 30 bits in the field.  Really.
> 

Thanks for this.

I was always curious about what the limit is when we said DMA limit before.

-- 
Thanks.
Zhang Yanfei

--
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WARNING: multiple messages have this Message-ID (diff)
From: Zhang Yanfei <zhangyanfei.yes@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>,
	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: Thu, 10 Oct 2013 07:30:09 +0800	[thread overview]
Message-ID: <5255E701.9050100@gmail.com> (raw)
In-Reply-To: <5255C91B.7030608@zytor.com>

On 10/10/2013 05:22 AM, H. Peter Anvin wrote:
> On 10/09/2013 02:19 PM, Zhang Yanfei wrote:
>>>
>>> Yeah, I was referring to the 16MB limit, which apparently ceased to
>>> exist.
>>
>> Hmmmm...If we are talking 16MB limit hear, I don't think it a problem, either.
>> Currently, default loading & running address of kernel is 16MB, so the
>> kernel itself is above 16MB, memory allocated in bottom-up mode is obviously
>> above the 16MB. Just seeing from a RHEL6.3 server:
>>
>>   01000000-01507ff4 : Kernel code
>>   01507ff5-01c07b2f : Kernel data
>>   01d4e000-02012023 : Kernel bss
>>
>> IOW, even if kernel is loaded and running at 1MB, it self will occupy about
>> 16MB from the above.
>>
> 
> For various DMA devices you can find almost every possible power of 2
> being a limitation.  The most common limits are 24, 32, and 40 bits, but
> you also see odd ones like 30 bits in the field.  Really.
> 

Thanks for this.

I was always curious about what the limit is when we said DMA limit before.

-- 
Thanks.
Zhang Yanfei

--
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>

  reply	other threads:[~2013-10-09 23:30 UTC|newest]

Thread overview: 109+ 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  1:56 ` Zhang Yanfei
2013-10-04  1:57 ` [PATCH part1 v6 1/6] memblock: Factor out of top-down allocation Zhang Yanfei
2013-10-04  1:57   ` Zhang Yanfei
2013-10-04  1:58 ` [PATCH part1 v6 2/6] memblock: Introduce bottom-up allocation mode Zhang Yanfei
2013-10-04  1:58   ` Zhang Yanfei
2013-10-05 21:30   ` Toshi Kani
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  1:59   ` Zhang Yanfei
2013-10-04  2:00 ` [PATCH part1 v6 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up Zhang Yanfei
2013-10-04  2:00   ` Zhang Yanfei
2013-10-05 22:09   ` Toshi Kani
2013-10-05 22:09     ` Toshi Kani
2013-10-07  0:00   ` H. Peter Anvin
2013-10-07  0:00     ` H. Peter Anvin
2013-10-07 14:17     ` Zhang Yanfei
2013-10-07 14:17       ` Zhang Yanfei
2013-10-08 17:36     ` Zhang Yanfei
2013-10-08 17:36       ` Zhang Yanfei
2013-10-08 17:36       ` Zhang Yanfei
2013-10-09 16:44       ` Tejun Heo
2013-10-09 16:44         ` Tejun Heo
2013-10-09 17:14         ` Zhang Yanfei
2013-10-09 17:14           ` Zhang Yanfei
2013-10-09 19:20           ` Tejun Heo
2013-10-09 19:20             ` Tejun Heo
2013-10-09 19:30             ` Dave Hansen
2013-10-09 19:30               ` Dave Hansen
2013-10-09 19:47               ` Tejun Heo
2013-10-09 19:47                 ` Tejun Heo
2013-10-09 20:58             ` Toshi Kani
2013-10-09 20:58               ` Toshi Kani
2013-10-09 21:11               ` Tejun Heo
2013-10-09 21:11                 ` Tejun Heo
2013-10-09 21:14                 ` H. Peter Anvin
2013-10-09 21:14                   ` H. Peter Anvin
2013-10-09 21:45                   ` Zhang Yanfei
2013-10-09 21:45                     ` Zhang Yanfei
2013-10-09 23:10                     ` H. Peter Anvin
2013-10-09 23:10                       ` H. Peter Anvin
2013-10-09 23:26                       ` Zhang Yanfei
2013-10-09 23:26                         ` Zhang Yanfei
2013-10-10  1:20                         ` Zhang Yanfei
2013-10-10  1:20                           ` Zhang Yanfei
2013-10-10  1:20                           ` Zhang Yanfei
2013-10-10  0:25                   ` Toshi Kani
2013-10-10  0:25                     ` Toshi Kani
2013-10-09 23:58                 ` Toshi Kani
2013-10-09 23:58                   ` Toshi Kani
2013-10-10  1:00                   ` Tejun Heo
2013-10-10  1:00                     ` Tejun Heo
2013-10-10 14:36                     ` Toshi Kani
2013-10-10 14:36                       ` Toshi Kani
2013-10-10 15:35                       ` Tejun Heo
2013-10-10 15:35                         ` Tejun Heo
2013-10-10 16:24                         ` Toshi Kani
2013-10-10 16:24                           ` Toshi Kani
2013-10-10 16:46                           ` Tejun Heo
2013-10-10 16:46                             ` Tejun Heo
2013-10-10 16:50                             ` Toshi Kani
2013-10-10 16:50                               ` Toshi Kani
2013-10-10 16:55                               ` Tejun Heo
2013-10-10 16:55                                 ` Tejun Heo
2013-10-10 16:59                                 ` Toshi Kani
2013-10-10 16:59                                   ` Toshi Kani
2013-10-10 17:12                                   ` H. Peter Anvin
2013-10-10 17:12                                     ` H. Peter Anvin
2013-10-10 19:17                                     ` Toshi Kani
2013-10-10 19:17                                       ` Toshi Kani
2013-10-10 22:19                                       ` Tejun Heo
2013-10-10 22:19                                         ` Tejun Heo
2013-10-10 23:00                                         ` Toshi Kani
2013-10-10 23:00                                           ` Toshi Kani
2013-10-09 21:19             ` Zhang Yanfei
2013-10-09 21:19               ` Zhang Yanfei
2013-10-09 21:22               ` H. Peter Anvin
2013-10-09 21:22                 ` H. Peter Anvin
2013-10-09 23:30                 ` Zhang Yanfei [this message]
2013-10-09 23:30                   ` Zhang Yanfei
2013-10-09 19:10         ` Yinghai Lu
2013-10-09 19:10           ` Yinghai Lu
2013-10-09 19:23           ` Tejun Heo
2013-10-09 19:23             ` Tejun Heo
2013-10-11  5:27             ` Yinghai Lu
2013-10-11  5:27               ` Yinghai Lu
2013-10-11  5:47               ` Zhang Yanfei
2013-10-11  5:47                 ` Zhang Yanfei
2013-10-11  6:33                 ` Ingo Molnar
2013-10-11  6:33                   ` Ingo Molnar
2013-10-11  6:46                   ` Zhang Yanfei
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
2013-10-04  2:01   ` Zhang Yanfei
2013-10-05 22:10   ` Toshi Kani
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
2013-10-04  2:02   ` Zhang Yanfei
2013-10-05 22:28   ` Toshi Kani
2013-10-05 22:28     ` Toshi Kani
2013-10-06 14:43     ` [PATCH part1 v6 update " Zhang Yanfei
2013-10-06 14:43       ` Zhang Yanfei
2013-10-06 14:43       ` Zhang Yanfei
2013-10-06 23:03       ` Toshi Kani
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  4:23   ` Ingo Molnar
2013-10-08 15:28   ` Zhang Yanfei
2013-10-08 15:28     ` Zhang Yanfei

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