From: Wanpeng Li <liwanp@linux.vnet.ibm.com>
To: Tejun Heo <tj@kernel.org>
Cc: rjw@sisk.pl, lenb@kernel.org, tglx@linutronix.de, mingo@elte.hu,
hpa@zytor.com, akpm@linux-foundation.org, trenn@suse.de,
yinghai@kernel.org, jiang.liu@huawei.com, wency@cn.fujitsu.com,
laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com,
izumi.taku@jp.fujitsu.com, mgorman@suse.de, minchan@kernel.org,
mina86@mina86.com, gong.chen@linux.intel.com,
vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com,
riel@redhat.com, jweiner@redhat.com, prarit@redhat.com,
zhangyanfei@cn.fujitsu.com, x86@kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH 00/11] x86, memblock: Allocate memory near kernel image before SRAT parsed.
Date: Fri, 6 Sep 2013 16:58:11 +0800 [thread overview]
Message-ID: <20130906085811.GA31315@hacker.(null)> (raw)
In-Reply-To: <20130904192215.GG26609@mtj.dyndns.org>
Hi Tejun,
On Wed, Sep 04, 2013 at 03:22:15PM -0400, Tejun Heo wrote:
>Hello,
>
>On Tue, Aug 27, 2013 at 05:37:37PM +0800, Tang Chen wrote:
>> 1. Make memblock be able to allocate memory from low address to high address.
>> Also introduce low limit to prevent memblock allocating memory too low.
>>
>> 2. Improve init_mem_mapping() to support allocate page tables from low address
>> to high address.
>>
>> 3. Introduce "movablenode" boot option to enable and disable this functionality.
>>
>> PS: Reordering of relocate_initrd() and reserve_crashkernel() has not been done
>> yet. acpi_initrd_override() needs to access initrd with virtual address. So
>> relocate_initrd() must be done before acpi_initrd_override().
>
>I'm expectedly happier with this approach but some overall review
>points.
>
>* I think patch splitting went a bit too far. e.g. it doesn't make
> much sense or helps anything to split "introduction of a param" from
> "the param doing something".
>
>* I think it's a lot more complex than necessary. Just implement a
> single function - memblock_alloc_bottom_up(@start) where specifying
> MEMBLOCK_ALLOC_ANYWHERE restores top down behavior and do
> memblock_alloc_bottom_up(end_of_kernel) early during boot. If the
> bottom up mode is set, just try allocating bottom up from the
> specified address and if that fails do normal top down allocation.
> No need to meddle with the callers. The only change necessary
> (well, aside from the reordering) outside memblock is adding two
> calls to the above function.
>
>* I don't think "order" is the right word here. "direction" probably
> fits a lot better.
What's the root reason memblock alloc from high to low? To reduce
fragmentation or ...
Regards,
Wanpeng Li
>
>Thanks.
>
>--
>tejun
>
>--
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next prev parent reply other threads:[~2013-09-06 8:58 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-27 9:37 Tang Chen
2013-08-27 9:37 ` [PATCH 01/11] memblock: Rename current_limit to current_limit_high in memblock Tang Chen
2013-08-27 9:37 ` [PATCH 02/11] memblock: Rename memblock_set_current_limit() to memblock_set_current_limit_high() Tang Chen
2013-08-27 9:37 ` [PATCH 03/11] memblock: Introduce lowest limit in memblock Tang Chen
2013-08-27 9:37 ` [PATCH 04/11] memblock: Introduce memblock_set_current_limit_low() to set lower limit of memblock Tang Chen
2013-08-27 9:37 ` [PATCH 05/11] memblock: Introduce allocation order to memblock Tang Chen
2013-09-05 9:16 ` Wanpeng Li
2013-09-05 9:16 ` Wanpeng Li
2013-09-05 9:21 ` Tang Chen
2013-09-05 9:27 ` Wanpeng Li
2013-09-05 9:27 ` Wanpeng Li
2013-08-27 9:37 ` [PATCH 06/11] memblock: Improve memblock to support allocation from lower address Tang Chen
2013-09-04 0:24 ` Toshi Kani
2013-09-04 1:00 ` Tang Chen
2013-08-27 9:37 ` [PATCH 07/11] x86, memblock: Set lowest limit for memblock_alloc_base_nid() Tang Chen
2013-09-04 0:37 ` Toshi Kani
2013-09-04 2:05 ` Tang Chen
2013-09-04 15:22 ` Toshi Kani
2013-08-27 9:37 ` [PATCH 08/11] x86, acpi, memblock: Use __memblock_alloc_base() in acpi_initrd_override() Tang Chen
2013-08-28 0:04 ` Rafael J. Wysocki
2013-08-27 9:37 ` [PATCH 09/11] mem-hotplug: Introduce movablenode boot option to {en|dis}able using SRAT Tang Chen
2013-08-27 9:37 ` [PATCH 10/11] x86, mem-hotplug: Support initialize page tables from low to high Tang Chen
2013-09-05 13:30 ` Wanpeng Li
2013-09-06 1:34 ` Tang Chen
2013-09-06 2:16 ` Wanpeng Li
2013-09-06 3:09 ` Tang Chen
2013-09-06 2:16 ` Wanpeng Li
2013-09-05 13:30 ` Wanpeng Li
2013-08-27 9:37 ` [PATCH 11/11] x86, mem_hotplug: Allocate memory near kernel image before SRAT is parsed Tang Chen
2013-09-04 19:40 ` Toshi Kani
2013-08-28 8:03 ` [PATCH 00/11] x86, memblock: Allocate memory near kernel image before SRAT parsed Wanpeng Li
2013-08-28 9:34 ` Tang Chen
2013-08-28 8:03 ` Wanpeng Li
2013-08-28 15:19 ` Tejun Heo
2013-08-29 1:30 ` Tang Chen
2013-08-29 1:36 ` Wanpeng Li
2013-08-29 1:53 ` Tang Chen
2013-08-29 1:36 ` Wanpeng Li
2013-09-02 1:03 ` Tang Chen
2013-09-04 19:22 ` Tejun Heo
2013-09-05 9:01 ` Tang Chen
2013-09-06 8:58 ` Wanpeng Li
2013-09-06 8:58 ` Wanpeng Li [this message]
[not found] ` <52299935.0302450a.26c9.ffffb240SMTPIN_ADDED_BROKEN@mx.google.com>
2013-09-06 15:15 ` Tejun Heo
2013-09-06 15:47 ` H. Peter Anvin
2013-09-09 12:04 ` Wanpeng Li
2013-09-09 12:04 ` Wanpeng Li
2013-09-09 11:56 ` Wanpeng Li
2013-09-09 11:56 ` Wanpeng Li
[not found] ` <522db781.22ab440a.41b1.ffffd825SMTPIN_ADDED_BROKEN@mx.google.com>
2013-09-09 13:58 ` Tejun Heo
2013-09-09 23:58 ` Wanpeng Li
2013-09-09 23:58 ` Wanpeng Li
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