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: Tue, 10 Sep 2013 07:58:00 +0800 [thread overview]
Message-ID: <20130909235800.GA30121@hacker.(null)> (raw)
In-Reply-To: <20130909135815.GB25434@htj.dyndns.org>
Hi Tejun,
On Mon, Sep 09, 2013 at 09:58:15AM -0400, Tejun Heo wrote:
>Hello,
>
>On Mon, Sep 09, 2013 at 07:56:34PM +0800, Wanpeng Li wrote:
>> If allocate from low to high as what this patchset done will occupy the
>> precious memory you mentioned?
>
>Yeah, and that'd be the reason why this behavior is dependent on a
>kernel option. That said, allocating some megs on top of kernel isn't
>a big deal. The wretched ISA DMA is mostly gone now and some megs
>isn't gonna hurt 32bit DMAs in any noticeable way. I wouldn't be too
>surprised if nobody notices after switching the default behavior to
>allocate early mem close to kernel. Maybe the only case which might
>be impacted is 32bit highmem configs, but they're messed up no matter
>what anyway and even they shouldn't be affected noticeably if large
>mapping is in use.
ISA DMA is still survive for 32bit highmem configs. In my desktop:
c1000000 T _text => 16MB
c1d09000 B _end => 29MB
This patchset will alloc after 29MB. ;-)
Regards,
Wanpeng Li
>
>Thanks.
>
>--
>tejun
--
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:[~2013-09-09 23:58 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
2013-09-05 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
2013-08-27 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 8:03 ` Wanpeng Li
2013-08-28 9:34 ` Tang Chen
2013-08-28 15:19 ` Tejun Heo
2013-08-29 1:30 ` Tang Chen
2013-08-29 1:36 ` Wanpeng Li
2013-08-29 1:36 ` Wanpeng Li
2013-08-29 1:53 ` Tang Chen
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
[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 [this message]
2013-09-09 23:58 ` Wanpeng Li
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='20130909235800.GA30121@hacker.(null)' \
--to=liwanp@linux.vnet.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=gong.chen@linux.intel.com \
--cc=hpa@zytor.com \
--cc=isimatu.yasuaki@jp.fujitsu.com \
--cc=izumi.taku@jp.fujitsu.com \
--cc=jiang.liu@huawei.com \
--cc=jweiner@redhat.com \
--cc=laijs@cn.fujitsu.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lwoodman@redhat.com \
--cc=mgorman@suse.de \
--cc=mina86@mina86.com \
--cc=minchan@kernel.org \
--cc=mingo@elte.hu \
--cc=prarit@redhat.com \
--cc=riel@redhat.com \
--cc=rjw@sisk.pl \
--cc=tglx@linutronix.de \
--cc=tj@kernel.org \
--cc=trenn@suse.de \
--cc=vasilis.liaskovitis@profitbricks.com \
--cc=wency@cn.fujitsu.com \
--cc=x86@kernel.org \
--cc=yinghai@kernel.org \
--cc=zhangyanfei@cn.fujitsu.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox