linux-kernel - Re: [PATCH v8 9/9] vmcore: support mmap() on /proc/vmcore

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Message-ID: <51B1332E.4030907@cn.fujitsu.com>
Date:	Fri, 07 Jun 2013 09:11:10 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	Maxim Uvarov <muvarov@...il.com>
CC:	Atsushi Kumagai <kumagai-atsushi@....nes.nec.co.jp>,
	riel@...hat.com,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	hughd@...gle.com, linux-kernel@...r.kernel.org,
	lisa.mitchell@...com, Vivek Goyal <vgoyal@...hat.com>,
	linux-mm@...ck.org, HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>, walken@...gle.com,
	Cliff Wickman <cpw@....com>, jingbai.ma@...com
Subject: Re: [PATCH v8 9/9] vmcore: support mmap() on /proc/vmcore

On 06/04/2013 11:34 PM, Maxim Uvarov wrote:
> 
> 
> 
> 2013/6/3 Atsushi Kumagai <kumagai-atsushi@....nes.nec.co.jp <mailto:kumagai-atsushi@....nes.nec.co.jp>>
> 
>     Hello Maxim,
> 
>     On Thu, 30 May 2013 14:30:01 +0400
>     Maxim Uvarov <muvarov@...il.com <mailto:muvarov@...il.com>> wrote:
> 
>     > 2013/5/30 Zhang Yanfei <zhangyanfei@...fujitsu.com <mailto:zhangyanfei@...fujitsu.com>>
>     >
>     > > On 05/30/2013 05:14 PM, Maxim Uvarov wrote:
>     > > >
>     > > >
>     > > >
>     > > > 2013/5/27 HATAYAMA Daisuke <d.hatayama@...fujitsu.com <mailto:d.hatayama@...fujitsu.com> <mailto:
>     > > d.hatayama@...fujitsu.com <mailto:d.hatayama@...fujitsu.com>>>
>     > > >
>     > > >     (2013/05/24 18:02), Maxim Uvarov wrote:
>     > > >
>     > > >
>     > > >
>     > > >
>     > > >         2013/5/24 Andrew Morton <akpm@...ux-foundation.org <mailto:akpm@...ux-foundation.org> <mailto:
>     > > akpm@...ux-foundation.org <mailto:akpm@...ux-foundation.org>> <mailto:akpm@...ux-foundation. <mailto:akpm@...ux-foundation.>__org <mailto:
>     > > akpm@...ux-foundation.org <mailto:akpm@...ux-foundation.org>>>>
>     > > >
>     > > >
>     > > >             On Thu, 23 May 2013 14:25:48 +0900 HATAYAMA Daisuke <
>     > > d.hatayama@...fujitsu.com <mailto:d.hatayama@...fujitsu.com> <mailto:d.hatayama@...fujitsu.com <mailto:d.hatayama@...fujitsu.com>> <mailto:
>     > > d.hatayama@...fujitsu.__com <mailto:d.hatayama@...fujitsu.com <mailto:d.hatayama@...fujitsu.com>>>> wrote:
>     > > >
>     > > >              > This patch introduces mmap_vmcore().
>     > > >              >
>     > > >              > Don't permit writable nor executable mapping even with
>     > > mprotect()
>     > > >              > because this mmap() is aimed at reading crash dump memory.
>     > > >              > Non-writable mapping is also requirement of
>     > > remap_pfn_range() when
>     > > >              > mapping linear pages on non-consecutive physical pages;
>     > > see
>     > > >              > is_cow_mapping().
>     > > >              >
>     > > >              > Set VM_MIXEDMAP flag to remap memory by remap_pfn_range
>     > > and by
>     > > >              > remap_vmalloc_range_pertial at the same time for a single
>     > > >              > vma. do_munmap() can correctly clean partially remapped
>     > > vma with two
>     > > >              > functions in abnormal case. See zap_pte_range(),
>     > > vm_normal_page() and
>     > > >              > their comments for details.
>     > > >              >
>     > > >              > On x86-32 PAE kernels, mmap() supports at most 16TB
>     > > memory only. This
>     > > >              > limitation comes from the fact that the third argument of
>     > > >              > remap_pfn_range(), pfn, is of 32-bit length on x86-32:
>     > > unsigned long.
>     > > >
>     > > >             More reviewing and testing, please.
>     > > >
>     > > >
>     > > >         Do you have git pull for both kernel and userland changes? I
>     > > would like to do some more testing on my machines.
>     > > >
>     > > >         Maxim.
>     > > >
>     > > >
>     > > >     Thanks! That's very helpful.
>     > > >
>     > > >     --
>     > > >     Thanks.
>     > > >     HATAYAMA, Daisuke
>     > > >
>     > > > Any update for this? Where can I checkout all sources?
>     > >
>     > > This series is now in Andrew Morton's -mm tree.
>     > >
>     > > Ok, and what about makedumpfile changes? Is it possible to fetch them from
>     > somewhere?
> 
>     You can fetch them from here, "mmap" branch is the change:
> 
>       git://git.code.sf.net/p/makedumpfile/code <http://git.code.sf.net/p/makedumpfile/code>
> 
>     And they will be merged into v1.5.4.
> 
> 
> thank you, got it. But still do not see kernel patches in akpm tree:
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> http://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> 
> 
> Should I look at different branch?

Now it is merged into the next tree you list above. See the commit:

author	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>	2013-06-06 00:40:01 (GMT)
committer	Stephen Rothwell <sfr@...b.auug.org.au>	2013-06-06 05:50:03 (GMT)
commit	4be2c06c30e4c3994d86e0be24ff1af12d2c71d5 (patch)
tree	d7fb8c64c628600e8ba24481927f087fc11c2986
parent	99f80952861807e521ed30c22925f009f543a5ec (diff)

-- 
Thanks.
Zhang Yanfei
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