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SubjectRe: [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@mxc.nes.nec.co.jp <mailto:kumagai-atsushi@mxc.nes.nec.co.jp>>
>
> Hello Maxim,
>
> On Thu, 30 May 2013 14:30:01 +0400
> Maxim Uvarov <muvarov@gmail.com <mailto:muvarov@gmail.com>> wrote:
>
> > 2013/5/30 Zhang Yanfei <zhangyanfei@cn.fujitsu.com <mailto:zhangyanfei@cn.fujitsu.com>>
> >
> > > On 05/30/2013 05:14 PM, Maxim Uvarov wrote:
> > > >
> > > >
> > > >
> > > > 2013/5/27 HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com <mailto:d.hatayama@jp.fujitsu.com> <mailto:
> > > d.hatayama@jp.fujitsu.com <mailto:d.hatayama@jp.fujitsu.com>>>
> > > >
> > > > (2013/05/24 18:02), Maxim Uvarov wrote:
> > > >
> > > >
> > > >
> > > >
> > > > 2013/5/24 Andrew Morton <akpm@linux-foundation.org <mailto:akpm@linux-foundation.org> <mailto:
> > > akpm@linux-foundation.org <mailto:akpm@linux-foundation.org>> <mailto:akpm@linux-foundation. <mailto:akpm@linux-foundation.>__org <mailto:
> > > akpm@linux-foundation.org <mailto:akpm@linux-foundation.org>>>>
> > > >
> > > >
> > > > On Thu, 23 May 2013 14:25:48 +0900 HATAYAMA Daisuke <
> > > d.hatayama@jp.fujitsu.com <mailto:d.hatayama@jp.fujitsu.com> <mailto:d.hatayama@jp.fujitsu.com <mailto:d.hatayama@jp.fujitsu.com>> <mailto:
> > > d.hatayama@jp.fujitsu.__com <mailto:d.hatayama@jp.fujitsu.com <mailto:d.hatayama@jp.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@jp.fujitsu.com> 2013-06-06 00:40:01 (GMT)
committer Stephen Rothwell <sfr@canb.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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