From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
To: Maxim Uvarov <muvarov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
riel@redhat.com, hughd@google.com, jingbai.ma@hp.com,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
linux-kernel@vger.kernel.org, lisa.mitchell@hp.com,
linux-mm@kvack.org,
Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>,
"Eric W. Biederman" <ebiederm@xmission.com>,
kosaki.motohiro@jp.fujitsu.com, zhangyanfei@cn.fujitsu.com,
walken@google.com, Cliff Wickman <cpw@sgi.com>,
Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH v8 9/9] vmcore: support mmap() on /proc/vmcore
Date: Mon, 27 May 2013 10:49:27 +0900 [thread overview]
Message-ID: <51A2BBA7.50607@jp.fujitsu.com> (raw)
In-Reply-To: <CAJGZr0LwivLTH+E7WAR1B9_6B4e=jv04KgCUL_PdVpi9JjDpBw@mail.gmail.com>
(2013/05/24 18:02), Maxim Uvarov wrote:
>
>
>
> 2013/5/24 Andrew Morton <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>> 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
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next prev parent reply other threads:[~2013-05-27 1:49 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-23 5:24 [PATCH v8 0/9] kdump, vmcore: support mmap() on /proc/vmcore HATAYAMA Daisuke
2013-05-23 5:25 ` [PATCH v8 1/9] vmcore: clean up read_vmcore() HATAYAMA Daisuke
2013-05-23 5:25 ` [PATCH v8 2/9] vmcore: allocate buffer for ELF headers on page-size alignment HATAYAMA Daisuke
2013-05-23 14:22 ` Vivek Goyal
2013-05-23 21:46 ` Andrew Morton
2013-05-23 5:25 ` [PATCH v8 3/9] vmcore: treat memory chunks referenced by PT_LOAD program header entries in page-size boundary in vmcore_list HATAYAMA Daisuke
2013-05-23 21:49 ` Andrew Morton
2013-05-24 13:12 ` Vivek Goyal
2013-05-27 0:13 ` HATAYAMA Daisuke
2013-05-23 5:25 ` [PATCH v8 4/9] vmalloc: make find_vm_area check in range HATAYAMA Daisuke
2013-05-23 5:25 ` [PATCH v8 5/9] vmalloc: introduce remap_vmalloc_range_partial HATAYAMA Daisuke
2013-05-23 22:00 ` Andrew Morton
2013-05-23 5:25 ` [PATCH v8 6/9] vmcore: allocate ELF note segment in the 2nd kernel vmalloc memory HATAYAMA Daisuke
2013-05-23 14:28 ` Vivek Goyal
2013-05-23 22:17 ` Andrew Morton
2013-05-23 5:25 ` [PATCH v8 7/9] vmcore: Allow user process to remap ELF note segment buffer HATAYAMA Daisuke
2013-05-23 14:32 ` Vivek Goyal
2013-05-23 5:25 ` [PATCH v8 8/9] vmcore: calculate vmcore file size from buffer size and total size of vmcore objects HATAYAMA Daisuke
2013-05-23 14:34 ` Vivek Goyal
2013-05-23 5:25 ` [PATCH v8 9/9] vmcore: support mmap() on /proc/vmcore HATAYAMA Daisuke
2013-05-23 22:24 ` Andrew Morton
2013-05-24 9:02 ` Maxim Uvarov
2013-05-27 1:49 ` HATAYAMA Daisuke [this message]
2013-05-30 9:14 ` Maxim Uvarov
2013-05-30 9:26 ` Zhang Yanfei
2013-05-30 10:30 ` Maxim Uvarov
2013-06-03 8:43 ` Atsushi Kumagai
2013-06-04 15:34 ` Maxim Uvarov
2013-06-07 1:11 ` Zhang Yanfei
2013-06-28 16:40 ` Maxim Uvarov
2013-06-30 23:53 ` HATAYAMA Daisuke
2013-07-01 14:34 ` Maxim Uvarov
2013-07-01 19:53 ` Andrew Morton
2013-07-02 7:00 ` Maxim Uvarov
2013-06-06 21:31 ` Arnd Bergmann
2013-06-07 1:01 ` HATAYAMA Daisuke
2013-06-07 18:34 ` Arnd Bergmann
2013-06-08 10:42 ` HATAYAMA Daisuke
2013-05-23 14:35 ` [PATCH v8 0/9] kdump, " Vivek Goyal
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