linux-kernel - Re: [PATCH v2] ramoops: use pstore interface

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Date:	Fri, 02 Dec 2011 10:40:56 +0800
From:	Chen Gong <gong.chen@...ux.intel.com>
To:	Marco Stornelli <marco.stornelli@...il.com>
CC:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org,
	Tony Luck <tony.luck@...il.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] ramoops: use pstore interface

于 2011/12/1 18:31, Marco Stornelli 写道:
> Il 29/11/2011 18:24, Kees Cook ha scritto:
>> On Mon, Nov 28, 2011 at 8:50 PM, Chen Gong<gong.chen@...ux.intel.com> wrote:
>>> 于 2011/11/29 4:09, Kees Cook 写道:
>>>>
>>>> Instead of using /dev/mem directly, use the common pstore infrastructure
>>>> to handle Oops gathering and extraction.
>>>>
>>>> Signed-off-by: Kees Cook<keescook@...omium.org>
>>>> ---
>>>> This depends on the pstore changes waiting for -next in:
>>>>
>>>> http://git.kernel.org/?p=linux/kernel/git/aegl/linux.git;a=shortlog;h=refs/heads/next
>>>>
>>>> ---
>>>> Documentation/ramoops.txt | 8 +-
>>>> drivers/char/Kconfig | 1 +
>>>> drivers/char/ramoops.c | 206
>>>> ++++++++++++++++++++++++++++++++++-----------
>>>> 3 files changed, 160 insertions(+), 55 deletions(-)
>>>>
>>>> diff --git a/Documentation/ramoops.txt b/Documentation/ramoops.txt
>>>> index 8fb1ba7..a0b9d8e 100644
>>>> --- a/Documentation/ramoops.txt
>>>> +++ b/Documentation/ramoops.txt
>>>> @@ -3,7 +3,7 @@ Ramoops oops/panic logger
>>>>
>>>> Sergiu Iordache<sergiu@...omium.org>
>>>>
>>>> -Updated: 8 August 2011
>>>> +Updated: 17 November 2011
>>>>
>>>> 0. Introduction
>>>>
>>>> @@ -71,6 +71,6 @@ timestamp and a new line. The dump then continues with
>>>> the actual data.
>>>>
>>>> 4. Reading the data
>>>>
>>>> -The dump data can be read from memory (through /dev/mem or other means).
>>>> -Getting the module parameters, which are needed in order to parse the
>>>> data, can
>>>> -be done through /sys/module/ramoops/parameters/* .
>>>> +The dump data can be read from the pstore filesystem. The format for
>>>> these
>>>> +files is "dmesg-ramoops-N", where N is the record number in memory. To
>>>> delete
>>>> +a stored record from RAM, simply unlink the respective pstore file.
>>>
>>> I think the definition of "mem_address" in the doc is not very clear. It is
>>> not a normal memory instead of a persistent RAM. I suggest adding more
>>> descriptions.
>>> It's better if there is a real example.
>>
>> Okay. I'm not sure it's in the scope of this patch, but I can try.
>>
>> Marco, do you have suggestions for how this could be enhanced?
>>
>
> I don't know actually. It's not mandatory use a persistent memory. A simple
> piece of reserved RAM is ok. Obviously it will work only over reboot and not
> over power down. I define mem_address as a generic piece of reserved memory.
>
> Marco

Anyway, we need a pratical exmaple to instruct us how to use this diver.

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