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

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Message-ID: <4ED75765.5020002@gmail.com>
Date:	Thu, 01 Dec 2011 11:31:01 +0100
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Kees Cook <keescook@...omium.org>
CC:	Chen Gong <gong.chen@...ux.intel.com>,
	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

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
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