linux-kernel - Re: [RFC PATCH v2 06/11] pstore: Add decompression support to pstore

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Date:	Tue, 27 Aug 2013 15:09:35 +0530
From:	Aruna Balakrishnaiah <aruna@...ux.vnet.ibm.com>
To:	Seiji Aguchi <seiji.aguchi@....com>
CC:	"linuxppc-dev@...abs.org" <linuxppc-dev@...abs.org>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"jkenisto@...ux.vnet.ibm.com" <jkenisto@...ux.vnet.ibm.com>,
	"cbouatmailru@...il.com" <cbouatmailru@...il.com>,
	"mahesh@...ux.vnet.ibm.com" <mahesh@...ux.vnet.ibm.com>,
	"ccross@...roid.com" <ccross@...roid.com>
Subject: Re: [RFC PATCH v2 06/11] pstore: Add decompression support to pstore

On Friday 23 August 2013 04:34 AM, Seiji Aguchi wrote:
>
>> -----Original Message-----
>> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-owner@...r.kernel.org] On Behalf Of Aruna Balakrishnaiah
>> Sent: Friday, August 16, 2013 9:18 AM
>> To: linuxppc-dev@...abs.org; tony.luck@...el.com; linux-kernel@...r.kernel.org; keescook@...omium.org
>> Cc: jkenisto@...ux.vnet.ibm.com; ananth@...ibm.com; benh@...nel.crashing.org; cbouatmailru@...il.com;
>> mahesh@...ux.vnet.ibm.com; ccross@...roid.com
>> Subject: [RFC PATCH v2 06/11] pstore: Add decompression support to pstore
>>
>> Based on the flag 'compressed' set or not, pstore will decompress the
>> data returning a plain text file. If decompression fails for a particular
>> record it will have the compressed data in the file which can be
>> decompressed with 'openssl' command line tool.
> If the decompression fails and openssl doesn't work, the worst case is that users can't read the entry.
> In that case, pstore is meaningless at all.

If decompression fails and openssl doesn't work. We have python module zlib to 
decompress
the zlib data. zlib.decompress() should do the trick.

> Also, for users who want to get a single panic message, a compression is not needed.
>
> So, I think we still have to support non-compression mode.
> (IMO, pstore can take kdump as a model. Kdump supports both compression and non-compression mode.)
>
> But, if you think my comment is outside this patchset, it's OK.
> We can make it with a separate patch.
>
> Seiji
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
>

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