linux-kernel - RE: [RFC PATCH v2 04/11] pstore: Add compression support to pstore

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Message-ID: <A5ED84D3BB3A384992CBB9C77DEDA4D443E8F1E2@USINDEM103.corp.hds.com>
Date:	Thu, 22 Aug 2013 23:47:02 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	"Luck, Tony" <tony.luck@...el.com>,
	Aruna Balakrishnaiah <aruna@...ux.vnet.ibm.com>,
	"linuxppc-dev@...abs.org" <linuxppc-dev@...abs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"keescook@...omium.org" <keescook@...omium.org>
CC:	"jkenisto@...ux.vnet.ibm.com" <jkenisto@...ux.vnet.ibm.com>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"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 04/11] pstore: Add compression support to pstore



> -----Original Message-----
> From: Luck, Tony [mailto:tony.luck@...el.com]
> Sent: Thursday, August 22, 2013 7:17 PM
> To: Seiji Aguchi; Aruna Balakrishnaiah; linuxppc-dev@...abs.org; 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: RE: [RFC PATCH v2 04/11] pstore: Add compression support to pstore
> 
> <1>[  383.209057] RIP  [<ffffffff813d3946>] sysrq_handle_crash+0x16/0x20
> <4>[  383.209057]  RSP <ffff88006f551e80>
> <4>[  383.209057] CR2: 0000000000000000
> <4>[  383.209057] ---[ end trace 04a1cddad37b4b33 ]---
> <3>[  383.209057] pstore: compression failed for Part 2 returned -5
> <3>[  383.209057] pstore: Capture uncompressed oops/panic report of Part 2
> <3>[  383.209057] pstore: compression failed for Part 5 returned -5
> 
> Interesting.  With ERST backend I didn't see these messages.  Traces in
> pstore recovered files go as far as the line before the "---[ end trace 04a1cddad37b4b33 ]---"
> 
> Why the difference depending on which back end is in use?

I think the difference doesn't depend on the back end.
Rather it depends on the environment.

I tested on a kvm guest with OVMF.

Seiji


> 
> But I agree that we shouldn't have these messages.  They use up space
> in the persistent store that could be better used saving some more lines
> from earlier in the console log.
> 
> -Tony