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

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Date:	Thu, 22 Aug 2013 23:17:10 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Seiji Aguchi <seiji.aguchi@....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

<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?

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