From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp08.au.ibm.com (e23smtp08.au.ibm.com [202.81.31.141]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp08.au.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id C78A52C0495 for ; Mon, 24 Jun 2013 16:22:59 +1000 (EST) Received: from /spool/local by e23smtp08.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 24 Jun 2013 16:20:11 +1000 Received: from d23relay04.au.ibm.com (d23relay04.au.ibm.com [9.190.234.120]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 8261A3578052 for ; Mon, 24 Jun 2013 16:22:53 +1000 (EST) Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r5O685Wj37814498 for ; Mon, 24 Jun 2013 16:08:05 +1000 Received: from d23av02.au.ibm.com (loopback [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r5O6Mo6x021311 for ; Mon, 24 Jun 2013 16:22:52 +1000 Subject: [RESEND PATCH 0/3] Nvram-to-pstore: compression support for oops data To: linuxppc-dev@ozlabs.org, paulus@samba.org, linux-kernel@vger.kernel.org, benh@kernel.crashing.org From: Aruna Balakrishnaiah Date: Mon, 24 Jun 2013 11:52:46 +0530 Message-ID: <20130624061936.12963.72529.stgit@aruna-ThinkPad-T420> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: jkenisto@linux.vnet.ibm.com, tony.luck@intel.com, mahesh@linux.vnet.ibm.com, cbouatmailru@gmail.com, anton@samba.org, ccross@android.com, keescook@chromium.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The patchset takes care of compressing oops messages while writing to NVRAM, so that more oops data can be captured in the given space. big_oops_buf (2.22 * oops_data_sz) is allocated for compression. oops_data_sz is oops header size less of oops partition size. Pstore will internally call kmsg_dump to capture messages from printk buffer. While returning the data to nvram it adds is own header. For compression: Register pstore with big_oops_buf. In case compression fails, copy header added by pstore and last oops_data_sz bytes (recent messages) of big_oops_buf to nvram for which we need to know header size. patch 01/03 will add a function in pstore to return the header size. pstore read callback of nvram will read the compressed data and return the decompressed data so that dmesg file (under /dev/pstore) is readable. In case decompression fails, instead of having the compressed data (junk) in the dmesg file it will skip and continue reading other partitions. This results in absence of dmesg file but will still have files relating to other parititons. --- Aruna Balakrishnaiah (3): Retreive header size from pstore powerpc/pseries: Re-organise the oops compression code powerpc/pseries: Support compression of oops text via pstore arch/powerpc/platforms/pseries/nvram.c | 236 +++++++++++++++++++++++--------- fs/pstore/platform.c | 7 + include/linux/pstore.h | 6 + 3 files changed, 182 insertions(+), 67 deletions(-) --