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Mon, 27 Jan 2025 03:25:35 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 50R3PVUZ45613366 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 27 Jan 2025 03:25:31 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 58E26200BB; Mon, 27 Jan 2025 03:25:31 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BC5A7200B9; Mon, 27 Jan 2025 03:25:29 +0000 (GMT) Received: from [9.109.204.94] (unknown [9.109.204.94]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 27 Jan 2025 03:25:29 +0000 (GMT) Message-ID: <962804aa-bff5-4f19-8abb-80fd3060ba9c@linux.ibm.com> Date: Mon, 27 Jan 2025 08:55:28 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/4] Documentation/powerpc/fadump: add additional parameter feature details To: mahesh@linux.ibm.com Cc: linuxppc-dev@lists.ozlabs.org, Avnish Chouhan , Brian King , Hari Bathini , Madhavan Srinivasan , Michael Ellerman References: <20250123114254.200527-1-sourabhjain@linux.ibm.com> <20250123114254.200527-5-sourabhjain@linux.ibm.com> Content-Language: en-US From: Sourabh Jain In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: RCRZJo7wAhn-hrxd01s1qTwJl6rK8RJm X-Proofpoint-GUID: RCRZJo7wAhn-hrxd01s1qTwJl6rK8RJm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-27_01,2025-01-23_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 clxscore=1015 malwarescore=0 suspectscore=0 bulkscore=0 priorityscore=1501 mlxlogscore=999 mlxscore=0 phishscore=0 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501270022 Hello Mahesh, On 26/01/25 17:31, Mahesh J Salgaonkar wrote: > On 2025-01-23 17:12:54 Thu, Sourabh Jain wrote: >> Update the fadump document to include details about the fadump >> additional parameter feature. >> >> The document includes the following: >> - Significance of the feature >> - How to use it >> - Feature restrictions >> >> No functional changes are introduced. >> >> Cc: Avnish Chouhan >> Cc: Brian King >> Cc: Hari Bathini >> Cc: Madhavan Srinivasan >> Cc: Michael Ellerman >> Cc: Mahesh Salgaonkar >> Signed-off-by: Sourabh Jain >> --- >> Documentation/ABI/testing/sysfs-kernel-fadump | 3 ++- >> .../arch/powerpc/firmware-assisted-dump.rst | 22 +++++++++++++++++++ >> 2 files changed, 24 insertions(+), 1 deletion(-) >> >> diff --git a/Documentation/ABI/testing/sysfs-kernel-fadump b/Documentation/ABI/testing/sysfs-kernel-fadump >> index 2f9daa7ca55b..b64b7622e6fc 100644 >> --- a/Documentation/ABI/testing/sysfs-kernel-fadump >> +++ b/Documentation/ABI/testing/sysfs-kernel-fadump > [...] >> +-- Support for Additional Kernel Arguments in Fadump >> + Fadump has a feature that allows passing additional kernel arguments >> + to the fadump kernel. This feature was primarily designed to disable >> + kernel functionalities that are not required for the fadump kernel >> + and to reduce its memory footprint while collecting the dump. >> + >> + Command to Add Additional Kernel Parameters to Fadump: >> + e.g. >> + # echo "nr_cpus=16" > /sys/kernel/fadump/bootargs_append >> + >> + The above command is sufficient to add additional arguments to fadump. >> + An explicit service restart is not required. >> + >> + Command to Retrieve the Additional Fadump Arguments: >> + e.g. >> + # cat /sys/kernel/fadump/bootargs_append >> + >> +Note: Additional kernel arguments for fadump with HASH MMU is only >> + supported if the RMA size is greater than 768 MB. If the RMA >> + size is less than 768 MB, the kernel does not export the >> + /sys/kernel/fadump/bootargs_append sysfs node. > Reviewed-by: Mahesh Salgaonkar Thanks for the review. - Sourabh Jain