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Wed, 7 Apr 2021 14:28:27 +0000 (GMT) Received: from b03ledav002.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EEF53136059; Wed, 7 Apr 2021 14:28:26 +0000 (GMT) Received: from [9.211.151.211] (unknown [9.211.151.211]) by b03ledav002.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 7 Apr 2021 14:28:26 +0000 (GMT) Subject: Re: crashkernel reservation failed - No suitable area found on a cortina/gemini SoC To: Corentin Labbe Cc: ebiederm@xmission.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org References: <34ff1fcc-e9ee-02c2-b2a8-d98a24ce94c3@linux.vnet.ibm.com> From: Bruce Mitchell Message-ID: <7a75028b-4495-cd51-6a32-59fcf6e0f166@linux.vnet.ibm.com> Date: Wed, 7 Apr 2021 07:28:26 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Fsd95cWjD2O48rrRgmgW-41rNDBxb_MQ X-Proofpoint-GUID: 8sUaRUh8pg5OMgcZF1yEK4tJUpQpSuLw Content-Transfer-Encoding: 8bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-07_08:2021-04-07,2021-04-07 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 mlxlogscore=999 spamscore=0 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104070099 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/7/2021 07:23, Corentin Labbe wrote: > Le Wed, Apr 07, 2021 at 07:13:04AM -0700, Bruce Mitchell a écrit : >> On 4/7/2021 05:54, Corentin Labbe wrote: >>> Hello >>> >>> I try to do kexec on a cortina/gemini SoC. >>> On a "normal" boot, kexec fail to find memory so I added crashkernel=8M to cmdline. (kernel size is ~6M). >>> But now, kernel fail to reserve memory: >>> Load Kern image from 0x30020000 to 0x800000 size 7340032 >>> Booting Linux on physical CPU 0x0 >>> Linux version 5.12.0-rc5-next-20210401+ (compile@Red) (armv7a-unknown-linux-gnueabihf-gcc (Gentoo 9.3.0-r2 p4) 9.3.0, GNU ld (Gentoo 2.34 p6) 2.34.0) #98 PREEMPT Wed Apr 7 14:14:08 CEST 2021 >>> CPU: FA526 [66015261] revision 1 (ARMv4), cr=0000397f >>> CPU: VIVT data cache, VIVT instruction cache >>> OF: fdt: Machine model: Edimax NS-2502 >>> Memory policy: Data cache writeback >>> Zone ranges: >>> Normal [mem 0x0000000000000000-0x0000000007ffffff] >>> HighMem empty >>> Movable zone start for each node >>> Early memory node ranges >>> node 0: [mem 0x0000000000000000-0x0000000007ffffff] >>> Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff] >>> crashkernel reservation failed - No suitable area found. >>> Built 1 zonelists, mobility grouping on. Total pages: 32512 >>> Kernel command line: console=ttyS0,19200n8 ip=dhcp crashkernel=8M >>> Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear) >>> Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear) >>> mem auto-init: stack:off, heap alloc:off, heap free:off >>> Memory: 119476K/131072K available (5034K kernel code, 579K rwdata, 1372K rodata, 3020K init, 210K bss, 11596K reserved, 0K cma-reserved, 0K highmem) >>> SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 >>> >>> What can I do ? >>> >>> Thanks >>> Regards >>> >>> _______________________________________________ >>> kexec mailing list >>> kexec@lists.infradead.org >>> http://lists.infradead.org/mailman/listinfo/kexec >>> >> >> Hello Corentin, >> >> I see much larger crashkernel=xxM being shown here >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kdump/kdump.rst >> and from many of my other searches. >> >> Here is an interesting article on kdump for ARM-32 >> https://kaiwantech.wordpress.com/2017/07/13/setting-up-kdump-and-crash-for-arm-32-an-ongoing-saga/ >> >> >> Here is the kernel command line reference >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kernel-parameters.txt?h=v5.11#n732 >> >> I feel your frustrations too. > > Hello > > Thanks but I have already read those documentation. > I search to know why the kernel cannot find 8M of memory ouf of 128. > > Regards > How much more memory does the kernel and initrd above and beyond just their physical size? (heaps, stacks, buffers, virtual filesystems) From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lU9AW-0058rr-2W for kexec@lists.infradead.org; Wed, 07 Apr 2021 14:28:34 +0000 Subject: Re: crashkernel reservation failed - No suitable area found on a cortina/gemini SoC References: <34ff1fcc-e9ee-02c2-b2a8-d98a24ce94c3@linux.vnet.ibm.com> From: Bruce Mitchell Message-ID: <7a75028b-4495-cd51-6a32-59fcf6e0f166@linux.vnet.ibm.com> Date: Wed, 7 Apr 2021 07:28:26 -0700 In-Reply-To: Content-Language: en-US MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Corentin Labbe Cc: ebiederm@xmission.com, kexec@lists.infradead.org, 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