Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1What: /sys/kernel/kexec/*
2Date: Nov 2025
3Contact: kexec@lists.infradead.org
4Description:
5 The /sys/kernel/kexec/* directory contains sysfs files
6 that provide information about the configuration status
7 of kexec and kdump.
8
9What: /sys/kernel/kexec/loaded
10Date: Nov 2025
11Contact: kexec@lists.infradead.org
12Description: read only
13 Indicates whether a new kernel image has been loaded
14 into memory using the kexec system call. It shows 1 if
15 a kexec image is present and ready to boot, or 0 if none
16 is loaded.
17User: kexec tools, kdump service
18
19What: /sys/kernel/kexec/crash_loaded
20Date: Nov 2025
21Contact: kexec@lists.infradead.org
22Description: read only
23 Indicates whether a crash (kdump) kernel is currently
24 loaded into memory. It shows 1 if a crash kernel has been
25 successfully loaded for panic handling, or 0 if no crash
26 kernel is present.
27User: Kexec tools, Kdump service
28
29What: /sys/kernel/kexec/crash_size
30Date: Nov 2025
31Contact: kexec@lists.infradead.org
32Description: read/write
33 Shows the amount of memory reserved for loading the crash
34 (kdump) kernel. It reports the size, in bytes, of the
35 crash kernel area defined by the crashkernel= parameter.
36 This interface also allows reducing the crashkernel
37 reservation by writing a smaller value, and the reclaimed
38 space is added back to the system RAM.
39User: Kdump service
40
41What: /sys/kernel/kexec/crash_elfcorehdr_size
42Date: Nov 2025
43Contact: kexec@lists.infradead.org
44Description: read only
45 Indicates the preferred size of the memory buffer for the
46 ELF core header used by the crash (kdump) kernel. It defines
47 how much space is needed to hold metadata about the crashed
48 system, including CPU and memory information. This information
49 is used by the user space utility kexec to support updating the
50 in-kernel kdump image during hotplug operations.
51User: Kexec tools
52
53What: /sys/kernel/kexec/crash_cma_ranges
54Date: Nov 2025
55Contact: kexec@lists.infradead.org
56Description: read only
57 Provides information about the memory ranges reserved from
58 the Contiguous Memory Allocator (CMA) area that are allocated
59 to the crash (kdump) kernel. It lists the start and end physical
60 addresses of CMA regions assigned for crashkernel use.
61User: kdump service