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1Where: /dev/pstore/...
2Date: January 2011
3Kernel Version: 2.6.38
4Contact: tony.luck@intel.com
5Description: Generic interface to platform dependent persistent storage.
6
7 Platforms that provide a mechanism to preserve some data
8 across system reboots can register with this driver to
9 provide a generic interface to show records captured in
10 the dying moments. In the case of a panic the last part
11 of the console log is captured, but other interesting
12 data can also be saved.
13
14 # mount -t pstore - /dev/pstore
15
16 $ ls -l /dev/pstore
17 total 0
18 -r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-erst-1
19
20 Different users of this interface will result in different
21 filename prefixes. Currently two are defined:
22
23 "dmesg" - saved console log
24 "mce" - architecture dependent data from fatal h/w error
25
26 Once the information in a file has been read, removing
27 the file will signal to the underlying persistent storage
28 device that it can reclaim the space for later re-use.
29
30 $ rm /dev/pstore/dmesg-erst-1
31
32 The expectation is that all files in /dev/pstore
33 will be saved elsewhere and erased from persistent store
34 soon after boot to free up space ready for the next
35 catastrophe.