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authorTony Luck <tony.luck@intel.com>2011-03-16 09:58:31 -0700
committerTony Luck <tony.luck@intel.com>2011-03-16 09:58:31 -0700
commitafe997a183ecc0be72652c7a5ce2152bdf91724e (patch)
tree307ec69f546700d1aac7a9bc23853f6e4ae875a0 /Documentation
parent4897313a62cf0b106e9e861bf7350a9cfc0715d0 (diff)
parent168f2e14319aba3125946649604e858cbae85be6 (diff)
downloadop-kernel-dev-afe997a183ecc0be72652c7a5ce2152bdf91724e.zip
op-kernel-dev-afe997a183ecc0be72652c7a5ce2152bdf91724e.tar.gz
Pull pstorev4 into release branch
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/pstore35
-rw-r--r--Documentation/ABI/testing/sysfs-fs-pstore7
2 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/pstore b/Documentation/ABI/testing/pstore
new file mode 100644
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+++ b/Documentation/ABI/testing/pstore
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+Where: /dev/pstore/...
+Date: January 2011
+Kernel Version: 2.6.38
+Contact: tony.luck@intel.com
+Description: Generic interface to platform dependent persistent storage.
+
+ Platforms that provide a mechanism to preserve some data
+ across system reboots can register with this driver to
+ provide a generic interface to show records captured in
+ the dying moments. In the case of a panic the last part
+ of the console log is captured, but other interesting
+ data can also be saved.
+
+ # mount -t pstore - /dev/pstore
+
+ $ ls -l /dev/pstore
+ total 0
+ -r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-erst-1
+
+ Different users of this interface will result in different
+ filename prefixes. Currently two are defined:
+
+ "dmesg" - saved console log
+ "mce" - architecture dependent data from fatal h/w error
+
+ Once the information in a file has been read, removing
+ the file will signal to the underlying persistent storage
+ device that it can reclaim the space for later re-use.
+
+ $ rm /dev/pstore/dmesg-erst-1
+
+ The expectation is that all files in /dev/pstore
+ will be saved elsewhere and erased from persistent store
+ soon after boot to free up space ready for the next
+ catastrophe.
diff --git a/Documentation/ABI/testing/sysfs-fs-pstore b/Documentation/ABI/testing/sysfs-fs-pstore
new file mode 100644
index 0000000..8e659d8
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-fs-pstore
@@ -0,0 +1,7 @@
+What: /sys/fs/pstore/kmsg_bytes
+Date: January 2011
+Kernel Version: 2.6.38
+Contact: "Tony Luck" <tony.luck@intel.com>
+Description:
+ Controls amount of console log that will be saved
+ to persistent store on oops/panic.
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