pstore: use mount option instead sysfs to tweak kmsg_bytes
/sys/fs is a somewhat strange way to tweak what could more
obviously be tuned with a mount option.
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/ABI/testing/pstore b/Documentation/ABI/testing/pstore
index f1fb2a0..ddf451e 100644
--- a/Documentation/ABI/testing/pstore
+++ b/Documentation/ABI/testing/pstore
@@ -1,6 +1,6 @@
Where: /dev/pstore/...
-Date: January 2011
-Kernel Version: 2.6.38
+Date: March 2011
+Kernel Version: 2.6.39
Contact: tony.luck@intel.com
Description: Generic interface to platform dependent persistent storage.
@@ -11,7 +11,7 @@
of the console log is captured, but other interesting
data can also be saved.
- # mount -t pstore - /dev/pstore
+ # mount -t pstore -o kmsg_bytes=8000 - /dev/pstore
$ ls -l /dev/pstore
total 0
@@ -33,3 +33,9 @@
will be saved elsewhere and erased from persistent store
soon after boot to free up space ready for the next
catastrophe.
+
+ The 'kmsg_bytes' mount option changes the target amount of
+ data saved on each oops/panic. Pstore saves (possibly
+ multiple) files based on the record size of the underlying
+ persistent storage until at least this amount is reached.
+ Default is 10 Kbytes.