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x86, mce: improve documentation 

Document that check_interval set to 0 means no polling.
Noticed by Hidetoshi Seto

Also add a reference from boot options to the sysfs tunables

Acked-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Andi Kleen 2009-05-27 21:56:56 +02:00 committed by H. Peter Anvin
parent b170204ddb
commit 8780e8e0f6
2 changed files with 5 additions and 1 deletions
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2
Documentation/x86/x86_64/boot-options.txt
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@ -5,6 +5,8 @@ only the AMD64 specific ones are listed here.
Machine check Machine check
Please see Documentation/x86/x86_64/machinecheck for sysfs runtime tunables.
mce=off disable machine check mce=off disable machine check
mce=bootlog Enable logging of machine checks left over from booting. mce=bootlog Enable logging of machine checks left over from booting.
Disabled by default on AMD because some BIOS leave bogus ones. Disabled by default on AMD because some BIOS leave bogus ones.

4
Documentation/x86/x86_64/machinecheck
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@ -41,7 +41,9 @@ check_interval
the polling interval. When the poller stops finding MCEs, it the polling interval. When the poller stops finding MCEs, it
triggers an exponential backoff (poll less often) on the polling triggers an exponential backoff (poll less often) on the polling
interval. The check_interval variable is both the initial and interval. The check_interval variable is both the initial and
maximum polling interval. maximum polling interval. 0 means no polling for corrected machine
check errors (but some corrected errors might be still reported
in other ways)
tolerant tolerant
Tolerance level. When a machine check exception occurs for a non Tolerance level. When a machine check exception occurs for a non