What: /sys/devices/system/machinecheck/machinecheckX/
Contact: Andi Kleen <[email protected]>
Date: Feb, 2007
Description:
(X = CPU number)
Machine checks report internal hardware error conditions
detected by the CPU. Uncorrected errors typically cause a
machine check (often with panic), corrected ones cause a
machine check log entry.
For more details about the x86 machine check architecture
see the Intel and AMD architecture manuals from their
developer websites.
For more details about the architecture
see http://one.firstfloor.org/~andi/mce.pdf
Each CPU has its own directory.
What: /sys/devices/system/machinecheck/machinecheckX/bank<Y>
Contact: Andi Kleen <[email protected]>
Date: Feb, 2007
Description:
(Y bank number)
64bit Hex bitmask enabling/disabling specific subevents for
bank Y.
When a bit in the bitmask is zero then the respective
subevent will not be reported.
By default all events are enabled.
Note that BIOS maintain another mask to disable specific events
per bank. This is not visible here
What: /sys/devices/system/machinecheck/machinecheckX/check_interval
Contact: Andi Kleen <[email protected]>
Date: Feb, 2007
Description:
The entries appear for each CPU, but they are truly shared
between all CPUs.
How often to poll for corrected machine check errors, in
seconds (Note output is hexadecimal). Default 5 minutes.
When the poller finds MCEs it triggers an exponential speedup
(poll more often) on the polling interval. When the poller
stops finding MCEs, it triggers an exponential backoff
(poll less often) on the polling interval. The check_interval
variable is both the initial and maximum polling interval.
0 means no polling for corrected machine check errors
(but some corrected errors might be still reported
in other ways)
What: /sys/devices/system/machinecheck/machinecheckX/trigger
Contact: Andi Kleen <[email protected]>
Date: Feb, 2007
Description:
The entries appear for each CPU, but they are truly shared
between all CPUs.
Program to run when a machine check event is detected.
This is an alternative to running mcelog regularly from cron
and allows to detect events faster.
What: /sys/devices/system/machinecheck/machinecheckX/monarch_timeout
Contact: Andi Kleen <[email protected]>
Date: Feb, 2007
Description:
How long to wait for the other CPUs to machine check too on a
exception. 0 to disable waiting for other CPUs.
Unit: us
What: /sys/devices/system/machinecheck/machinecheckX/ignore_ce
Contact: Hidetoshi Seto <[email protected]>
Date: Jun 2009
Description:
Disables polling and CMCI for corrected errors.
All corrected events are not cleared and kept in bank MSRs.
What: /sys/devices/system/machinecheck/machinecheckX/dont_log_ce
Contact: Hidetoshi Seto <[email protected]>
Date: Jun 2009
Description:
Disables logging for corrected errors.
All reported corrected errors will be cleared silently.
This option will be useful if you never care about corrected
errors.
What: /sys/devices/system/machinecheck/machinecheckX/cmci_disabled
Contact: Hidetoshi Seto <[email protected]>
Date: Jun 2009
Description:
Disables the CMCI feature.
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