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60 lines
2.3 KiB
60 lines
2.3 KiB
Ramoops oops/panic logger |
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========================= |
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ramoops provides persistent RAM storage for oops and panics, so they can be |
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recovered after a reboot. This is a child-node of "/reserved-memory", and |
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is named "ramoops" after the backend, rather than "pstore" which is the |
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subsystem. |
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Parts of this storage may be set aside for other persistent log buffers, such |
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as kernel log messages, or for optional ECC error-correction data. The total |
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size of these optional buffers must fit in the reserved region. |
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Any remaining space will be used for a circular buffer of oops and panic |
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records. These records have a configurable size, with a size of 0 indicating |
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that they should be disabled. |
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At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size" |
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must be set non-zero, but are otherwise optional as listed below. |
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Required properties: |
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- compatible: must be "ramoops" |
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- reg: region of memory that is preserved between reboots |
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Optional properties: |
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- ecc-size: enables ECC support and specifies ECC buffer size in bytes |
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(defaults to 0: no ECC) |
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- record-size: maximum size in bytes of each kmsg dump. |
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(defaults to 0: disabled) |
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- console-size: size in bytes of log buffer reserved for kernel messages |
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(defaults to 0: disabled) |
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- ftrace-size: size in bytes of log buffer reserved for function tracing and |
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profiling (defaults to 0: disabled) |
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- pmsg-size: size in bytes of log buffer reserved for userspace messages |
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(defaults to 0: disabled) |
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- unbuffered: if present, use unbuffered mappings to map the reserved region |
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(defaults to buffered mappings) |
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- max-reason: if present, sets maximum type of kmsg dump reasons to store |
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(defaults to 2: log Oopses and Panics). This can be set to INT_MAX to |
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store all kmsg dumps. See include/linux/kmsg_dump.h KMSG_DUMP_* for other |
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kmsg dump reason values. Setting this to 0 (KMSG_DUMP_UNDEF), means the |
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reason filtering will be controlled by the printk.always_kmsg_dump boot |
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param: if unset, it will be KMSG_DUMP_OOPS, otherwise KMSG_DUMP_MAX. |
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- no-dump-oops: deprecated, use max_reason instead. If present, and |
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max_reason is not specified, it is equivalent to max_reason = 1 |
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(KMSG_DUMP_PANIC). |
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- flags: if present, pass ramoops behavioral flags (defaults to 0, |
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see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values).
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