2010-12-29 06:25:21 +08:00
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config PSTORE
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2011-03-31 09:57:33 +08:00
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bool "Persistent store support"
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2010-12-29 06:25:21 +08:00
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default n
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2013-08-17 04:52:57 +08:00
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select ZLIB_DEFLATE
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select ZLIB_INFLATE
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2010-12-29 06:25:21 +08:00
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help
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This option enables generic access to platform level
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persistent storage via "pstore" filesystem that can
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be mounted as /dev/pstore. Only useful if you have
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a platform level driver that registers with pstore to
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provide the data, so you probably should just go say "Y"
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(or "M") to a platform specific persistent store driver
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(e.g. ACPI_APEI on X86) which will select this for you.
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If you don't have a platform persistent store driver,
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say N.
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2012-05-16 20:43:08 +08:00
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2012-05-26 21:20:19 +08:00
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config PSTORE_CONSOLE
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bool "Log kernel console messages"
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depends on PSTORE
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help
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When the option is enabled, pstore will log all kernel
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messages, even if no oops or panic happened.
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2015-01-17 08:01:10 +08:00
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config PSTORE_PMSG
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bool "Log user space messages"
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depends on PSTORE
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help
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When the option is enabled, pstore will export a character
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interface /dev/pmsg0 to log user space messages. On reboot
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data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
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If unsure, say N.
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2012-07-10 08:10:41 +08:00
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config PSTORE_FTRACE
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bool "Persistent function tracer"
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depends on PSTORE
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depends on FUNCTION_TRACER
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pstore/ftrace: Convert to its own enable/disable debugfs knob
With this patch we no longer reuse function tracer infrastructure, now
we register our own tracer back-end via a debugfs knob.
It's a bit more code, but that is the only downside. On the bright side we
have:
- Ability to make persistent_ram module removable (when needed, we can
move ftrace_ops struct into a module). Note that persistent_ram is still
not removable for other reasons, but with this patch it's just one
thing less to worry about;
- Pstore part is more isolated from the generic function tracer. We tried
it already by registering our own tracer in available_tracers, but that
way we're loosing ability to see the traces while we record them to
pstore. This solution is somewhere in the middle: we only register
"internal ftracer" back-end, but not the "front-end";
- When there is only pstore tracing enabled, the kernel will only write
to the pstore buffer, omitting function tracer buffer (which, of course,
still can be enabled via 'echo function > current_tracer').
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
2012-07-18 05:26:15 +08:00
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depends on DEBUG_FS
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2012-07-10 08:10:41 +08:00
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help
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With this option kernel traces function calls into a persistent
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ram buffer that can be decoded and dumped after reboot through
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pstore filesystem. It can be used to determine what function
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was last called before a reset or panic.
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If unsure, say N.
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2012-05-16 20:43:08 +08:00
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config PSTORE_RAM
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tristate "Log panic/oops to a RAM buffer"
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depends on PSTORE
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2012-05-17 15:15:08 +08:00
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depends on HAS_IOMEM
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depends on HAVE_MEMBLOCK
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select REED_SOLOMON
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select REED_SOLOMON_ENC8
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select REED_SOLOMON_DEC8
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2012-05-16 20:43:08 +08:00
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help
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This enables panic and oops messages to be logged to a circular
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buffer in RAM where it can be read back at some later point.
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Note that for historical reasons, the module will be named
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"ramoops.ko".
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For more information, see Documentation/ramoops.txt.
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