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| author |   Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-07-09 17:10:41 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-17 10:05:52 -0700 |
| commit | 060287b8c467bf49a594d8d669e1986c6d8d76b0 (patch) | |
| tree | f869d1cc6d09875a0dc4f42b230f144617fc3bfc /fs/pstore/Kconfig | |
| parent | pstore: Introduce write_buf backend callback (diff) | |
| download | linux-dev-060287b8c467bf49a594d8d669e1986c6d8d76b0.tar.xz linux-dev-060287b8c467bf49a594d8d669e1986c6d8d76b0.zip | |
pstore: Add persistent function tracing
With this support kernel can save function call chain log into a
persistent ram buffer that can be decoded and dumped after reboot
through pstore filesystem. It can be used to determine what function
was last called before a reset or panic.
We store the log in a binary format and then decode it at read time.
p.s.
Mostly the code comes from trace_persistent.c driver found in the
Android git tree, written by Colin Cross <ccross@android.com>
(according to sign-off history). I reworked the driver a little bit,
and ported it to pstore.
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/pstore/Kconfig')
| -rw-r--r-- | fs/pstore/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig index d044de6ee308..d39bb5cce883 100644 --- a/fs/pstore/Kconfig +++ b/fs/pstore/Kconfig @@ -19,6 +19,18 @@ config PSTORE_CONSOLE When the option is enabled, pstore will log all kernel messages, even if no oops or panic happened. +config PSTORE_FTRACE + bool "Persistent function tracer" + depends on PSTORE + depends on FUNCTION_TRACER + help + With this option kernel traces function calls into a persistent + ram buffer that can be decoded and dumped after reboot through + pstore filesystem. It can be used to determine what function + was last called before a reset or panic. + + If unsure, say N. + config PSTORE_RAM tristate "Log panic/oops to a RAM buffer" depends on PSTORE |