tracing: export trace formats to user space

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The binary printk saves a pointer to the format string in the ring buffer.
On output, the format is processed. But if the user is reading the
ring buffer through a binary interface, the pointer is meaningless.

This patch creates a file called printk_formats that maps the pointers
to the formats.

 # cat /debug/tracing/printk_formats
0xffffffff80713d40 : "irq_handler_entry: irq=%d handler=%s\n"
0xffffffff80713d48 : "lock_acquire: %s%s%s\n"
0xffffffff80713d50 : "lock_release: %s\n"

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

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This commit is contained in:

Steven Rostedt 2009-03-12 14:23:17 -04:00

parent e9fb2b6d58

commit 7975a2be16

1 changed files with 114 additions and 5 deletions

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kernel/trace/trace_printk.c

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