| commit | 7975a2be16dd42df2cab80c80cb6ece382edb6ec | |
| author | Steven Rostedt <srostedt@redhat.com> | |
| Thu, 12 Mar 2009 18:23:17 +0000 (12 14:23 -0400) | ||
| committer | Steven Rostedt <srostedt@redhat.com> | |
| Fri, 13 Mar 2009 01:15:01 +0000 (12 21:15 -0400) | ||
| tree | b9fdae6b0f3cd7c902beb8bf995efe2d827e02a2 | treesnapshot (tar.gz zip) |
| parent | e9fb2b6d5845e24f104713591286b6f39761c027 | commitdiff |
tracing: export trace formats to user space
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>
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>
| kernel/trace/trace_printk.c | diffblobblamehistory |