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tools lib traceevent: Added support for __get_bitmask() macro

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Coming in v3.16, trace events will be able to save bitmasks in raw
format in the ring buffer and output it with the __get_bitmask() macro.

In order for userspace tools to parse this, it must be able to handle
the __get_bitmask() call and be able to convert the data that's in
the ring buffer into a nice bitmask format. The output is similar to
what the kernel uses to print bitmasks, with a comma separator every
4 bytes (8 characters).

This allows for cpumasks to also be saved efficiently.

The first user is the thermal:thermal_power_limit event which has the
following output:

 thermal_power_limit:  cpus=0000000f freq=1900000 cdev_state=0 power=5252

Link: http://lkml.kernel.org/r/20140506132238.22e136d1@gandalf.local.home

Suggested-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Javi Merino <javi.merino@arm.com>
Link: http://lkml.kernel.org/r/20140603032224.229186537@goodmis.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-06-02 23:20:16 -04:00 • committed by Jiri Olsa
parent 49440828ad
commit 473a778a2f
4 changed files with 122 additions and 0 deletions
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7
tools/lib/traceevent/event-parse.h
View file

@ -208,6 +208,11 @@ struct print_arg_string {
int offset;
};
struct print_arg_bitmask {
char *bitmask;
int offset;
};
struct print_arg_field {
char *name;
struct format_field *field;
@ -274,6 +279,7 @@ enum print_arg_type {
PRINT_DYNAMIC_ARRAY,
PRINT_OP,
PRINT_FUNC,
PRINT_BITMASK,
};
struct print_arg {
@ -288,6 +294,7 @@ struct print_arg {
struct print_arg_hex hex;
struct print_arg_func func;
struct print_arg_string string;
struct print_arg_bitmask bitmask;
struct print_arg_op op;
struct print_arg_dynarray dynarray;
};