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tracing/ftrace: change the type of the print_line callback

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We need a kind of disambiguation when a print_line callback
returns 0.

_There is not enough space to print all the entry.
 Please flush the seq and retry.
_I can't handle this type of entry

This patch changes the type of this callback for better information.

Also some changes have been made in this V2.

_ Only relay to default functions after the print_line callback fails.
_ This patch doesn't fix the issue with the broken pipe (see patch 2/4 for that)

Some things are still in discussion:

_ Find better names for the enum print_line_t values
_ Change the type of print_trace_line into boolean.

Patches to change that can be sent later.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Pekka Paalanen <pq@iki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker
2008-09-29 20:18:34 +02:00
committed by Ingo Molnar
parent 777e208d40
commit 2c4f035f6c
2 changed files with 50 additions and 37 deletions
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10
kernel/trace/trace.h
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@@ -177,6 +177,14 @@ struct trace_array {
struct trace_array_cpu *data[NR_CPUS];
};
/* Return values for print_line callback */
enum print_line_t {
TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
TRACE_TYPE_HANDLED = 1,
TRACE_TYPE_UNHANDLED = 2 /* Relay to other output functions */
};
/*
* A specific tracer, represented by methods that operate on a trace array:
*/
@@ -197,7 +205,7 @@ struct tracer {
int (*selftest)(struct tracer *trace,
struct trace_array *tr);
#endif
int (*print_line)(struct trace_iterator *iter);
enum print_line_t (*print_line)(struct trace_iterator *iter);
struct tracer *next;
int print_max;
};