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ftrace: add trace_special()

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for ad-hoc tracing.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-05-12 21:20:47 +02:00 • committed by Thomas Gleixner
parent cb0f12aae8
commit f0a920d575
2 changed files with 59 additions and 0 deletions
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44
kernel/trace/trace.c
View file

@ -137,6 +137,7 @@ enum trace_type {
TRACE_FN, TRACE_FN,
TRACE_CTX, TRACE_CTX,
TRACE_SPECIAL,
__TRACE_LAST_TYPE __TRACE_LAST_TYPE
}; };
@ -700,6 +701,22 @@ ftrace(struct trace_array *tr, struct trace_array_cpu *data,
spin_unlock(&data->lock); spin_unlock(&data->lock);
} }
notrace void
trace_special(struct trace_array *tr, struct trace_array_cpu *data,
unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
struct trace_entry *entry;
spin_lock(&data->lock);
entry = tracing_get_trace_entry(tr, data);
tracing_generic_entry_update(entry, 0);
entry->type = TRACE_SPECIAL;
entry->special.arg1 = arg1;
entry->special.arg2 = arg2;
entry->special.arg3 = arg3;
spin_unlock(&data->lock);
}
notrace void notrace void
tracing_sched_switch_trace(struct trace_array *tr, tracing_sched_switch_trace(struct trace_array *tr,
struct trace_array_cpu *data, struct trace_array_cpu *data,
@ -1167,6 +1184,12 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
entry->ctx.next_prio, entry->ctx.next_prio,
comm); comm);
break; break;
case TRACE_SPECIAL:
trace_seq_printf(s, " %lx %lx %lx\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
break;
default: default:
trace_seq_printf(s, "Unknown type %d\n", entry->type); trace_seq_printf(s, "Unknown type %d\n", entry->type);
} }
@ -1234,6 +1257,14 @@ static notrace int print_trace_fmt(struct trace_iterator *iter)
if (!ret) if (!ret)
return 0; return 0;
break; break;
case TRACE_SPECIAL:
ret = trace_seq_printf(s, " %lx %lx %lx\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
if (!ret)
return 0;
break;
} }
return 1; return 1;
} }
@ -1271,6 +1302,14 @@ static notrace int print_raw_fmt(struct trace_iterator *iter)
if (!ret) if (!ret)
return 0; return 0;
break; break;
case TRACE_SPECIAL:
ret = trace_seq_printf(s, " %lx %lx %lx\n",
entry->special.arg1,
entry->special.arg2,
entry->special.arg3);
if (!ret)
return 0;
break;
} }
return 1; return 1;
} }
@ -1304,6 +1343,11 @@ static notrace int print_bin_fmt(struct trace_iterator *iter)
SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid);
SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio);
break; break;
case TRACE_SPECIAL:
SEQ_PUT_FIELD_RET(s, entry->special.arg1);
SEQ_PUT_FIELD_RET(s, entry->special.arg2);
SEQ_PUT_FIELD_RET(s, entry->special.arg3);
break;
} }
return 1; return 1;
} }

15
kernel/trace/trace.h
View file

@ -25,6 +25,15 @@ struct ctx_switch_entry {
unsigned char next_prio; unsigned char next_prio;
}; };
/*
* Special (free-form) trace entry:
*/
struct special_entry {
unsigned long arg1;
unsigned long arg2;
unsigned long arg3;
};
/* /*
* The trace entry - the most basic unit of tracing. This is what * The trace entry - the most basic unit of tracing. This is what
* is printed in the end as a single line in the trace output, such as: * is printed in the end as a single line in the trace output, such as:
@ -41,6 +50,7 @@ struct trace_entry {
union { union {
struct ftrace_entry fn; struct ftrace_entry fn;
struct ctx_switch_entry ctx; struct ctx_switch_entry ctx;
struct special_entry special;
}; };
}; };
@ -154,6 +164,11 @@ void tracing_sched_switch_trace(struct trace_array *tr,
struct task_struct *next, struct task_struct *next,
unsigned long flags); unsigned long flags);
void tracing_record_cmdline(struct task_struct *tsk); void tracing_record_cmdline(struct task_struct *tsk);
void trace_special(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long arg1,
unsigned long arg2,
unsigned long arg3);
void tracing_start_function_trace(void); void tracing_start_function_trace(void);
void tracing_stop_function_trace(void); void tracing_stop_function_trace(void);