tep_data_type3

Usage

Overview

This set of functions can be used to extract common fields from a record.

The tep_data_type() function gets the event id from the record rec. It reads the "common_type" field. The tep argument is the trace event parser context.

The tep_data_pid() function gets the process id from the record rec. It reads the "common_pid" field. The tep argument is the trace event parser context.

The tep_data_preempt_count() function gets the preemption count from the record rec. It reads the "common_preempt_count" field. The tep argument is the trace event parser context.

The tep_data_flags() function gets the latency flags from the record rec. It reads the "common_flags" field. The tep argument is the trace event parser context. Supported latency flags are:

        TRACE_FLAG_IRQS_OFF,          Interrupts are disabled.
        TRACE_FLAG_IRQS_NOSUPPORT,    Reading IRQ flag is not supported by the architecture.
        TRACE_FLAG_NEED_RESCHED,      Task needs rescheduling.
        TRACE_FLAG_HARDIRQ,           Hard IRQ is running.
        TRACE_FLAG_SOFTIRQ,           Soft IRQ is running.

Return value

The tep_data_type() function returns an integer, representing the event id.

The tep_data_pid() function returns an integer, representing the process id

The tep_data_preempt_count() function returns an integer, representing the preemption count.

The tep_data_flags() function returns an integer, representing the latency flags. Look at the trace_flag_type enum for supported flags.

All these functions in case of an error return a negative integer.

Examples

#include <event-parse.h>
...
struct tep_handle *tep = tep_alloc();
...
void process_record(struct tep_record *record)
{
        int data;
        data = tep_data_type(tep, record);
        if (data >= 0) {
                /* Got the ID of the event */
        }
        data = tep_data_pid(tep, record);
        if (data >= 0) {
                /* Got the process ID */
        }
        data = tep_data_preempt_count(tep, record);
        if (data >= 0) {
                /* Got the preemption count */
        }
        data = tep_data_flags(tep, record);
        if (data >= 0) {
                /* Got the latency flags */
        }
}
...

Files

event-parse.h
        Header file to include in order to have access to the library APIs.
-ltraceevent
        Linker switch to add when building a program that uses the library.

Resources

https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/

Notes

1.

[email protected]

mailto:[email protected]

2.

[email protected]

mailto:[email protected]

3.

[email protected]

mailto:[email protected]