lkml.org 
[lkml]   [2021]   [Dec]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V8 02/14] rtla: Helper functions for rtla
On Mon, Nov 29, 2021 at 12:07:40PM +0100,
Daniel Bristot de Oliveira wrote:

> +/*
> + * enable_tracer_by_name - enable a tracer on the given instance
> + */
> +int enable_tracer_by_name(struct tracefs_instance *inst, const char *tracer)
> +{
> + enum tracefs_tracers t;
> + int retval;
> +
> + t = TRACEFS_TRACER_CUSTOM;
> +
> + debug_msg("enabling %s tracer\n", tracer);
> +
> + retval = tracefs_tracer_set(inst, t, tracer);

The comment of parameters used for tracefs_tracer_set() says:

'
* tracefs_set_tracer - function to set the tracer
* @instance: ftrace instance, can be NULL for top tracing instance
* @tracer: The tracer enum that defines the tracer to be set
* @t: A tracer name if TRACEFS_TRACER_CUSTOM is passed in for @tracer
'

tracefs_tracer_set(inst, tracer, t); @tracer is enum and @t is tracer
name. this is not important.

> + if (retval < 0) {
> + if (errno == ENODEV)
> + err_msg("tracer %s not found!\n", tracer);
> +
> + err_msg("failed to enable the tracer %s\n", tracer);
> + return -1;
> + }
> +
> + return 0;
> +}

\
 
 \ /
  Last update: 2021-12-03 10:08    [W:0.141 / U:2.196 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site