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markers: auto enable tracepoints (new API : trace_mark_tp())

Browse source 
Impact: new API

Add a new API trace_mark_tp(), which declares a marker within a
tracepoint probe. When the marker is activated, the tracepoint is
automatically enabled.

No branch test is used at the marker site, because it would be a
duplicate of the branch already present in the tracepoint.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mathieu Desnoyers 2008-11-14 17:47:39 -05:00 • committed by Ingo Molnar
parent a419246ac7
commit c1df1bd2c4
3 changed files with 96 additions and 3 deletions
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53
kernel/marker.c
View file

@ -479,7 +479,7 @@ static int marker_set_format(struct marker_entry *entry, const char *format)
static int set_marker(struct marker_entry *entry, struct marker *elem,
int active)
{
int ret;
int ret = 0;
WARN_ON(strcmp(entry->name, elem->name) != 0);
if (entry->format) {
@ -531,9 +531,40 @@ static int set_marker(struct marker_entry *entry, struct marker *elem,
*/
smp_wmb();
elem->ptype = entry->ptype;
if (elem->tp_name && (active ^ elem->state)) {
WARN_ON(!elem->tp_cb);
/*
* It is ok to directly call the probe registration because type
* checking has been done in the __trace_mark_tp() macro.
*/
if (active) {
/*
* try_module_get should always succeed because we hold
* lock_module() to get the tp_cb address.
*/
ret = try_module_get(__module_text_address(
(unsigned long)elem->tp_cb));
BUG_ON(!ret);
ret = tracepoint_probe_register_noupdate(
elem->tp_name,
elem->tp_cb);
} else {
ret = tracepoint_probe_unregister_noupdate(
elem->tp_name,
elem->tp_cb);
/*
* tracepoint_probe_update_all() must be called
* before the module containing tp_cb is unloaded.
*/
module_put(__module_text_address(
(unsigned long)elem->tp_cb));
}
}
elem->state = active;
return 0;
return ret;
}
/*
@ -544,7 +575,24 @@ static int set_marker(struct marker_entry *entry, struct marker *elem,
*/
static void disable_marker(struct marker *elem)
{
int ret;
/* leave "call" as is. It is known statically. */
if (elem->tp_name && elem->state) {
WARN_ON(!elem->tp_cb);
/*
* It is ok to directly call the probe registration because type
* checking has been done in the __trace_mark_tp() macro.
*/
ret = tracepoint_probe_unregister_noupdate(elem->tp_name,
elem->tp_cb);
WARN_ON(ret);
/*
* tracepoint_probe_update_all() must be called
* before the module containing tp_cb is unloaded.
*/
module_put(__module_text_address((unsigned long)elem->tp_cb));
}
elem->state = 0;
elem->single.func = __mark_empty_function;
/* Update the function before setting the ptype */
@ -608,6 +656,7 @@ static void marker_update_probes(void)
marker_update_probe_range(__start___markers, __stop___markers);
/* Markers in modules. */
module_update_markers();
tracepoint_probe_update_all();
}
/**