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tracepoint: introduce *_noupdate APIs.

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Impact: add new tracepoint APIs to allow the batched registration of probes

new APIs separate tracepoint_probe_register(),
tracepoint_probe_unregister() into 2 steps. The first step of them
is just update tracepoint_entry, not connect or disconnect.

this patch introduces tracepoint_probe_update_all() for update all.

these APIs are very useful for registering lots of probes
but just updating once. Another very important thing is that
*_noupdate APIs do not require module_mutex.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Lai Jiangshan
2008-10-28 10:51:53 +08:00
committed by Ingo Molnar
parent 19dba33c43
commit 127cafbb27
2 changed files with 136 additions and 38 deletions
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4
include/linux/tracepoint.h
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@@ -112,6 +112,10 @@ extern int tracepoint_probe_register(const char *name, void *probe);
*/
extern int tracepoint_probe_unregister(const char *name, void *probe);
extern int tracepoint_probe_register_noupdate(const char *name, void *probe);
extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe);
extern void tracepoint_probe_update_all(void);
struct tracepoint_iter {
struct module *module;
struct tracepoint *tracepoint;