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author | Li Zefan <lizf@cn.fujitsu.com> | 2009-08-17 16:56:28 +0800 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-08-17 11:25:08 +0200 |
commit | 7ead8b8313d92b3a69a1a61b0dcbc4cd66c960dc (patch) | |
tree | 614759ec1b24ea9f6d1409b866c80df0611e5d6b /include/linux/module.h | |
parent | 60d970c254b95ec7a0fc4c590b510253987b64a0 (diff) | |
download | linux-3.10-7ead8b8313d92b3a69a1a61b0dcbc4cd66c960dc.tar.gz linux-3.10-7ead8b8313d92b3a69a1a61b0dcbc4cd66c960dc.tar.bz2 linux-3.10-7ead8b8313d92b3a69a1a61b0dcbc4cd66c960dc.zip |
tracing/events: Add module tracepoints
Add trace points to trace module_load, module_free, module_get,
module_put and module_request, and use trace_event facility to
get the trace output.
Here's the sample output:
TASK-PID CPU# TIMESTAMP FUNCTION
| | | | |
<...>-42 [000] 1.758380: module_request: fb0 wait=1 call_site=fb_open
...
<...>-60 [000] 3.269403: module_load: scsi_wait_scan
<...>-60 [000] 3.269432: module_put: scsi_wait_scan call_site=sys_init_module refcnt=0
<...>-61 [001] 3.273168: module_free: scsi_wait_scan
...
<...>-1021 [000] 13.836081: module_load: sunrpc
<...>-1021 [000] 13.840589: module_put: sunrpc call_site=sys_init_module refcnt=-1
<...>-1027 [000] 13.848098: module_get: sunrpc call_site=try_module_get refcnt=0
<...>-1027 [000] 13.848308: module_get: sunrpc call_site=get_filesystem refcnt=1
<...>-1027 [000] 13.848692: module_put: sunrpc call_site=put_filesystem refcnt=0
...
modprobe-2587 [001] 1088.437213: module_load: trace_events_sample F
modprobe-2587 [001] 1088.437786: module_put: trace_events_sample call_site=sys_init_module refcnt=0
Note:
- the taints flag can be 'F', 'C' and/or 'P' if mod->taints != 0
- the module refcnt is percpu, so it can be negative in a
specific cpu
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <4A891B3C.5030608@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/module.h')
-rw-r--r-- | include/linux/module.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/include/linux/module.h b/include/linux/module.h index 098bdb7bfac..f8f92d015ef 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -17,10 +17,12 @@ #include <linux/moduleparam.h> #include <linux/marker.h> #include <linux/tracepoint.h> -#include <asm/local.h> +#include <asm/local.h> #include <asm/module.h> +#include <trace/events/module.h> + /* Not Yet Implemented */ #define MODULE_SUPPORTED_DEVICE(name) @@ -462,7 +464,10 @@ static inline local_t *__module_ref_addr(struct module *mod, int cpu) static inline void __module_get(struct module *module) { if (module) { - local_inc(__module_ref_addr(module, get_cpu())); + unsigned int cpu = get_cpu(); + local_inc(__module_ref_addr(module, cpu)); + trace_module_get(module, _THIS_IP_, + local_read(__module_ref_addr(module, cpu))); put_cpu(); } } @@ -473,8 +478,11 @@ static inline int try_module_get(struct module *module) if (module) { unsigned int cpu = get_cpu(); - if (likely(module_is_live(module))) + if (likely(module_is_live(module))) { local_inc(__module_ref_addr(module, cpu)); + trace_module_get(module, _THIS_IP_, + local_read(__module_ref_addr(module, cpu))); + } else ret = 0; put_cpu(); |