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author | Li Zefan <lizf@cn.fujitsu.com> | 2009-08-17 08:56:28 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-08-17 09:25:08 (GMT) |
commit | 7ead8b8313d92b3a69a1a61b0dcbc4cd66c960dc (patch) | |
tree | 614759ec1b24ea9f6d1409b866c80df0611e5d6b /include | |
parent | 60d970c254b95ec7a0fc4c590b510253987b64a0 (diff) | |
download | linux-fsl-qoriq-7ead8b8313d92b3a69a1a61b0dcbc4cd66c960dc.tar.xz |
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')
-rw-r--r-- | include/linux/module.h | 14 | ||||
-rw-r--r-- | include/trace/events/module.h | 126 |
2 files changed, 137 insertions, 3 deletions
diff --git a/include/linux/module.h b/include/linux/module.h index 098bdb7..f8f92d0 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(); diff --git a/include/trace/events/module.h b/include/trace/events/module.h new file mode 100644 index 0000000..84160fb --- /dev/null +++ b/include/trace/events/module.h @@ -0,0 +1,126 @@ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM module + +#if !defined(_TRACE_MODULE_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_MODULE_H + +#include <linux/tracepoint.h> + +#ifdef CONFIG_MODULES + +struct module; + +#define show_module_flags(flags) __print_flags(flags, "", \ + { (1UL << TAINT_PROPRIETARY_MODULE), "P" }, \ + { (1UL << TAINT_FORCED_MODULE), "F" }, \ + { (1UL << TAINT_CRAP), "C" }) + +TRACE_EVENT(module_load, + + TP_PROTO(struct module *mod), + + TP_ARGS(mod), + + TP_STRUCT__entry( + __field( unsigned int, taints ) + __string( name, mod->name ) + ), + + TP_fast_assign( + __entry->taints = mod->taints; + __assign_str(name, mod->name); + ), + + TP_printk("%s %s", __get_str(name), show_module_flags(__entry->taints)) +); + +TRACE_EVENT(module_free, + + TP_PROTO(struct module *mod), + + TP_ARGS(mod), + + TP_STRUCT__entry( + __string( name, mod->name ) + ), + + TP_fast_assign( + __assign_str(name, mod->name); + ), + + TP_printk("%s", __get_str(name)) +); + +TRACE_EVENT(module_get, + + TP_PROTO(struct module *mod, unsigned long ip, int refcnt), + + TP_ARGS(mod, ip, refcnt), + + TP_STRUCT__entry( + __field( unsigned long, ip ) + __field( int, refcnt ) + __string( name, mod->name ) + ), + + TP_fast_assign( + __entry->ip = ip; + __entry->refcnt = refcnt; + __assign_str(name, mod->name); + ), + + TP_printk("%s call_site=%pf refcnt=%d", + __get_str(name), (void *)__entry->ip, __entry->refcnt) +); + +TRACE_EVENT(module_put, + + TP_PROTO(struct module *mod, unsigned long ip, int refcnt), + + TP_ARGS(mod, ip, refcnt), + + TP_STRUCT__entry( + __field( unsigned long, ip ) + __field( int, refcnt ) + __string( name, mod->name ) + ), + + TP_fast_assign( + __entry->ip = ip; + __entry->refcnt = refcnt; + __assign_str(name, mod->name); + ), + + TP_printk("%s call_site=%pf refcnt=%d", + __get_str(name), (void *)__entry->ip, __entry->refcnt) +); + +TRACE_EVENT(module_request, + + TP_PROTO(char *name, bool wait, unsigned long ip), + + TP_ARGS(name, wait, ip), + + TP_STRUCT__entry( + __field( bool, wait ) + __field( unsigned long, ip ) + __string( name, name ) + ), + + TP_fast_assign( + __entry->wait = wait; + __entry->ip = ip; + __assign_str(name, name); + ), + + TP_printk("%s wait=%d call_site=%pf", + __get_str(name), (int)__entry->wait, (void *)__entry->ip) +); + +#endif /* CONFIG_MODULES */ + +#endif /* _TRACE_MODULE_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> + |