7ead8b8313
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>
126 lines
2.3 KiB
C
126 lines
2.3 KiB
C
#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>
|
|
|