renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-18 10:13:57 +08:00
Code

tools lib traceevent: Allow setting an alternative symbol resolver

Browse Source 
The perf tools have a symbol resolver that includes solving kernel
symbols using either kallsyms or ELF symtabs, and it also is using
libtraceevent to format the trace events fields, including via
subsystem specific plugins, like the "timer" one.

To solve fields like "timer:hrtimer_start"'s "function", libtraceevent
needs a way to map from its value to a function name and addr.

This patch provides a way for tools that already have symbol resolving
facilities to ask libtraceevent to use it when needing to resolve
kernel symbols.

Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-fdx1fazols17w5py26ia3bwh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-07-22 12:36:55 -03:00
parent e6ce712634
commit 33a2471cc9
2 changed files with 75 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
tools/lib/traceevent/event-parse.c
View File

@ -418,7 +418,7 @@ static int func_map_init(struct pevent *pevent)
}
static struct func_map *
find_func(struct pevent *pevent, unsigned long long addr)
__find_func(struct pevent *pevent, unsigned long long addr)
{
struct func_map *func;
struct func_map key;
@ -434,6 +434,71 @@ find_func(struct pevent *pevent, unsigned long long addr)
return func;
}
struct func_resolver {
pevent_func_resolver_t *func;
void *priv;
struct func_map map;
};
/**
* pevent_set_function_resolver - set an alternative function resolver
* @pevent: handle for the pevent
* @resolver: function to be used
* @priv: resolver function private state.
*
* Some tools may have already a way to resolve kernel functions, allow them to
* keep using it instead of duplicating all the entries inside
* pevent->funclist.
*/
int pevent_set_function_resolver(struct pevent *pevent,
pevent_func_resolver_t *func, void *priv)
{
struct func_resolver *resolver = malloc(sizeof(*resolver));
if (resolver == NULL)
return -1;
resolver->func = func;
resolver->priv = priv;
free(pevent->func_resolver);
pevent->func_resolver = resolver;
return 0;
}
/**
* pevent_reset_function_resolver - reset alternative function resolver
* @pevent: handle for the pevent
*
* Stop using whatever alternative resolver was set, use the default
* one instead.
*/
void pevent_reset_function_resolver(struct pevent *pevent)
{
free(pevent->func_resolver);
pevent->func_resolver = NULL;
}
static struct func_map *
find_func(struct pevent *pevent, unsigned long long addr)
{
struct func_map *map;
if (!pevent->func_resolver)
return __find_func(pevent, addr);
map = &pevent->func_resolver->map;
map->mod = NULL;
map->addr = addr;
map->func = pevent->func_resolver->func(pevent->func_resolver->priv,
&map->addr, &map->mod);
if (map->func == NULL)
return NULL;
return map;
}
/**
* pevent_find_function - find a function by a given address
* @pevent: handle for the pevent
@ -6564,6 +6629,7 @@ void pevent_free(struct pevent *pevent)
free(pevent->trace_clock);
free(pevent->events);
free(pevent->sort_events);
free(pevent->func_resolver);
free(pevent);
}

8
tools/lib/traceevent/event-parse.h
View File

@ -453,6 +453,10 @@ struct cmdline_list;
struct func_map;
struct func_list;
struct event_handler;
struct func_resolver;
typedef char *(pevent_func_resolver_t)(void *priv,
unsigned long long *addrp, char **modp);
struct pevent {
int ref_count;
@ -481,6 +485,7 @@ struct pevent {
int cmdline_count;
struct func_map *func_map;
struct func_resolver *func_resolver;
struct func_list *funclist;
unsigned int func_count;
@ -611,6 +616,9 @@ enum trace_flag_type {
TRACE_FLAG_SOFTIRQ = 0x10,
};
int pevent_set_function_resolver(struct pevent *pevent,
pevent_func_resolver_t *func, void *priv);
void pevent_reset_function_resolver(struct pevent *pevent);
int pevent_register_comm(struct pevent *pevent, const char *comm, int pid);
int pevent_register_trace_clock(struct pevent *pevent, const char *trace_clock);
int pevent_register_function(struct pevent *pevent, char *name,