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perf evsel: Allow unresolved symbol names to be printed as addresses 

The fprintf_sym() and fprintf_callchain() methods now allow users to
change the existing behaviour of showing "[unknown]" as the name of
unresolved symbols to instead show "[0x123456]", i.e. its address.

The current patch doesn't change tools to use this facility, the results
from 'perf trace' and 'perf script' cotinue like:

70.109 ( 0.001 ms): qemu-system-x8/10153 poll(ufds: 0x7f2d93ffe870, nfds: 1) = 0 Timeout
                                   [unknown] (/usr/lib64/libc-2.22.so)
                                   [unknown] (/usr/lib64/libspice-server.so.1.10.0)
                                   [unknown] (/usr/lib64/libspice-server.so.1.10.0)
                                   [unknown] (/usr/lib64/libspice-server.so.1.10.0)
                                   start_thread+0xca (/usr/lib64/libpthread-2.22.so)
                                   __clone+0x6d (/usr/lib64/libc-2.22.so)

The next patch will make 'perf trace' use the new formatting.

Suggested-by: Milian Wolff <milian.wolff@kdab.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-fja1ods5vqpg42mdz09xcz3r@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-04-11 22:03:56 -03:00
parent fde54b7860
commit fd4be13067
4 changed files with 46 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
tools/perf/util/session.c
View File

@ -1966,6 +1966,7 @@ int perf_evsel__fprintf_callchain(struct perf_evsel *evsel, struct perf_sample *
int print_symoffset = print_opts & PRINT_IP_OPT_SYMOFFSET;
int print_oneline = print_opts & PRINT_IP_OPT_ONELINE;
int print_srcline = print_opts & PRINT_IP_OPT_SRCLINE;
int print_unknown_as_addr = print_opts & PRINT_IP_OPT_UNKNOWN_AS_ADDR;
char s = print_oneline ? ' ' : '\t';
if (sample->callchain) {
@ -2003,12 +2004,16 @@ int perf_evsel__fprintf_callchain(struct perf_evsel *evsel, struct perf_sample *
if (print_sym) {
printed += fprintf(fp, " ");
node_al.addr = addr;
node_al.map = node->map;
if (print_symoffset) {
node_al.addr = addr;
node_al.map = node->map;
printed += symbol__fprintf_symname_offs(node->sym, &node_al, fp);
} else
printed += symbol__fprintf_symname(node->sym, fp);
printed += __symbol__fprintf_symname_offs(node->sym, &node_al,
print_unknown_as_addr, fp);
} else {
printed += __symbol__fprintf_symname(node->sym, &node_al,
print_unknown_as_addr, fp);
}
}
if (print_dso) {
@ -2043,6 +2048,7 @@ int perf_evsel__fprintf_sym(struct perf_evsel *evsel, struct perf_sample *sample
int print_dso = print_opts & PRINT_IP_OPT_DSO;
int print_symoffset = print_opts & PRINT_IP_OPT_SYMOFFSET;
int print_srcline = print_opts & PRINT_IP_OPT_SRCLINE;
int print_unknown_as_addr = print_opts & PRINT_IP_OPT_UNKNOWN_AS_ADDR;
if (symbol_conf.use_callchain && sample->callchain) {
printed += perf_evsel__fprintf_callchain(evsel, sample, al, left_alignment,
@ -2055,10 +2061,13 @@ int perf_evsel__fprintf_sym(struct perf_evsel *evsel, struct perf_sample *sample
if (print_sym) {
printed += fprintf(fp, " ");
if (print_symoffset)
printed += symbol__fprintf_symname_offs(al->sym, al, fp);
else
printed += symbol__fprintf_symname(al->sym, fp);
if (print_symoffset) {
printed += __symbol__fprintf_symname_offs(al->sym, al,
print_unknown_as_addr, fp);
} else {
printed += __symbol__fprintf_symname(al->sym, al,
print_unknown_as_addr, fp);
}
}
if (print_dso) {

1
tools/perf/util/session.h
View File

@ -42,6 +42,7 @@ struct perf_session {
#define PRINT_IP_OPT_SYMOFFSET (1<<3)
#define PRINT_IP_OPT_ONELINE (1<<4)
#define PRINT_IP_OPT_SRCLINE (1<<5)
#define PRINT_IP_OPT_UNKNOWN_AS_ADDR (1<<6)
struct perf_tool;

25
tools/perf/util/symbol.c
View File

@ -264,8 +264,9 @@ size_t symbol__fprintf(struct symbol *sym, FILE *fp)
sym->name);
}
size_t symbol__fprintf_symname_offs(const struct symbol *sym,
const struct addr_location *al, FILE *fp)
size_t __symbol__fprintf_symname_offs(const struct symbol *sym,
const struct addr_location *al,
bool unknown_as_addr, FILE *fp)
{
unsigned long offset;
size_t length;
@ -280,13 +281,29 @@ size_t symbol__fprintf_symname_offs(const struct symbol *sym,
length += fprintf(fp, "+0x%lx", offset);
}
return length;
} else
} else if (al && unknown_as_addr)
return fprintf(fp, "[%#" PRIx64 "]", al->addr);
else
return fprintf(fp, "[unknown]");
}
size_t symbol__fprintf_symname_offs(const struct symbol *sym,
const struct addr_location *al,
FILE *fp)
{
return __symbol__fprintf_symname_offs(sym, al, false, fp);
}
size_t __symbol__fprintf_symname(const struct symbol *sym,
const struct addr_location *al,
bool unknown_as_addr, FILE *fp)
{
return __symbol__fprintf_symname_offs(sym, al, unknown_as_addr, fp);
}
size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
{
return symbol__fprintf_symname_offs(sym, NULL, fp);
return __symbol__fprintf_symname_offs(sym, NULL, false, fp);
}
void symbols__delete(struct rb_root *symbols)

6
tools/perf/util/symbol.h
View File

@ -262,8 +262,14 @@ int symbol__init(struct perf_env *env);
void symbol__exit(void);
void symbol__elf_init(void);
struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name);
size_t __symbol__fprintf_symname_offs(const struct symbol *sym,
const struct addr_location *al,
bool unknown_as_addr, FILE *fp);
size_t symbol__fprintf_symname_offs(const struct symbol *sym,
const struct addr_location *al, FILE *fp);
size_t __symbol__fprintf_symname(const struct symbol *sym,
const struct addr_location *al,
bool unknown_as_addr, FILE *fp);
size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp);
size_t symbol__fprintf(struct symbol *sym, FILE *fp);
bool symbol_type__is_a(char symbol_type, enum map_type map_type);