renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-16 17:23:55 +08:00
Code

perf script: Support filtering by hex address

Browse Source 
'perf script' supports '-S' or '--symbol' options to only list the
records for these symbols. A symbol is typically a name or hex address.
If it's hex address, it is the start address of one symbol.

While it would be useful if we can filter trace records by any hex
address (not only the start address of symbol). So now we support
filtering trace records by more conditions, such as:

- symbol name
- start address of symbol
- any hexadecimal address
- address range

The comparison order is defined as:

1. symbol name comparison
2. symbol start address comparison.
3. any hexadecimal address comparison.
4. address range comparison.

The idea is if we can get a valid address from -S list, we add the
address to addr_list for address comparison otherwise we still leave
it to sym_list for symbol comparison.

Some examples:

  root@kbl-ppc:~# ./perf script -S ffffffff9a477308
            perf  8562 [000] 347303.578858:          1   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])
            perf  8562 [000] 347303.578860:          1   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])
            perf  8562 [000] 347303.578861:         11   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])
            perf  8562 [001] 347303.578903:          1   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])
            perf  8562 [001] 347303.578905:          1   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])
            perf  8562 [001] 347303.578906:         15   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])
            perf  8562 [002] 347303.578952:          1   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])
            perf  8562 [002] 347303.578953:          1   cycles:  ffffffff9a477308 native_write_msr+0x8 ([kernel.kallsyms])

Filter the traced records by hex address ffffffff9a477308.

  root@kbl-ppc:~# ./perf script -S ffffffff9a4dd4ce,ffffffff9a4d2de9,ffffffff9a6bf9f4
            perf  8562 [001] 347303.578911:     311706   cycles:  ffffffff9a6bf9f4 __kmalloc_node+0x204 ([kernel.kallsyms])
            perf  8562 [002] 347303.578960:     354477   cycles:  ffffffff9a4d2de9 sched_setaffinity+0x49 ([kernel.kallsyms])
            perf  8562 [003] 347303.579015:     450958   cycles:  ffffffff9a4dd4ce dequeue_task_fair+0x1ae ([kernel.kallsyms])

Filter the traced records by hex address ffffffff9a4dd4ce, ffffffff9a4d2de9, ffffffff9a6bf9f4.

  root@kbl-ppc:~# ./perf script -S ffffffff9a477309 --addr-range 16
            perf  8562 [000] 347303.578863:        291   cycles:  ffffffff9a47730a native_write_msr+0xa ([kernel.kallsyms])
            perf  8562 [001] 347303.578907:        411   cycles:  ffffffff9a47730a native_write_msr+0xa ([kernel.kallsyms])
            perf  8562 [002] 347303.578956:        462   cycles:  ffffffff9a47730f native_write_msr+0xf ([kernel.kallsyms])
            perf  8562 [003] 347303.579010:        497   cycles:  ffffffff9a47730f native_write_msr+0xf ([kernel.kallsyms])
            perf  8562 [004] 347303.579059:        429   cycles:  ffffffff9a47730f native_write_msr+0xf ([kernel.kallsyms])
            perf  8562 [005] 347303.579109:        408   cycles:  ffffffff9a47730a native_write_msr+0xa ([kernel.kallsyms])
            perf  8562 [006] 347303.579159:        460   cycles:  ffffffff9a47730f native_write_msr+0xf ([kernel.kallsyms])
            perf  8562 [007] 347303.579213:        436   cycles:  ffffffff9a47730f native_write_msr+0xf ([kernel.kallsyms])

Filter the traced records from address range [ffffffff9a477309, ffffffff9a477309 + 15].

  root@kbl-ppc:~# ./perf script -S "ffffffff9b163046,rcu_nmi_exit"
            perf  8562 [004] 347303.579060:      12013   cycles:  ffffffff9b163046 exc_nmi+0x166 ([kernel.kallsyms])
            perf  8562 [007] 347303.579214:      12138   cycles:  ffffffff9b165944 rcu_nmi_exit+0x34 ([kernel.kallsyms])

Filter by address + symbol

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210207080935.31784-2-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2021-02-07 16:09:35 +08:00 committed by Arnaldo Carvalho de Melo
parent 94253393df
commit 61d9fc4449
5 changed files with 98 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
tools/perf/Documentation/perf-script.txt
View File

@ -422,9 +422,29 @@ include::itrace.txt[]
Only consider the listed symbols. Symbols are typically a name
but they may also be hexadecimal address.
The hexadecimal address may be the start address of a symbol or
any other address to filter the trace records
For example, to select the symbol noploop or the address 0x4007a0:
perf script --symbols=noploop,0x4007a0
Support filtering trace records by symbol name, start address of
symbol, any hexadecimal address and address range.
The comparison order is:
1. symbol name comparison
2. symbol start address comparison.
3. any hexadecimal address comparison.
4. address range comparison (see --addr-range).
--addr-range::
Use with -S or --symbols to list traced records within address range.
For example, to list the traced records within the address range
[0x4007a0, 0x0x4007a9]:
perf script -S 0x4007a0 --addr-range 10
--dsos=::
Only consider symbols in these DSOs.

2
tools/perf/builtin-script.c
View File

@ -3552,6 +3552,8 @@ int cmd_script(int argc, const char **argv)
"only consider symbols in these DSOs"),
OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
"only consider these symbols"),
OPT_INTEGER(0, "addr-range", &symbol_conf.addr_range,
"Use with -S to list traced records within address range"),
OPT_CALLBACK_OPTARG(0, "insn-trace", &itrace_synth_opts, NULL, NULL,
"Decode instructions from itrace", parse_insn_trace),
OPT_CALLBACK_OPTARG(0, "xed", NULL, NULL, NULL,

24
tools/perf/util/event.c
View File

@ -645,6 +645,19 @@ struct symbol *thread__find_symbol_fb(struct thread *thread, u8 cpumode,
return al->sym;
}
static bool check_address_range(struct intlist *addr_list, int addr_range,
unsigned long addr)
{
struct int_node *pos;
intlist__for_each_entry(pos, addr_list) {
if (addr >= pos->i && addr < pos->i + addr_range)
return true;
}
return false;
}
/*
* Callers need to drop the reference to al->thread, obtained in
* machine__findnew_thread()
@ -711,6 +724,17 @@ int machine__resolve(struct machine *machine, struct addr_location *al,
ret = strlist__has_entry(symbol_conf.sym_list,
al_addr_str);
}
if (!ret && symbol_conf.addr_list && al->map) {
unsigned long addr = al->map->unmap_ip(al->map, al->addr);
ret = intlist__has_entry(symbol_conf.addr_list, addr);
if (!ret && symbol_conf.addr_range) {
ret = check_address_range(symbol_conf.addr_list,
symbol_conf.addr_range,
addr);
}
}
if (!ret)
al->filtered |= (1 << HIST_FILTER__SYMBOL);
}

49
tools/perf/util/symbol.c
View File

@ -2406,6 +2406,49 @@ int setup_intlist(struct intlist **list, const char *list_str,
return 0;
}
static int setup_addrlist(struct intlist **addr_list, struct strlist *sym_list)
{
struct str_node *pos, *tmp;
unsigned long val;
char *sep;
const char *end;
int i = 0, err;
*addr_list = intlist__new(NULL);
if (!*addr_list)
return -1;
strlist__for_each_entry_safe(pos, tmp, sym_list) {
errno = 0;
val = strtoul(pos->s, &sep, 16);
if (errno || (sep == pos->s))
continue;
if (*sep != '\0') {
end = pos->s + strlen(pos->s) - 1;
while (end >= sep && isspace(*end))
end--;
if (end >= sep)
continue;
}
err = intlist__add(*addr_list, val);
if (err)
break;
strlist__remove(sym_list, pos);
i++;
}
if (i == 0) {
intlist__delete(*addr_list);
*addr_list = NULL;
}
return 0;
}
static bool symbol__read_kptr_restrict(void)
{
bool value = false;
@ -2489,6 +2532,10 @@ int symbol__init(struct perf_env *env)
symbol_conf.sym_list_str, "symbol") < 0)
goto out_free_tid_list;
if (symbol_conf.sym_list &&
setup_addrlist(&symbol_conf.addr_list, symbol_conf.sym_list) < 0)
goto out_free_sym_list;
if (setup_list(&symbol_conf.bt_stop_list,
symbol_conf.bt_stop_list_str, "symbol") < 0)
goto out_free_sym_list;
@ -2512,6 +2559,7 @@ int symbol__init(struct perf_env *env)
out_free_sym_list:
strlist__delete(symbol_conf.sym_list);
intlist__delete(symbol_conf.addr_list);
out_free_tid_list:
intlist__delete(symbol_conf.tid_list);
out_free_pid_list:
@ -2533,6 +2581,7 @@ void symbol__exit(void)
strlist__delete(symbol_conf.comm_list);
intlist__delete(symbol_conf.tid_list);
intlist__delete(symbol_conf.pid_list);
intlist__delete(symbol_conf.addr_list);
vmlinux_path__exit();
symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
symbol_conf.bt_stop_list = NULL;

4
tools/perf/util/symbol_conf.h
View File

@ -70,11 +70,13 @@ struct symbol_conf {
*sym_to_list,
*bt_stop_list;
struct intlist *pid_list,
*tid_list;
*tid_list,
*addr_list;
const char *symfs;
int res_sample;
int pad_output_len_dso;
int group_sort_idx;
int addr_range;
};
extern struct symbol_conf symbol_conf;