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Date: Thu, 02 Apr 2015 12:01:53 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Jiri Olsa <jolsa@...hat.com>, Peter Zijlstra <peterz@...radead.org>
CC: David Ahern <dsahern@...il.com>,
Stephane Eranian <eranian@...gle.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Linus Torvalds <torvalds@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>,
John Stultz <john.stultz@...aro.org>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC][PATCH] perf tools: unify perf_event_attr printing
On 01/04/15 19:52, Jiri Olsa wrote:
> On Wed, Apr 01, 2015 at 06:26:38PM +0200, Peter Zijlstra wrote:
>>
>> With some feedback from Jolsa, who showed me how to trigger the actual
>> outputs.
>
> adding Adrian to CC as he's the original author AFAIK
I wanted a compact format, and the omission of null/zero values achieves that.
But personally I think the "include" approach is too ugly. I would just
add a function instead. Something like:
#define p_unsigned(val) snprintf(value_buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
#define PRINT_ATTRN(name, field, print) \
if (!skip_zero || attr->field) { \
snprintf(name_buf, BUF_SIZE, name); \
print(attr->field); \
prt(name_buf, value_buf, priv); \
}
#define PRINT_ATTR(field, print) PRINT_ATTRN(#field, field, print)
typedef int (*attr_print_cb_t)(const char *name, const char *value, void *priv);
int perf_event_attr__print(struct perf_event_attr *attr, attr_print_cb_t prt, bool skip_zero, void *priv)
{
char name_buf[BUF_SIZE];
char value_buf[BUF_SIZE];
int err;
PRINT_ATTR(type, p_unsigned);
etc
return 0;
}
Then it calling it looks like:
static int perf_event_attr__fprintf_one(const char *name, const char *value, void *priv)
{
size_t *ret = priv;
*ret += fprintf(fp, " %-32s %s\n", name, value);
return 0;
}
static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
{
size_t ret = 0;
ret += fprintf(fp, "%.60s\n", graph_dotted_line);
ret += fprintf(fp, "perf_event_attr:\n");
perf_event_attr__print(attr, perf_event_attr__fprintf_one, true, &ret);
ret += fprintf(fp, "%.60s\n", graph_dotted_line);
return ret;
}
>
> jirka
>
>>
>> ---
>>
>> Subject: perf, tools: Merge all perf_event_attr print functions
>> From: Peter Zijlstra <peterz@...radead.org>
>> Date: Tue Mar 31 13:01:54 CEST 2015
>>
>> Currently there's 3 (that I found) different and incomplete
>> implementations of printing perf_event_attr.
>>
>> This is quite silly. Merge the lot.
>>
>> While this patch does not retain the exact form all printing that I
>> found is debug output and thus it should not be critical.
>>
>> Also, I cannot find a single print_event_desc() caller.
>>
>> Pre:
>>
>> $ perf record -vv -e cycles -- sleep 1
>> ------------------------------------------------------------
>> perf_event_attr:
>> type 0
>> size 104
>> config 0
>> sample_period 4000
>> sample_freq 4000
>> sample_type 0x107
>> read_format 0
>> disabled 1 inherit 1
>> pinned 0 exclusive 0
>> exclude_user 0 exclude_kernel 0
>> exclude_hv 0 exclude_idle 0
>> mmap 1 comm 1
>> mmap2 1 comm_exec 1
>> freq 1 inherit_stat 0
>> enable_on_exec 1 task 1
>> watermark 0 precise_ip 0
>> mmap_data 0 sample_id_all 1
>> exclude_host 0 exclude_guest 1
>> excl.callchain_kern 0 excl.callchain_user 0
>> wakeup_events 0
>> wakeup_watermark 0
>> bp_type 0
>> bp_addr 0
>> config1 0
>> bp_len 0
>> config2 0
>> branch_sample_type 0
>> sample_regs_user 0
>> sample_stack_user 0
>> sample_regs_intr 0
>> ------------------------------------------------------------
>>
>> $ perf evlist -vv
>> cycles: sample_freq=4000, size: 104, sample_type: IP|TID|TIME|PERIOD,
>> disabled: 1, inherit: 1, mmap: 1, mmap2: 1, comm: 1, comm_exec: 1,
>> freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest:
>> 1
>>
>> Post:
>>
>> $ ./perf record -vv -e cycles -- sleep 1
>> ------------------------------------------------------------
>> perf_event_attr:
>> size 112
>> { sample_period, sample_freq } 4000
>> sample_type IP|TID|TIME|PERIOD
>> disabled 1
>> inherit 1
>> mmap 1
>> comm 1
>> freq 1
>> enable_on_exec 1
>> task 1
>> sample_id_all 1
>> exclude_guest 1
>> mmap2 1
>> comm_exec 1
>> ------------------------------------------------------------
>>
>> $ ./perf evlist -vv
>> cycles: size: 112, { sample_period, sample_freq }: 4000, sample_type:
>> IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq:
>> 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1,
>> mmap2: 1, comm_exec: 1
>>
>> Cc: acme@...hat.com
>> Cc: jolsa@...hat.com
>> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
>> ---
>> tools/perf/util/Build | 1
>> tools/perf/util/evsel.c | 181 ++++++-----------------------------------
>> tools/perf/util/header.c | 34 ++-----
>> tools/perf/util/print_attr.h | 69 +++++++++++++++
>> tools/perf/util/print_helper.c | 52 +++++++++++
>> tools/perf/util/print_helper.h | 7 +
>> 6 files changed, 170 insertions(+), 174 deletions(-)
>>
>> --- a/tools/perf/util/Build
>> +++ b/tools/perf/util/Build
>> @@ -74,6 +74,7 @@ libperf-y += data.o
>> libperf-$(CONFIG_X86) += tsc.o
>> libperf-y += cloexec.o
>> libperf-y += thread-stack.o
>> +libperf-y += print_helper.o
>>
>> libperf-$(CONFIG_LIBELF) += symbol-elf.o
>> libperf-$(CONFIG_LIBELF) += probe-event.o
>> --- a/tools/perf/util/evsel.c
>> +++ b/tools/perf/util/evsel.c
>> @@ -26,6 +26,7 @@
>> #include "perf_regs.h"
>> #include "debug.h"
>> #include "trace-event.h"
>> +#include "print_helper.h"
>>
>> static struct {
>> bool sample_id_all;
>> @@ -1011,21 +1012,6 @@ static int get_group_fd(struct perf_evse
>> return fd;
>> }
>>
>> -#define __PRINT_ATTR(fmt, cast, field) \
>> - fprintf(fp, " %-19s "fmt"\n", #field, cast attr->field)
>> -
>> -#define PRINT_ATTR_U32(field) __PRINT_ATTR("%u" , , field)
>> -#define PRINT_ATTR_X32(field) __PRINT_ATTR("%#x", , field)
>> -#define PRINT_ATTR_U64(field) __PRINT_ATTR("%" PRIu64, (uint64_t), field)
>> -#define PRINT_ATTR_X64(field) __PRINT_ATTR("%#"PRIx64, (uint64_t), field)
>> -
>> -#define PRINT_ATTR2N(name1, field1, name2, field2) \
>> - fprintf(fp, " %-19s %u %-19s %u\n", \
>> - name1, attr->field1, name2, attr->field2)
>> -
>> -#define PRINT_ATTR2(field1, field2) \
>> - PRINT_ATTR2N(#field1, field1, #field2, field2)
>> -
>> static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
>> {
>> size_t ret = 0;
>> @@ -1033,42 +1019,18 @@ static size_t perf_event_attr__fprintf(s
>> ret += fprintf(fp, "%.60s\n", graph_dotted_line);
>> ret += fprintf(fp, "perf_event_attr:\n");
>>
>> - ret += PRINT_ATTR_U32(type);
>> - ret += PRINT_ATTR_U32(size);
>> - ret += PRINT_ATTR_X64(config);
>> - ret += PRINT_ATTR_U64(sample_period);
>> - ret += PRINT_ATTR_U64(sample_freq);
>> - ret += PRINT_ATTR_X64(sample_type);
>> - ret += PRINT_ATTR_X64(read_format);
>> -
>> - ret += PRINT_ATTR2(disabled, inherit);
>> - ret += PRINT_ATTR2(pinned, exclusive);
>> - ret += PRINT_ATTR2(exclude_user, exclude_kernel);
>> - ret += PRINT_ATTR2(exclude_hv, exclude_idle);
>> - ret += PRINT_ATTR2(mmap, comm);
>> - ret += PRINT_ATTR2(freq, inherit_stat);
>> - ret += PRINT_ATTR2(enable_on_exec, task);
>> - ret += PRINT_ATTR2(watermark, precise_ip);
>> - ret += PRINT_ATTR2(mmap_data, sample_id_all);
>> - ret += PRINT_ATTR2(exclude_host, exclude_guest);
>> - ret += PRINT_ATTR2N("excl.callchain_kern", exclude_callchain_kernel,
>> - "excl.callchain_user", exclude_callchain_user);
>> - ret += PRINT_ATTR2(mmap2, comm_exec);
>> - ret += __PRINT_ATTR("%u",,use_clockid);
>> -
>> -
>> - ret += PRINT_ATTR_U32(wakeup_events);
>> - ret += PRINT_ATTR_U32(wakeup_watermark);
>> - ret += PRINT_ATTR_X32(bp_type);
>> - ret += PRINT_ATTR_X64(bp_addr);
>> - ret += PRINT_ATTR_X64(config1);
>> - ret += PRINT_ATTR_U64(bp_len);
>> - ret += PRINT_ATTR_X64(config2);
>> - ret += PRINT_ATTR_X64(branch_sample_type);
>> - ret += PRINT_ATTR_X64(sample_regs_user);
>> - ret += PRINT_ATTR_U32(sample_stack_user);
>> - ret += PRINT_ATTR_U32(clockid);
>> - ret += PRINT_ATTR_X64(sample_regs_intr);
>> +#define PRINT_ATTR(_n, _f, _p) \
>> +do { \
>> + if (attr->_f) { \
>> + ret += fprintf(fp, " %-32s ", _n); \
>> + ret += _p(fp, attr->_f); \
>> + ret += fprintf(fp, "\n"); \
>> + } \
>> +} while (0)
>> +
>> +#include "util/print_attr.h"
>> +
>> +#undef PRINT_ATTR
>>
>> ret += fprintf(fp, "%.60s\n", graph_dotted_line);
>>
>> @@ -1996,64 +1958,6 @@ static int comma_fprintf(FILE *fp, bool
>> return ret;
>> }
>>
>> -static int __if_fprintf(FILE *fp, bool *first, const char *field, u64 value)
>> -{
>> - if (value == 0)
>> - return 0;
>> -
>> - return comma_fprintf(fp, first, " %s: %" PRIu64, field, value);
>> -}
>> -
>> -#define if_print(field) printed += __if_fprintf(fp, &first, #field, evsel->attr.field)
>> -
>> -struct bit_names {
>> - int bit;
>> - const char *name;
>> -};
>> -
>> -static int bits__fprintf(FILE *fp, const char *field, u64 value,
>> - struct bit_names *bits, bool *first)
>> -{
>> - int i = 0, printed = comma_fprintf(fp, first, " %s: ", field);
>> - bool first_bit = true;
>> -
>> - do {
>> - if (value & bits[i].bit) {
>> - printed += fprintf(fp, "%s%s", first_bit ? "" : "|", bits[i].name);
>> - first_bit = false;
>> - }
>> - } while (bits[++i].name != NULL);
>> -
>> - return printed;
>> -}
>> -
>> -static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
>> -{
>> -#define bit_name(n) { PERF_SAMPLE_##n, #n }
>> - struct bit_names bits[] = {
>> - bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
>> - bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
>> - bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
>> - bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
>> - bit_name(IDENTIFIER), bit_name(REGS_INTR),
>> - { .name = NULL, }
>> - };
>> -#undef bit_name
>> - return bits__fprintf(fp, "sample_type", value, bits, first);
>> -}
>> -
>> -static int read_format__fprintf(FILE *fp, bool *first, u64 value)
>> -{
>> -#define bit_name(n) { PERF_FORMAT_##n, #n }
>> - struct bit_names bits[] = {
>> - bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
>> - bit_name(ID), bit_name(GROUP),
>> - { .name = NULL, }
>> - };
>> -#undef bit_name
>> - return bits__fprintf(fp, "read_format", value, bits, first);
>> -}
>> -
>> int perf_evsel__fprintf(struct perf_evsel *evsel,
>> struct perf_attr_details *details, FILE *fp)
>> {
>> @@ -2080,51 +1984,24 @@ int perf_evsel__fprintf(struct perf_evse
>>
>> printed += fprintf(fp, "%s", perf_evsel__name(evsel));
>>
>> - if (details->verbose || details->freq) {
>> - printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
>> - (u64)evsel->attr.sample_freq);
>> - }
>>
>> if (details->verbose) {
>> - if_print(type);
>> - if_print(config);
>> - if_print(config1);
>> - if_print(config2);
>> - if_print(size);
>> - printed += sample_type__fprintf(fp, &first, evsel->attr.sample_type);
>> - if (evsel->attr.read_format)
>> - printed += read_format__fprintf(fp, &first, evsel->attr.read_format);
>> - if_print(disabled);
>> - if_print(inherit);
>> - if_print(pinned);
>> - if_print(exclusive);
>> - if_print(exclude_user);
>> - if_print(exclude_kernel);
>> - if_print(exclude_hv);
>> - if_print(exclude_idle);
>> - if_print(mmap);
>> - if_print(comm);
>> - if_print(freq);
>> - if_print(inherit_stat);
>> - if_print(enable_on_exec);
>> - if_print(task);
>> - if_print(watermark);
>> - if_print(precise_ip);
>> - if_print(mmap_data);
>> - if_print(sample_id_all);
>> - if_print(exclude_host);
>> - if_print(exclude_guest);
>> - if_print(mmap2);
>> - if_print(comm_exec);
>> - if_print(use_clockid);
>> - if_print(__reserved_1);
>> - if_print(wakeup_events);
>> - if_print(bp_type);
>> - if_print(branch_sample_type);
>> - if_print(sample_regs_user);
>> - if_print(sample_stack_user);
>> - if_print(clockid);
>> - if_print(sample_regs_intr);
>> +
>> +#define PRINT_ATTR(_n, _f, _p) \
>> +do { \
>> + if (evsel->attr._f) { \
>> + printed += comma_fprintf(fp, &first, " %s: ", _n); \
>> + printed += _p(fp, evsel->attr._f); \
>> + } \
>> +} while (0)
>> +
>> +#include "util/print_attr.h"
>> +
>> +#undef PRINT_ATTR
>> +
>> + } else if (details->freq) {
>> + printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
>> + (u64)evsel->attr.sample_freq);
>> }
>> out:
>> fputc('\n', fp);
>> --- a/tools/perf/util/header.c
>> +++ b/tools/perf/util/header.c
>> @@ -23,6 +23,7 @@
>> #include "strbuf.h"
>> #include "build-id.h"
>> #include "data.h"
>> +#include "print_helper.h"
>>
>> static u32 header_argc;
>> static const char **header_argv;
>> @@ -1069,26 +1070,6 @@ static void print_event_desc(struct perf
>> for (evsel = events; evsel->attr.size; evsel++) {
>> fprintf(fp, "# event : name = %s, ", evsel->name);
>>
>> - fprintf(fp, "type = %d, config = 0x%"PRIx64
>> - ", config1 = 0x%"PRIx64", config2 = 0x%"PRIx64,
>> - evsel->attr.type,
>> - (u64)evsel->attr.config,
>> - (u64)evsel->attr.config1,
>> - (u64)evsel->attr.config2);
>> -
>> - fprintf(fp, ", excl_usr = %d, excl_kern = %d",
>> - evsel->attr.exclude_user,
>> - evsel->attr.exclude_kernel);
>> -
>> - fprintf(fp, ", excl_host = %d, excl_guest = %d",
>> - evsel->attr.exclude_host,
>> - evsel->attr.exclude_guest);
>> -
>> - fprintf(fp, ", precise_ip = %d", evsel->attr.precise_ip);
>> -
>> - fprintf(fp, ", attr_mmap2 = %d", evsel->attr.mmap2);
>> - fprintf(fp, ", attr_mmap = %d", evsel->attr.mmap);
>> - fprintf(fp, ", attr_mmap_data = %d", evsel->attr.mmap_data);
>> if (evsel->ids) {
>> fprintf(fp, ", id = {");
>> for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
>> @@ -1098,9 +1079,18 @@ static void print_event_desc(struct perf
>> }
>> fprintf(fp, " }");
>> }
>> - if (evsel->attr.use_clockid)
>> - fprintf(fp, ", clockid = %d", evsel->attr.clockid);
>>
>> +#define PRINT_ATTR(_n, _f, _p) \
>> +do { \
>> + if (evsel->attr._f) { \
>> + fprintf(fp, ", %s =", _n); \
>> + _p(fp, evsel->attr._f); \
>> + } \
>> +} while (0)
>> +
>> +#include "util/print_attr.h"
>> +
>> +#undef PRINT_ATTR
>>
>> fputc('\n', fp);
>> }
>> --- /dev/null
>> +++ b/tools/perf/util/print_attr.h
>> @@ -0,0 +1,69 @@
>> +
>> +#ifndef PRINT_ATTR
>> +/*
>> + * #define PRINT_ATTR(name, field, print) \
>> + * do { \
>> + * fprintf(fp, " %s = ", name); \
>> + * print(fp, attr->field); \
>> + * } while (0)
>> + */
>> +#error "General Error and Major Fault yell at you!"
>> +#endif
>> +
>> +#define p_hex(fp, val) fprintf(fp, "%"PRIx64, (uint64_t)(val))
>> +#define p_unsigned(fp, val) fprintf(fp, "%"PRIu64, (uint64_t)(val))
>> +#define p_signed(fp, val) fprintf(fp, "%"PRId64, (int64_t)(val))
>> +#define p_sample_type(fp, val) sample_type__fprintf(fp, val)
>> +#define p_read_format(fp, val) read_format__fprintf(fp, val)
>> +
>> +#define PRINT_ATTRf(field, print) PRINT_ATTR(#field, field, print)
>> +
>> +PRINT_ATTRf(type, p_unsigned);
>> +PRINT_ATTRf(size, p_unsigned);
>> +PRINT_ATTRf(config, p_hex);
>> +PRINT_ATTR("{ sample_period, sample_freq }", sample_period, p_unsigned);
>> +PRINT_ATTRf(sample_type, p_sample_type);
>> +PRINT_ATTRf(read_format, p_read_format);
>> +
>> +PRINT_ATTRf(disabled, p_unsigned);
>> +PRINT_ATTRf(inherit, p_unsigned);
>> +PRINT_ATTRf(pinned, p_unsigned);
>> +PRINT_ATTRf(exclusive, p_unsigned);
>> +PRINT_ATTRf(exclude_user, p_unsigned);
>> +PRINT_ATTRf(exclude_kernel, p_unsigned);
>> +PRINT_ATTRf(exclude_hv, p_unsigned);
>> +PRINT_ATTRf(exclude_idle, p_unsigned);
>> +PRINT_ATTRf(mmap, p_unsigned);
>> +PRINT_ATTRf(comm, p_unsigned);
>> +PRINT_ATTRf(freq, p_unsigned);
>> +PRINT_ATTRf(inherit_stat, p_unsigned);
>> +PRINT_ATTRf(enable_on_exec, p_unsigned);
>> +PRINT_ATTRf(task, p_unsigned);
>> +PRINT_ATTRf(watermark, p_unsigned);
>> +PRINT_ATTRf(precise_ip, p_unsigned);
>> +PRINT_ATTRf(mmap_data, p_unsigned);
>> +PRINT_ATTRf(sample_id_all, p_unsigned);
>> +PRINT_ATTRf(exclude_host, p_unsigned);
>> +PRINT_ATTRf(exclude_guest, p_unsigned);
>> +PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
>> +PRINT_ATTRf(exclude_callchain_user, p_unsigned);
>> +PRINT_ATTRf(mmap2, p_unsigned);
>> +PRINT_ATTRf(comm_exec, p_unsigned);
>> +PRINT_ATTRf(use_clockid, p_unsigned);
>> +
>> +PRINT_ATTR("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
>> +PRINT_ATTRf(bp_type, p_unsigned);
>> +PRINT_ATTR("{ bp_addr, config1 }", bp_addr, p_hex);
>> +PRINT_ATTR("{ bp_len, config2 }", bp_len, p_hex);
>> +PRINT_ATTRf(sample_regs_user, p_hex);
>> +PRINT_ATTRf(sample_stack_user, p_unsigned);
>> +PRINT_ATTRf(clockid, p_signed);
>> +PRINT_ATTRf(sample_regs_intr, p_hex);
>> +
>> +#undef PRINT_ATTRf
>> +
>> +#undef p_hex
>> +#undef p_unsigned
>> +#undef p_signed
>> +#undef p_sample_type
>> +#undef p_read_format
>> --- /dev/null
>> +++ b/tools/perf/util/print_helper.c
>> @@ -0,0 +1,52 @@
>> +
>> +#include <linux/perf_event.h>
>> +#include "util.h"
>> +#include "print_helper.h"
>> +
>> +struct bit_names {
>> + int bit;
>> + const char *name;
>> +};
>> +
>> +static int bits__fprintf(FILE *fp, u64 value, struct bit_names *bits)
>> +{
>> + int i = 0, printed = 0;
>> + bool first_bit = true;
>> +
>> + do {
>> + if (value & bits[i].bit) {
>> + printed += fprintf(fp, "%s%s", first_bit ? "" : "|", bits[i].name);
>> + first_bit = false;
>> + }
>> + } while (bits[++i].name != NULL);
>> +
>> + return printed;
>> +}
>> +
>> +int sample_type__fprintf(FILE *fp, u64 value)
>> +{
>> +#define bit_name(n) { PERF_SAMPLE_##n, #n }
>> + struct bit_names bits[] = {
>> + bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
>> + bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
>> + bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
>> + bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
>> + bit_name(IDENTIFIER), bit_name(REGS_INTR),
>> + { .name = NULL, }
>> + };
>> +#undef bit_name
>> + return bits__fprintf(fp, value, bits);
>> +}
>> +
>> +int read_format__fprintf(FILE *fp, u64 value)
>> +{
>> +#define bit_name(n) { PERF_FORMAT_##n, #n }
>> + struct bit_names bits[] = {
>> + bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
>> + bit_name(ID), bit_name(GROUP),
>> + { .name = NULL, }
>> + };
>> +#undef bit_name
>> + return bits__fprintf(fp, value, bits);
>> +}
>> +
>> --- /dev/null
>> +++ b/tools/perf/util/print_helper.h
>> @@ -0,0 +1,7 @@
>> +#ifndef PRINT_HELPER_H
>> +#define PRINT_HELPER_H
>> +
>> +extern int sample_type__fprintf(FILE *fp, u64 value);
>> +extern int read_format__fprintf(FILE *fp, u64 value);
>> +
>> +#endif
>
>
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