提交 13a70f35 编写于 作者: J Jin Yao 提交者: Arnaldo Carvalho de Melo

perf tools: Create function to parse time percent

Current perf report/script/... have a --time option to limit the time
range of output. But right now it only supports absolute time, add
support for time percentage.

For example:

1. Select the second 10% time slice
   perf report --time 10%/2

2. Select from 0% to 10% time slice
   perf report --time 0%-10%

It also support the multiple time ranges.

3. Select the first and second 10% time slices
   perf report --time 10%/1,10%/2

4. Select from 0% to 10% and 30% to 40% slices
   perf report --time 0%-10%,30%-40%

Changelog:

v4: An issue is found. Following passes.
    perf script --time 10%/10x12321xsdfdasfdsafdsafdsa

    Now it uses strtol to replace atoi.

Committer notes:

This just puts in place the infrastructure, so the examples in this cset
comment will only work later, after more patches in this series are
applied.
Signed-off-by: NJin Yao <yao.jin@linux.intel.com>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1512738826-2628-4-git-send-email-yao.jin@linux.intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
上级 68588baf
......@@ -6,6 +6,7 @@
#include <time.h>
#include <errno.h>
#include <inttypes.h>
#include <math.h>
#include "perf.h"
#include "debug.h"
......@@ -60,11 +61,10 @@ static int parse_timestr_sec_nsec(struct perf_time_interval *ptime,
return 0;
}
int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)
static int split_start_end(char **start, char **end, const char *ostr, char ch)
{
char *start_str, *end_str;
char *d, *str;
int rc = 0;
if (ostr == NULL || *ostr == '\0')
return 0;
......@@ -74,25 +74,35 @@ int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)
if (str == NULL)
return -ENOMEM;
ptime->start = 0;
ptime->end = 0;
/* str has the format: <start>,<stop>
* variations: <start>,
* ,<stop>
* ,
*/
start_str = str;
d = strchr(start_str, ',');
d = strchr(start_str, ch);
if (d) {
*d = '\0';
++d;
}
end_str = d;
*start = start_str;
*end = end_str;
return 0;
}
int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)
{
char *start_str = NULL, *end_str;
int rc;
rc = split_start_end(&start_str, &end_str, ostr, ',');
if (rc || !start_str)
return rc;
ptime->start = 0;
ptime->end = 0;
rc = parse_timestr_sec_nsec(ptime, start_str, end_str);
free(str);
free(start_str);
/* make sure end time is after start time if it was given */
if (rc == 0 && ptime->end && ptime->end < ptime->start)
......@@ -104,6 +114,177 @@ int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr)
return rc;
}
static int parse_percent(double *pcnt, char *str)
{
char *c;
c = strchr(str, '%');
if (c)
*c = '\0';
else
return -1;
*pcnt = atof(str) / 100.0;
return 0;
}
static int percent_slash_split(char *str, struct perf_time_interval *ptime,
u64 start, u64 end)
{
char *p, *end_str;
double pcnt, start_pcnt, end_pcnt;
u64 total = end - start;
int i;
/*
* Example:
* 10%/2: select the second 10% slice and the third 10% slice
*/
/* We can modify this string since the original one is copied */
p = strchr(str, '/');
if (!p)
return -1;
*p = '\0';
if (parse_percent(&pcnt, str) < 0)
return -1;
p++;
i = (int)strtol(p, &end_str, 10);
if (*end_str)
return -1;
if (pcnt <= 0.0)
return -1;
start_pcnt = pcnt * (i - 1);
end_pcnt = pcnt * i;
if (start_pcnt < 0.0 || start_pcnt > 1.0 ||
end_pcnt < 0.0 || end_pcnt > 1.0) {
return -1;
}
ptime->start = start + round(start_pcnt * total);
ptime->end = start + round(end_pcnt * total);
return 0;
}
static int percent_dash_split(char *str, struct perf_time_interval *ptime,
u64 start, u64 end)
{
char *start_str = NULL, *end_str;
double start_pcnt, end_pcnt;
u64 total = end - start;
int ret;
/*
* Example: 0%-10%
*/
ret = split_start_end(&start_str, &end_str, str, '-');
if (ret || !start_str)
return ret;
if ((parse_percent(&start_pcnt, start_str) != 0) ||
(parse_percent(&end_pcnt, end_str) != 0)) {
free(start_str);
return -1;
}
free(start_str);
if (start_pcnt < 0.0 || start_pcnt > 1.0 ||
end_pcnt < 0.0 || end_pcnt > 1.0 ||
start_pcnt > end_pcnt) {
return -1;
}
ptime->start = start + round(start_pcnt * total);
ptime->end = start + round(end_pcnt * total);
return 0;
}
typedef int (*time_pecent_split)(char *, struct perf_time_interval *,
u64 start, u64 end);
static int percent_comma_split(struct perf_time_interval *ptime_buf, int num,
const char *ostr, u64 start, u64 end,
time_pecent_split func)
{
char *str, *p1, *p2;
int len, ret, i = 0;
str = strdup(ostr);
if (str == NULL)
return -ENOMEM;
len = strlen(str);
p1 = str;
while (p1 < str + len) {
if (i >= num) {
free(str);
return -1;
}
p2 = strchr(p1, ',');
if (p2)
*p2 = '\0';
ret = (func)(p1, &ptime_buf[i], start, end);
if (ret < 0) {
free(str);
return -1;
}
pr_debug("start time %d: %" PRIu64 ", ", i, ptime_buf[i].start);
pr_debug("end time %d: %" PRIu64 "\n", i, ptime_buf[i].end);
i++;
if (p2)
p1 = p2 + 1;
else
break;
}
free(str);
return i;
}
int perf_time__percent_parse_str(struct perf_time_interval *ptime_buf, int num,
const char *ostr, u64 start, u64 end)
{
char *c;
/*
* ostr example:
* 10%/2,10%/3: select the second 10% slice and the third 10% slice
* 0%-10%,30%-40%: multiple time range
*/
memset(ptime_buf, 0, sizeof(*ptime_buf) * num);
c = strchr(ostr, '/');
if (c) {
return percent_comma_split(ptime_buf, num, ostr, start,
end, percent_slash_split);
}
c = strchr(ostr, '-');
if (c) {
return percent_comma_split(ptime_buf, num, ostr, start,
end, percent_dash_split);
}
return -1;
}
bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp)
{
/* if time is not set don't drop sample */
......
......@@ -13,6 +13,9 @@ int parse_nsec_time(const char *str, u64 *ptime);
int perf_time__parse_str(struct perf_time_interval *ptime, const char *ostr);
int perf_time__percent_parse_str(struct perf_time_interval *ptime_buf, int num,
const char *ostr, u64 start, u64 end);
bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp);
int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);
......
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