[PATCH v5 4/6] perf util: Create function to perform multiple time range checking

Jin Yao
2017-10-20T15:32:43Z

Previous patch supports the multiple time range.

For example, select the first and second 10% time slices.
perf report --time 10%/1,10%/2

We need a function to check if a timestamp is in the ranges of
[0, 10%) and [10%, 20%].

Note that it includes the last element in [10%, 20%] but it
doesn't include the last element in [0, 10%). It's to avoid
the overlap.

This patch implments a new function perf_time__ranges_skip_sample
for this checking.

Change log:
-----------
v4: Let perf_time__ranges_skip_sample be compatible with
perf_time__skip_sample when only one time range.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/time-utils.c | 28 ++++++++++++++++++++++++++++
tools/perf/util/time-utils.h | 3 +++
2 files changed, 31 insertions(+)

diff --git a/tools/perf/util/time-utils.c b/tools/perf/util/time-utils.c
index 79e4281..b380356 100644
--- a/tools/perf/util/time-utils.c
+++ b/tools/perf/util/time-utils.c
@@ -299,6 +299,34 @@ bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp)
return false;
}

+bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,
+ int num, u64 timestamp)
+{
+ struct perf_time_interval *ptime;
+ int i;
+
+ if ((timestamp == 0) || (num == 0))
+ return false;
+
+ if (num == 1)
+ return perf_time__skip_sample(&ptime_buf[0], timestamp);
+
+ /*
+ * start/end of multiple time ranges must be valid.
+ */
+ for (i = 0; i < num; i++) {
+ ptime = &ptime_buf[i];
+
+ if (timestamp >= ptime->start &&
+ ((timestamp < ptime->end && i < num - 1) ||
+ (timestamp <= ptime->end && i == num - 1))) {
+ break;
+ }
+ }
+
+ return (i == num) ? true : false;
+}
+
int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz)
{
u64 sec = timestamp / NSEC_PER_SEC;
diff --git a/tools/perf/util/time-utils.h b/tools/perf/util/time-utils.h
index fd018e2..de279ea 100644
--- a/tools/perf/util/time-utils.h
+++ b/tools/perf/util/time-utils.h
@@ -17,6 +17,9 @@ int perf_time__percent_parse_str(struct perf_time_interval *ptime_buf, int num,

bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp);

+bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,
+ int num, u64 timestamp);
+
int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);

int fetch_current_timestamp(char *buf, size_t sz);
--
2.7.4