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authorJin Yao <yao.jin@linux.intel.com>2018-01-10 23:00:31 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-01-17 10:23:36 -0300
commit5a031f887cb8d60fe87d21159c3cf82c38f55679 (patch)
tree851864630f93ec07caacfd091f2141e2a900b39c
parent7425664bbd3174814500c7ab8740cbb9bb25396c (diff)
perf util: Allocate time slices buffer according to number of comma
Previously we use a magic number 10 to limit the number of time slices. It's not very good. This patch creates a new function perf_time__range_alloc() to allocate time slices buffer. The number of buffer entries is determined by the number of comma in string but at least it will allocate one entry even if no comma is found. Signed-off-by: Jin Yao <yao.jin@linux.intel.com> Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Reviewed-by: Jiri Olsa <jolsa@redhat.com> 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/1515596433-24653-7-git-send-email-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/time-utils.c28
-rw-r--r--tools/perf/util/time-utils.h2
2 files changed, 30 insertions, 0 deletions
diff --git a/tools/perf/util/time-utils.c b/tools/perf/util/time-utils.c
index 5769f972c23e..6193b46050a5 100644
--- a/tools/perf/util/time-utils.c
+++ b/tools/perf/util/time-utils.c
@@ -325,6 +325,34 @@ int perf_time__percent_parse_str(struct perf_time_interval *ptime_buf, int num,
return -1;
}
+struct perf_time_interval *perf_time__range_alloc(const char *ostr, int *size)
+{
+ const char *p1, *p2;
+ int i = 1;
+ struct perf_time_interval *ptime;
+
+ /*
+ * At least allocate one time range.
+ */
+ if (!ostr)
+ goto alloc;
+
+ p1 = ostr;
+ while (p1 < ostr + strlen(ostr)) {
+ p2 = strchr(p1, ',');
+ if (!p2)
+ break;
+
+ p1 = p2 + 1;
+ i++;
+ }
+
+alloc:
+ *size = i;
+ ptime = calloc(i, sizeof(*ptime));
+ return ptime;
+}
+
bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp)
{
/* if time is not set don't drop sample */
diff --git a/tools/perf/util/time-utils.h b/tools/perf/util/time-utils.h
index 34d5eba26bf5..70b177d2b98c 100644
--- a/tools/perf/util/time-utils.h
+++ b/tools/perf/util/time-utils.h
@@ -16,6 +16,8 @@ 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);
+struct perf_time_interval *perf_time__range_alloc(const char *ostr, int *size);
+
bool perf_time__skip_sample(struct perf_time_interval *ptime, u64 timestamp);
bool perf_time__ranges_skip_sample(struct perf_time_interval *ptime_buf,