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[v3,2/5] kernel-shark-qt: Add kshark_convert_nano() function

Message ID 20181005183241.27026-3-ykaradzhov@vmware.com (mailing list archive)
State Accepted
Headers show
Series Final preparation before adding the KernelShark GUI | expand

Commit Message

Yordan Karadzhov Oct. 5, 2018, 6:33 p.m. UTC 
From: "Yordan Karadzhov (VMware)" <y.karadz@gmail.com>

kshark_convert_nano() is used to convert the original value of the
timestamp of the trace records (having nanosecond precision) into two
values representing the time in seconds and milliseconds.

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
---
 kernel-shark-qt/src/libkshark.c | 16 ++++++++++++++++
 kernel-shark-qt/src/libkshark.h |  2 ++
 2 files changed, 18 insertions(+)
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Patch

diff --git a/kernel-shark-qt/src/libkshark.c b/kernel-shark-qt/src/libkshark.c
index ef577e0..d9d1929 100644
--- a/kernel-shark-qt/src/libkshark.c
+++ b/kernel-shark-qt/src/libkshark.c
@@ -1084,6 +1084,22 @@  const char *kshark_get_info_easy(struct kshark_entry *entry)
 	return info;
 }
 
+/**
+ * @brief Convert the timestamp of the trace record (nanosecond precision) into
+ *	  seconds and microseconds.
+ *
+ * @param time: Input location for the timestamp.
+ * @param sec: Output location for the value of the seconds.
+ * @param usec: Output location for the value of the microseconds.
+ */
+void kshark_convert_nano(uint64_t time, uint64_t *sec, uint64_t *usec)
+{
+	uint64_t s;
+
+	*sec = s = time / 1000000000ULL;
+	*usec = (time - s * 1000000000ULL) / 1000;
+}
+
 /**
  * @brief Dump into a string the content of one entry. The function allocates
  *	  a null terminated string and returns a pointer to this string. The
diff --git a/kernel-shark-qt/src/libkshark.h b/kernel-shark-qt/src/libkshark.h
index f00a584..d24ed8c 100644
--- a/kernel-shark-qt/src/libkshark.h
+++ b/kernel-shark-qt/src/libkshark.h
@@ -160,6 +160,8 @@  const char *kshark_get_event_name_easy(struct kshark_entry *entry);
 
 const char *kshark_get_info_easy(struct kshark_entry *entry);
 
+void kshark_convert_nano(uint64_t time, uint64_t *sec, uint64_t *usec);
+
 char* kshark_dump_entry(const struct kshark_entry *entry);
 
 struct tep_record *kshark_read_at(struct kshark_context *kshark_ctx,