Make cygprofile use clock_gettime() instead of gettimeofday().

Some of the generated orderfiles looked suspicious. I could observe that one of
them had the renderer PID show up before the browser one.

The mergetraces.py file was also occasionally complaining about unsorted
timestamps.

There are not many situations where gettimeofday() should be used instead of
clock_gettime(). The former is not monotonic in particular.
The original code also had the issue that it was using both gettimeofday() and 
time().

This also replaces the occurrences of 'ms(ec)' with 'us(ec)' to make it clear
that microseconds are used as opposed to milliseconds.

BUG=372323

Review URL: https://codereview.chromium.org/272393004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270090 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 4 deletions

diff --git a/tools/cygprofile/cygprofile.cc b/tools/cygprofile/cygprofile.cc
index 2086bea..980fa9e 100644
--- a/tools/cygprofile/cygprofile.cc
+++ b/tools/cygprofile/cygprofile.cc
@@ -208,7 +208,7 @@ CygCommon::CygCommon() {
     }
   }
   mapsfile.close();
-  header_line_.append("\nsecs\tmsecs\tpid:threadid\tfunc\n");
+  header_line_.append("\nsecs\tusecs\tpid:threadid\tfunc\n");
 }
 
 void CygTlsLog::LogEnter(void* this_fn) {
@@ -222,9 +222,9 @@ void CygTlsLog::LogEnter(void* this_fn) {
     base::AutoLock lock(log_mutex_);
     if (buf_.capacity() < kBufMaxSize)
       buf_.reserve(kBufMaxSize);
-    struct timeval timestamp;
-    gettimeofday(&timestamp, NULL);
-    buf_.push_back(CygLogEntry(time(NULL), timestamp.tv_usec,
+    struct timespec timestamp;
+    clock_gettime(CLOCK_MONOTONIC, &timestamp);
+    buf_.push_back(CygLogEntry(timestamp.tv_sec, timestamp.tv_nsec / 1000,
                                getpid(), pthread_self(), this_fn));
     if (buf_.size() == kBufMaxSize) {
       FlushLog();