Reduce the amount of log generated with dtrace.

Remove extraneous ppid and errno logging.
Have better variable cleanup characteristics to reduce the amount of kernel
memory leaked while tracing.

Add more comments explaining how the process tracking is done

NOTRY=true
R=cmp@chromium.org
BUG=98636
TEST=


Review URL: https://chromiumcodereview.appspot.com/10440073

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@140425 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed