Count overruns when profiling; change units to ns.

* lisp/profiler.el (profiler-sampling-interval): Change units
from ms to ns, multiplying the default by 1000000 so that
it remains 1 ms.
(profiler-report-cpu-line-format): Give enough room for
the maximum counters on 64-bit hosts.
(profiler-report-render-calltree-1): Call them "CPU samples",
not "Time (ms)", since they are not milliseconds now (and
never really were).
* src/profiler.c (handle_profiler_signal): Count sampling intervals, not ms.
Give extra weight to samples after overruns, to attempt to count
the time more accurately.
(setup_cpu_timer): Change sampling interval units from ms to ns, since
the underlying primitives nominally do ns.
(Fprofiler_cpu_start): Document the change.  Mention that
the sampling intervals are only approximate.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index a199a7b12e5..a7b35a8572d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,14 @@
+2012-10-02  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Count overruns when profiling; change units to ns.
+        * profiler.c (handle_profiler_signal): Count sampling intervals, not ms.
+        Give extra weight to samples after overruns, to attempt to count
+        the time more accurately.
+        (setup_cpu_timer): Change sampling interval units from ms to ns, since
+        the underlying primitives nominally do ns.
+        (Fprofiler_cpu_start): Document the change.  Mention that
+        the sampling intervals are only approximate.
+
 2012-10-02  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * frame.c (Fmake_terminal_frame): Prefer safer CONSP over !NILP.