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Catch up with increasing the resolution suitable for high-res kernel

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profiling from microseconds to nanoseconds in 1996.  Picoseconds are
already needed.

Describe the choice of units for the per-call times in detail.
This commit is contained in:
Bruce Evans 2005-10-07 11:58:46 +00:00
parent 45edbdccd7
commit 762116ae25
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151057
1 changed files with 13 additions and 3 deletions
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16
usr.bin/gprof/gprof.1
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@ -32,7 +32,7 @@
.\" @(#)gprof.1 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd June 20, 2004
.Dd October 7, 2005
.Dt GPROF 1
.Os
.Sh NAME
@ -111,9 +111,19 @@ Second, a flat profile is given,
similar to that provided by
.Xr prof 1 .
This listing gives the total execution times, the call counts,
the time in msec or usec the call spent in the routine itself, and
the time in msec or usec the call spent in the routine itself including
the time that the call spent in the routine itself, and
the time that the call spent in the routine itself including
its descendants.
The units for the per-call times are normally milliseconds,
but they are nanoseconds if the profiling clock frequency
is 10 million or larger,
and if a function appears to be never called then its total self time
is printed as a percentage in the self time per call column.
The very high profiling clock frequencies needed to get sufficient
accuracy in the per-call times for short-lived programs are only
implemented for
.Dq high resolution
(non-statistical) kernel profiling.
.Pp
Finally, an index of the function names is provided.
.Pp