Author: ken
Date: Wed Apr 10 16:01:45 2013
New Revision: 249334
URL: http://svnweb.freebsd.org/changeset/base/249334
Log:
Fix a time calculation error in ctlstat_standard().
ctlstat.c: When converting a timeval to a floating point
number in ctlstat_standard(), cast the nanoseconds
calculation to a long double, so we don't lose
precision. Without the cast, we wind up with a
time in whole seconds only.
Sponsored by: Spectra Logic
MFC after: 3 days
Modified:
head/usr.bin/ctlstat/ctlstat.c
Modified: head/usr.bin/ctlstat/ctlstat.c
==============================================================================
--- head/usr.bin/ctlstat/ctlstat.c Wed Apr 10 11:26:30 2013
(r249333)
+++ head/usr.bin/ctlstat/ctlstat.c Wed Apr 10 16:01:45 2013
(r249334)
@@ -416,9 +416,10 @@ ctlstat_standard(struct ctlstat_context
if (F_CPU(ctx) && (getcpu(&ctx->cur_cpu) != 0))
errx(1, "error returned from getcpu()");
- cur_secs = ctx->cur_time.tv_sec + (ctx->cur_time.tv_nsec / 1000000000);
+ cur_secs = ctx->cur_time.tv_sec +
+ ((long double)ctx->cur_time.tv_nsec / 1000000000);
prev_secs = ctx->prev_time.tv_sec +
- (ctx->prev_time.tv_nsec / 1000000000);
+ ((long double)ctx->prev_time.tv_nsec / 1000000000);
etime = cur_secs - prev_secs;
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