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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2007-05-17 22:46:45 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2007-05-17 22:46:45 +0000 |
commit | c3330a88ee5d674b09dded32ef1ccba26a9c3034 (patch) | |
tree | f7f247449fc18bc299ef695c3503f9b7790db97a /cpukit/score/src/timespecdivide.c | |
parent | Add .rh clause to extra_arg. (diff) | |
download | rtems-c3330a88ee5d674b09dded32ef1ccba26a9c3034.tar.bz2 |
2007-05-17 Joel Sherrill <joel.sherrill@oarcorp.com>
* ChangeLog, configure.ac, libcsupport/src/__times.c,
libmisc/cpuuse/cpuuse.c, libmisc/stackchk/check.c,
rtems/include/rtems/rtems/ratemon.h, rtems/src/ratemongetstatus.c,
rtems/src/ratemonperiod.c, rtems/src/ratemonreportstatistics.c,
rtems/src/ratemonresetall.c, rtems/src/ratemontimeout.c,
score/Makefile.am, score/include/rtems/score/thread.h,
score/include/rtems/score/timespec.h, score/src/threaddispatch.c,
score/src/threadinitialize.c, score/src/threadtickletimeslice.c,
score/src/timespecdivide.c: Add nanoseconds granularity to the rate
monotonic period statistics and CPU usage statistics. This capability
is enabled by default although may be conditionally disabled by the
user. It could be too much overhead on small targets but it does not
appear to be bad in early testing. Its impact on code size has not
been evaluated either. It is possible that both forms of statistics
gathering could be disabled with further tweaking of the conditional
compilation.
* score/src/timespecdividebyinteger.c: New file.
Diffstat (limited to 'cpukit/score/src/timespecdivide.c')
-rw-r--r-- | cpukit/score/src/timespecdivide.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/cpukit/score/src/timespecdivide.c b/cpukit/score/src/timespecdivide.c index 0535c22e11..74d6cdbc78 100644 --- a/cpukit/score/src/timespecdivide.c +++ b/cpukit/score/src/timespecdivide.c @@ -23,30 +23,35 @@ #include <rtems/score/tod.h> void _Timespec_Divide( - const struct timespec *time, - uint32_t iterations, - struct timespec *result + const struct timespec *lhs, + const struct timespec *rhs, + uint32_t *ival_percentage, + uint32_t *fval_percentage ) { - uint64_t t; + uint64_t left, right, answer; /* * For math simplicity just convert the timespec to nanoseconds * in a 64-bit integer. */ - t = time->tv_sec * TOD_NANOSECONDS_PER_SECOND; - t += time->tv_nsec; + left = lhs->tv_sec * (uint64_t)TOD_NANOSECONDS_PER_SECOND; + left += lhs->tv_nsec; + right = rhs->tv_sec * (uint64_t)TOD_NANOSECONDS_PER_SECOND; + right += rhs->tv_nsec; - /* - * Divide to get nanoseconds per iteration - */ - - t /= iterations; + if ( rhs == 0 ) { + *ival_percentage = 0; + *ival_percentage = 0; + return; + } /* * Put it back in the timespec result */ - result->tv_sec = t / TOD_NANOSECONDS_PER_SECOND; - result->tv_nsec = t % TOD_NANOSECONDS_PER_SECOND; + answer = (left * 1000) / right; + + *fval_percentage = answer % 1000; + *ival_percentage = answer / 1000; } |