diff options
| author |   Len Brown <len.brown@intel.com> | 2016-02-12 22:44:48 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2016-03-13 03:55:32 -0400 |
| commit | 2a0609c02e6558df6075f258af98a54a74b050ff (patch) | |
| tree | 66cc0732bd346840bacc34b2048f002c851658df /tools/power | |
| parent | tools/power turbostat: Decode MSR_MISC_PWR_MGMT (diff) | |
| download | linux-dev-2a0609c02e6558df6075f258af98a54a74b050ff.tar.xz linux-dev-2a0609c02e6558df6075f258af98a54a74b050ff.zip | |
tools/power turbostat: allow sub-sec intervals
turbostat -i interval_sec
will sample and display statistics every interval_sec.
interval_sec used to be a whole number of seconds,
but now we accept a decimal, as small as 0.001 sec (1 ms).
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'tools/power')
| -rw-r--r-- | tools/power/x86/turbostat/turbostat.8 | 2 | ||||
| -rw-r--r-- | tools/power/x86/turbostat/turbostat.c | 20 |
2 files changed, 17 insertions, 5 deletions
diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8 index 622db685b4f9..4d8f198f348f 100644 --- a/tools/power/x86/turbostat/turbostat.8 +++ b/tools/power/x86/turbostat/turbostat.8 @@ -34,7 +34,7 @@ name as necessary to disambiguate it from others is necessary. Note that option \fB--debug\fP displays additional system configuration information. Invoking this parameter more than once may also enable internal turbostat debug information. .PP -\fB--interval seconds\fP overrides the default 5-second measurement interval. +\fB--interval seconds\fP overrides the default 5.0 second measurement interval. .PP \fB--help\fP displays usage for the most common parameters. .PP diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index c600340dfc4e..e411cc435137 100644 --- a/tools/power/x86/turbostat/turbostat.c +++ b/tools/power/x86/turbostat/turbostat.c @@ -38,12 +38,13 @@ #include <string.h> #include <ctype.h> #include <sched.h> +#include <time.h> #include <cpuid.h> #include <linux/capability.h> #include <errno.h> char *proc_stat = "/proc/stat"; -unsigned int interval_sec = 5; +struct timespec interval_ts = {5, 0}; unsigned int debug; unsigned int rapl_joules; unsigned int summary_only; @@ -1728,7 +1729,7 @@ restart: re_initialize(); goto restart; } - sleep(interval_sec); + nanosleep(&interval_ts, NULL); retval = for_all_cpus(get_counters, ODD_COUNTERS); if (retval < -1) { exit(retval); @@ -1742,7 +1743,7 @@ restart: compute_average(EVEN_COUNTERS); format_all_counters(EVEN_COUNTERS); flush_stdout(); - sleep(interval_sec); + nanosleep(&interval_ts, NULL); retval = for_all_cpus(get_counters, EVEN_COUNTERS); if (retval < -1) { exit(retval); @@ -3347,7 +3348,18 @@ void cmdline(int argc, char **argv) help(); exit(1); case 'i': - interval_sec = atoi(optarg); + { + double interval = strtod(optarg, NULL); + + if (interval < 0.001) { + fprintf(stderr, "interval %f seconds is too small\n", + interval); + exit(2); + } + + interval_ts.tv_sec = interval; + interval_ts.tv_nsec = (interval - interval_ts.tv_sec) * 1000000000; + } break; case 'J': rapl_joules++; |