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authorArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2019-08-14 20:12:56 +0300
committerLen Brown <len.brown@intel.com>2019-08-31 14:48:39 -0400
commit6ee9fc63d2e7999f93a466e202ae3b557e9c739c (patch)
treeddef7adb017a37129fe07c30a35b1a8e6cb12fa3 /tools/power
parentc026c23629b825100fd4b8223227d9a395f9a56b (diff)
tools/power turbostat: do not enforce 1ms
Turbostat works by taking a snapshot of counters, sleeping, taking another snapshot, calculating deltas, and printing out the table. The sleep time is controlled via -i option or by user sending a signal or a character to stdin. In the latter case, turbostat always adds 1 ms sleep before it reads the counters, in order to avoid larger imprecisions in the results in prints. While the 1 ms delay may be a good idea for a "dumb" user, it is a problem for an "aware" user. I do thousands and thousands of measurements over a short period of time (like 2ms), and turbostat unconditionally adds a 1ms to my interval, so I cannot get what I really need. This patch removes the unconditional 1ms sleep. This is an expert user tool, after all, and non-experts will unlikely ever use it in the non-fixed interval mode anyway, so I think it is OK to remove the 1ms delay. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'tools/power')
-rw-r--r--tools/power/x86/turbostat/turbostat.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 095bd52cc086..7d72268e546d 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -39,7 +39,6 @@ FILE *outf;
int *fd_percpu;
struct timeval interval_tv = {5, 0};
struct timespec interval_ts = {5, 0};
-struct timespec one_msec = {0, 1000000};
unsigned int num_iterations;
unsigned int debug;
unsigned int quiet;
@@ -2994,8 +2993,6 @@ static void signal_handler (int signal)
fprintf(stderr, "SIGUSR1\n");
break;
}
- /* make sure this manually-invoked interval is at least 1ms long */
- nanosleep(&one_msec, NULL);
}
void setup_signal_handler(void)
@@ -3046,8 +3043,6 @@ void do_sleep(void)
rest.tv_nsec = (tout.tv_usec % 1000000) * 1000;
nanosleep(&rest, NULL);
}
- /* make sure this manually-invoked interval is at least 1ms long */
- nanosleep(&one_msec, NULL);
}
}