Messages in this thread Patch in this message | | | From | paulmck@kernel ... | Subject | [PATCH tip/core/rcu 07/30] refperf: Allow decimal nanoseconds | Date | Mon, 22 Jun 2020 17:29:50 -0700 |
| |
From: "Paul E. McKenney" <paulmck@kernel.org>
The CONFIG_PREEMPT=n rcu_read_lock()/rcu_read_unlock() pair's overhead, even including loop overhead, is far less than one nanosecond. Since logscale plots are not all that happy with zero values, provide picoseconds as decimals.
Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> --- kernel/rcu/refperf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/refperf.c b/kernel/rcu/refperf.c index 57c7b7a..e991d48 100644 --- a/kernel/rcu/refperf.c +++ b/kernel/rcu/refperf.c @@ -375,7 +375,7 @@ static int main_func(void *arg) if (torture_must_stop()) goto end; - reader_tasks[exp].result_avg = process_durations(exp) / ((exp + 1) * loops); + reader_tasks[exp].result_avg = 1000 * process_durations(exp) / ((exp + 1) * loops); } // Print the average of all experiments @@ -386,7 +386,7 @@ static int main_func(void *arg) strcat(buf, "Threads\tTime(ns)\n"); for (exp = 0; exp < nreaders; exp++) { - sprintf(buf1, "%d\t%llu\n", exp + 1, reader_tasks[exp].result_avg); + sprintf(buf1, "%d\t%llu.%03d\n", exp + 1, reader_tasks[exp].result_avg / 1000, (int)(reader_tasks[exp].result_avg % 1000)); strcat(buf, buf1); } -- 2.9.5
| |