MINOR: activity: add a line reporting the average CPU usage to "show activity"

It was missing from the output but is sometimes convenient to observe
and understand how incoming connections are distributed. The CPU usage
is reported as the instant measurement of 100-idle_pct for each thread,
and the average value is shown for the aggregated value.

This could be backported as it's helpful in certain troublehsooting
sessions.

diff --git a/src/activity.c b/src/activity.c
index 9d396cd9066a0ab7a46d47aa50f2e6d025a7cc6d..0e021b08e51894f776718719e8fb7688f9f125de 100644 (file)
--- a/src/activity.c
+++ b/src/activity.c
@@ -1109,6 +1109,7 @@ static int cli_io_handler_show_activity(struct appctx *appctx)
        chunk_appendf(&trash, "cpust_ms_tot:"); SHOW_TOT(thr, activity[thr].cpust_total / 2);
        chunk_appendf(&trash, "cpust_ms_1s:");  SHOW_TOT(thr, read_freq_ctr(&activity[thr].cpust_1s) / 2);
        chunk_appendf(&trash, "cpust_ms_15s:"); SHOW_TOT(thr, read_freq_ctr_period(&activity[thr].cpust_15s, 15000) / 2);
+       chunk_appendf(&trash, "avg_cpu_pct:");  SHOW_AVG(thr, (100 - ha_thread_ctx[thr].idle_pct));
        chunk_appendf(&trash, "avg_loop_us:");  SHOW_AVG(thr, swrate_avg(activity[thr].avg_loop_us, TIME_STATS_SAMPLES));
        chunk_appendf(&trash, "accepted:");     SHOW_TOT(thr, activity[thr].accepted);
        chunk_appendf(&trash, "accq_pushed:");  SHOW_TOT(thr, activity[thr].accq_pushed);