lpar plugin: Calculate "pool busy" from "pool idle", not the other way around.

diff --git a/src/lpar.c b/src/lpar.c
index ec39d5c..146aaf2 100644 (file)
--- a/src/lpar.c
+++ b/src/lpar.c
@@ -230,21 +230,25 @@ static int lpar_read (void)
        if (pool_stats)
        {
                char typinst[DATA_MAX_NAME_LEN];
-               u_longlong_t pool_busy_ns;
-               u_longlong_t pool_max_ns;
-               u_longlong_t pool_idle_ns = 0;
+               u_longlong_t pool_idle_ns;
+               double pool_idle_cpus;
+               double pool_busy_cpus;
+
+               /* We're calculating "busy" from "idle" and the total number of
+                * CPUs, because according to Aurélien Reynaud using the "busy"
+                * member yields values that differ from the values produced by
+                * the LPAR command line tools. --octo */
+               pool_idle_ns = lparstats.pool_idle_time - lparstats_old.pool_idle_time;
+               pool_idle_cpus = NS_TO_TICKS ((double) pool_idle_ns) / (double) ticks;
+               pool_busy_cpus = ((double) lparstats.phys_cpus_pool) - pool_idle_cpus;
+               if (pool_busy_cpus < 0.0)
+                       pool_busy_cpus = 0.0;
 
-               pool_busy_ns = lparstats.pool_busy_time - lparstats_old.pool_busy_time;
-               pool_max_ns  = lparstats.pool_max_time  - lparstats_old.pool_max_time;
-               if (pool_max_ns > pool_busy_ns)
-                       pool_idle_ns = pool_max_ns - pool_busy_ns;
-
-               /* Pool stats are in CPU x ns */
                ssnprintf (typinst, sizeof (typinst), "pool-%X-busy", lparstats.pool_id);
-               lpar_submit (typinst, NS_TO_TICKS ((double) pool_busy_ns) / (double) ticks);
+               lpar_submit (typinst, pool_busy_cpus);
 
                ssnprintf (typinst, sizeof (typinst), "pool-%X-idle", lparstats.pool_id);
-               lpar_submit (typinst, NS_TO_TICKS ((double) pool_idle_ns) / (double) ticks);
+               lpar_submit (typinst, pool_idle_cpus);
        }
 
        memcpy (&lparstats_old, &lparstats, sizeof (lparstats_old));