lpar plugin: Explain donations a bit more.

diff --git a/src/lpar.c b/src/lpar.c
index bf504e8..9c2cd45 100644 (file)
--- a/src/lpar.c
+++ b/src/lpar.c
@@ -217,6 +217,10 @@ static int lpar_read (void)
         * capacity not used by the partition may be assigned to a different
         * partition by the hypervisor, so "idle" is hopefully a very small
         * number.
+        *
+        * A dedicated partition may donate its CPUs to another partition and
+        * may steal ticks from somewhere else (another partition or maybe the
+        * shared pool, I don't know --octo).
         */
 
        /* entitled_proc_capacity is in 1/100th of a CPU */
@@ -237,18 +241,18 @@ static int lpar_read (void)
 
        if (donate_flag)
        {
+               /* donated => ticks given to another partition
+                * stolen  => ticks received from another partition */
                u_longlong_t idle_donated_ticks, busy_donated_ticks;
                u_longlong_t idle_stolen_ticks, busy_stolen_ticks;
 
+               /* FYI:  PURR == Processor Utilization of Resources Register
+                *      SPURR == Scaled PURR */
                idle_donated_ticks = lparstats.idle_donated_purr - idle_donated_old;
                busy_donated_ticks = lparstats.busy_donated_purr - busy_donated_old;
                idle_stolen_ticks  = lparstats.idle_stolen_purr  - idle_stolen_old;
                busy_stolen_ticks  = lparstats.busy_stolen_purr  - busy_stolen_old;
 
-               /* FYI:  PURR == Processor Utilization of Resources Register
-                *      SPURR == Scaled PURR */
-               /* donated => ticks given to another partition
-                * stolen  => ticks received from another partition */
                lpar_submit ("idle_donated", (double) idle_donated_ticks / (double) ticks);
                lpar_submit ("busy_donated", (double) busy_donated_ticks / (double) ticks);
                lpar_submit ("idle_stolen",  (double) idle_stolen_ticks  / (double) ticks);