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lpar plugin: Explain donations a bit more.
author
Florian Forster
<octo@leeloo.lan.home.verplant.org>
Sat, 11 Sep 2010 09:24:14 +0000
(11:24 +0200)
committer
Florian Forster
<octo@leeloo.lan.home.verplant.org>
Sat, 11 Sep 2010 09:24:14 +0000
(11:24 +0200)
src/lpar.c
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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.
* 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 */
*/
/* entitled_proc_capacity is in 1/100th of a CPU */
@@
-237,18
+241,18
@@
static int lpar_read (void)
if (donate_flag)
{
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;
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;
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);
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);