PHYP tells us how often a shared processor dispatch changed physical cpus.
This can highlight performance problems caused by the hypervisor.
Signed-off-by: Anton Blanchard <an...@samba.org>
---
Index: linux-2.6/arch/powerpc/include/asm/lppaca.h
===================================================================
--- linux-2.6.orig/arch/powerpc/include/asm/lppaca.h 2009-02-28
18:37:02.000000000 +1100
+++ linux-2.6/arch/powerpc/include/asm/lppaca.h 2009-02-28 18:37:07.000000000
+1100
@@ -125,7 +125,7 @@
// NOTE: This value will ALWAYS be zero for dedicated processors and
// will NEVER be zero for shared processors (ie, initialized to a 1).
volatile u32 yield_count; // PLIC increments each dispatchx00-x03
- u32 reserved6;
+ volatile u32 dispersion_count; // dispatch changed phys cpu x04-x07
volatile u64 cmo_faults; // CMO page fault count x08-x0F
volatile u64 cmo_fault_time; // CMO page fault time x10-x17
u8 reserved7[104]; // Reserved x18-x7F
Index: linux-2.6/arch/powerpc/kernel/lparcfg.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/lparcfg.c 2009-02-28
18:37:02.000000000 +1100
+++ linux-2.6/arch/powerpc/kernel/lparcfg.c 2009-02-28 18:38:50.000000000
+1100
@@ -434,6 +434,21 @@
seq_printf(m, "cmo_page_size=%lu\n", cmo_get_page_size());
}
+static void splpar_dispatch_data(struct seq_file *m)
+{
+ int cpu;
+ unsigned long dispatches = 0;
+ unsigned long dispatch_dispersions = 0;
+
+ for_each_possible_cpu(cpu) {
+ dispatches += lppaca[cpu].yield_count;
+ dispatch_dispersions += lppaca[cpu].dispersion_count;
+ }
+
+ seq_printf(m, "dispatches=%lu\n", dispatches);
+ seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
+}
+
static int pseries_lparcfg_data(struct seq_file *m, void *v)
{
int partition_potential_processors;
@@ -460,6 +475,7 @@
parse_ppp_data(m);
parse_mpp_data(m);
pseries_cmo_data(m);
+ splpar_dispatch_data(m);
seq_printf(m, "purr=%ld\n", get_purr());
} else { /* non SPLPAR case */
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