diff options
| author | Anton Blanchard <anton@samba.org> | 2009-03-31 20:12:44 +0000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2009-04-07 15:18:59 +1000 |
| commit | 0559f0a7611bdd336b7297dce179f793b565f148 (patch) | |
| tree | 9236baea733c3a4f27036988ec16fba8f0ca3897 /arch | |
| parent | 1f8737aab39e15684bf6b6b53586b7c89a269f79 (diff) | |
| download | lwn-0559f0a7611bdd336b7297dce179f793b565f148.tar.gz lwn-0559f0a7611bdd336b7297dce179f793b565f148.zip | |
powerpc/pseries: Add dispatch dispersion statistics
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 <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/lppaca.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/lparcfg.c | 16 |
2 files changed, 17 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h index 68235f7e4a8f..d2a65e8ca6ae 100644 --- a/arch/powerpc/include/asm/lppaca.h +++ b/arch/powerpc/include/asm/lppaca.h @@ -125,7 +125,7 @@ struct lppaca { // 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 diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c index 182e0f642f36..78b3f7840ade 100644 --- a/arch/powerpc/kernel/lparcfg.c +++ b/arch/powerpc/kernel/lparcfg.c @@ -434,6 +434,21 @@ static void pseries_cmo_data(struct seq_file *m) 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 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v) 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 */ |