On 7/27/20 11:46 AM, Scott Cheloha wrote: > The H_GetPerformanceCounterInfo (GPCI) PHYP hypercall has a subcall, > Affinity_Domain_Info_By_Partition, which returns, among other things, > a "partition affinity score" for a given LPAR. This score, a value on > [0-100], represents the processor-memory affinity for the LPAR in > question. A score of 0 indicates the worst possible affinity while a > score of 100 indicates perfect affinity. The score can be used to > reason about performance. > > This patch adds the score for the local LPAR to the lparcfg procfile > under a new 'partition_affinity_score' key. > > Signed-off-by: Scott Cheloha <chel...@linux.ibm.com>
I was hoping Michael would chime in the first time around on this patch series about adding another key/value pair to lparcfg. So, barring a NACK from mpe: Reviewed-by: Tyrel Datwyler <tyr...@linux.ibm.com> > --- > arch/powerpc/platforms/pseries/lparcfg.c | 35 ++++++++++++++++++++++++ > 1 file changed, 35 insertions(+) > > diff --git a/arch/powerpc/platforms/pseries/lparcfg.c > b/arch/powerpc/platforms/pseries/lparcfg.c > index b8d28ab88178..e278390ab28d 100644 > --- a/arch/powerpc/platforms/pseries/lparcfg.c > +++ b/arch/powerpc/platforms/pseries/lparcfg.c > @@ -136,6 +136,39 @@ static unsigned int h_get_ppp(struct hvcall_ppp_data > *ppp_data) > return rc; > } > > +static void show_gpci_data(struct seq_file *m) > +{ > + struct hv_gpci_request_buffer *buf; > + unsigned int affinity_score; > + long ret; > + > + buf = kmalloc(sizeof(*buf), GFP_KERNEL); > + if (buf == NULL) > + return; > + > + /* > + * Show the local LPAR's affinity score. > + * > + * 0xB1 selects the Affinity_Domain_Info_By_Partition subcall. > + * The score is at byte 0xB in the output buffer. > + */ > + memset(&buf->params, 0, sizeof(buf->params)); > + buf->params.counter_request = cpu_to_be32(0xB1); > + buf->params.starting_index = cpu_to_be32(-1); /* local LPAR */ > + buf->params.counter_info_version_in = 0x5; /* v5+ for score */ > + ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, virt_to_phys(buf), > + sizeof(*buf)); > + if (ret != H_SUCCESS) { > + pr_debug("hcall failed: H_GET_PERF_COUNTER_INFO: %ld, %x\n", > + ret, be32_to_cpu(buf->params.detail_rc)); > + goto out; > + } > + affinity_score = buf->bytes[0xB]; > + seq_printf(m, "partition_affinity_score=%u\n", affinity_score); > +out: > + kfree(buf); > +} > + > static unsigned h_pic(unsigned long *pool_idle_time, > unsigned long *num_procs) > { > @@ -487,6 +520,8 @@ static int pseries_lparcfg_data(struct seq_file *m, void > *v) > partition_active_processors * 100); > } > > + show_gpci_data(m); > + > seq_printf(m, "partition_active_processors=%d\n", > partition_active_processors); > >