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powerpc/pseries: new lparcfg key/value pair: partition_affinity_score

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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 <cheloha@linux.ibm.com>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Acked-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200727184605.2945095-2-cheloha@linux.ibm.com
This commit is contained in:
Scott Cheloha 2020-07-27 13:46:05 -05:00 committed by Michael Ellerman
parent 59562b5c33
commit 5d1bc77642
1 changed files with 35 additions and 0 deletions
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35
arch/powerpc/platforms/pseries/lparcfg.c
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@ -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);