powerpc/pseries: new lparcfg key/value pair: partition_affinity_score (5d1bc776) · Commits · 戴 / test

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

arch/powerpc/platforms/pseries/lparcfg.c

+35 −0

Original line number	Diff line number	Diff line
		@@ -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);

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