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Mon, 27 Jul 2020 18:46:35 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5C57E124052; Mon, 27 Jul 2020 18:46:35 +0000 (GMT) Received: from rascal.austin.ibm.com (unknown [9.41.179.32]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Mon, 27 Jul 2020 18:46:35 +0000 (GMT) From: Scott Cheloha To: linuxppc-dev@ozlabs.org Subject: [PATCH v2 2/2] powerpc/pseries: new lparcfg key/value pair: partition_affinity_score Date: Mon, 27 Jul 2020 13:46:05 -0500 Message-Id: <20200727184605.2945095-2-cheloha@linux.ibm.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200727184605.2945095-1-cheloha@linux.ibm.com> References: <20200727184605.2945095-1-cheloha@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-27_13:2020-07-27, 2020-07-27 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 spamscore=0 suspectscore=1 priorityscore=1501 malwarescore=0 impostorscore=0 bulkscore=0 adultscore=0 lowpriorityscore=0 mlxscore=0 mlxlogscore=845 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007270125 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nathan Lynch , Tyrel Datwylder Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 Reviewed-by: Tyrel Datwyler Acked-by: Nathan Lynch --- 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);