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Thunderbird/102.6.1 Subject: Re: [PATCH v8 1/9] perf pmu: Add #slots literal support for arm64 To: Jing Zhang , Ian Rogers Cc: Xing Zhengjun , Will Deacon , James Clark , Mike Leach , Leo Yan , linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Andrew Kilroy , Shuai Xue , Zhuo Song References: <1673940573-90503-1-git-send-email-renyu.zj@linux.alibaba.com> <1673940573-90503-2-git-send-email-renyu.zj@linux.alibaba.com> Content-Language: en-US From: John Garry Organization: Oracle Corporation In-Reply-To: <1673940573-90503-2-git-send-email-renyu.zj@linux.alibaba.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: LO2P265CA0268.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a1::16) To DM6PR10MB4313.namprd10.prod.outlook.com (2603:10b6:5:212::20) MIME-Version: 1.0 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X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR10MB6696 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.923,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-17_04,2023-01-13_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 bulkscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301170073 X-Proofpoint-GUID: rwX1q6YOP3JBBlMF3ZfKLSvJXETmP3V9 X-Proofpoint-ORIG-GUID: rwX1q6YOP3JBBlMF3ZfKLSvJXETmP3V9 Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org On 17/01/2023 07:29, Jing Zhang wrote: > The slots in each architecture may be different, so add #slots literal > to obtain the slots of different architectures, and the #slots can be > applied in the metric. Currently, The #slots just support for arm64, > and other architectures will return NAN. > > On arm64, the value of slots is from the register PMMIR_EL1.SLOT, which > I can read in /sys/bus/event_source/device/armv8_pmuv3_*/caps/slots. > PMMIR_EL1.SLOT might read as zero if the PMU version is lower than > ID_AA64DFR0_EL1_PMUVer_V3P4 or the STALL_SLOT event is not implemented. > > Signed-off-by: Jing Zhang Reviewed-by: John Garry