[PATCH drivers/perf: hisi: 1/2] drivers/perf: hisi: hns3: default use hardware event 0 as group leader event.

[Jijie Shao]

on 2023/8/21 19:58, Will Deacon wrote:
> On Wed, Aug 16, 2023 at 05:46:18PM +0800, Jijie Shao wrote:
>> From: Hao Chen <chenhao418 at huawei.com>
>>
>> For hns3 pmu events, we use command as below before:
>> perf stat -g -e hns3_pmu_sicl_0/config=0x00105,global=1/
>> -e hns3_pmu_sicl_0/config=0x10105,global=1/ -I 1000
>>
>> We want to use -g parameter to make 0x00105 event and 0x10105 event
>> share a hardware event, but for kernel 6.2, 'commit 5f8f95673f68
>> ("perf evlist: Remove group option.")' remove -g parameter.
>>
>> So add this patch to set default related event idx as 0 to share
>> the first hardware event.
> Hmm, but the change cited above is a userspace change so I don't think
> we should be making driver-side changes for that. Furthermore, the commit
> message there suggests that you should be using a different syntax,
> introduced by 89efb029502d ("perf tools: Add support to parse event
> group syntax") (which describes the grammer and has some examples too).
>
> Will

Thanks for your introduction, we are retesting this scenario as

89efb029502d("perf tools: Add support to parse eventgroup syntax")

Jijie Shao