linux-kernel - Re: [PATCH bpf-next 1/3] perf: enable branch record for software events

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Date:   Thu, 26 Aug 2021 16:41:20 +0000
From:   Song Liu <songliubraving@...com>
To:     kajoljain <kjain@...ux.ibm.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next 1/3] perf: enable branch record for software
 events



> On Aug 26, 2021, at 12:56 AM, kajoljain <kjain@...ux.ibm.com> wrote:
> 
> 
> 
> On 8/25/21 8:52 PM, Song Liu wrote:
>> 
>> 
>>> On Aug 25, 2021, at 5:09 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>>> 
>>> On Mon, Aug 23, 2021 at 11:01:55PM -0700, Song Liu wrote:
>>> 
>>>> arch/x86/events/intel/core.c |  5 ++++-
>>>> arch/x86/events/intel/lbr.c  | 12 ++++++++++++
>>>> arch/x86/events/perf_event.h |  2 ++
>>>> include/linux/perf_event.h   | 33 +++++++++++++++++++++++++++++++++
>>>> kernel/events/core.c         | 28 ++++++++++++++++++++++++++++
>>>> 5 files changed, 79 insertions(+), 1 deletion(-)
>>> 
>>> No PowerPC support :/
>> 
>> I don't have PowerPC system for testing at the moment. I guess we can decide
>> the overall framework now, and ask PowerPC folks' help on PowerPC support
>> later? 
> 
> Hi Song,
>   I will look at powerpc side to enable this.
> 
> Thanks,
> Kajol Jain

Thanks Kajol! 

Let me address Peter's other comments and send v2. We can then merge in  
PowerPC support.

Song