linux-kernel - Re: [PATCH V3 1/5] perf/core: Add PERF_SAMPLE_WEIGHT

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Date:   Fri, 5 Feb 2021 19:43:51 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     "Liang, Kan" <kan.liang@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        Yao Jin <yao.jin@...ux.intel.com>,
        Michael Ellerman <mpe@...erman.id.au>, maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH V3 1/5] perf/core: Add PERF_SAMPLE_WEIGHT_STRUCT

On Fri, Feb 5, 2021 at 12:24 AM Liang, Kan <kan.liang@...ux.intel.com> wrote:
>
> On 2/4/2021 9:00 AM, Namhyung Kim wrote:
> > Hi Kan,
> >
> > On Sat, Jan 30, 2021 at 2:25 AM Liang, Kan <kan.liang@...ux.intel.com> wrote:
> > [SNIP]
> >> diff --git a/include/uapi/linux/perf_event.h
> >> b/include/uapi/linux/perf_event.h
> >> index b15e344..c50718a 100644
> >> --- a/include/uapi/linux/perf_event.h
> >> +++ b/include/uapi/linux/perf_event.h
> >> @@ -145,12 +145,14 @@ enum perf_event_sample_format {
> >>          PERF_SAMPLE_CGROUP                      = 1U << 21,
> >>          PERF_SAMPLE_DATA_PAGE_SIZE              = 1U << 22,
> >>          PERF_SAMPLE_CODE_PAGE_SIZE              = 1U << 23,
> >> +       PERF_SAMPLE_WEIGHT_STRUCT               = 1U << 24,
> >>
> >> -       PERF_SAMPLE_MAX = 1U << 24,             /* non-ABI */
> >> +       PERF_SAMPLE_MAX = 1U << 25,             /* non-ABI */
> >>
> >>          __PERF_SAMPLE_CALLCHAIN_EARLY           = 1ULL << 63, /* non-ABI; internal use */
> >>    };
> >>
> >> +#define PERF_SAMPLE_WEIGHT_TYPE        (PERF_SAMPLE_WEIGHT |
> >> PERF_SAMPLE_WEIGHT_STRUCT)
> >
> > I'm not sure you want to expose it in the uapi header as it's not
> > intended to be used IMHO.
> >
>
> I'm not sure I understood, but it's indeed used in the tool patch set.
>
> https://lore.kernel.org/lkml/1612296553-21962-6-git-send-email-kan.liang@linux.intel.com/

Well, it's not a big deal.. but I just worried if some users might do

  event.attr.sample_type = PERF_SAMPLE_WEIGHT_TYPE;

Thanks,
Namhyung