linux-kernel - Re: [PATCH v1] perf parse-events: Fix for term values that are raw events

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Date:   Thu, 12 Oct 2023 10:23:00 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        James Clark <james.clark@....com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v1] perf parse-events: Fix for term values that are raw events

On Thu, Oct 5, 2023 at 3:13 PM Ian Rogers <irogers@...gle.com> wrote:
>
> On Wed, Sep 27, 2023 at 5:44 PM Ian Rogers <irogers@...gle.com> wrote:
> >
> > Raw events can be strings like 'r0xead' but the 0x is optional so they
> > can also be 'read'. On IcelakeX uncore_imc_free_running has an event
> > called 'read' which may be programmed as:
> > ```
> > $ perf stat -e 'uncore_imc_free_running/event=read/' -a sleep 1
> > ```
> > However, the PE_RAW type isn't allowed on the right of a term, even
> > though in this case we just want to interpret it as a string. This
> > leads to the following error on IcelakeX:
> > ```
> > $ perf stat -e 'uncore_imc_free_running/event=read/' -a sleep 1
> > event syntax error: '..nning/event=read/'
> >                                   \___ parser error
> > Run 'perf list' for a list of valid events
> >
> >  Usage: perf stat [<options>] [<command>]
> >
> >     -e, --event <event> event selector. use 'perf list' to list available events
> > ```
> > Fix this by allowing raw types on the right of terms and treat them as
> > strings, just as is already done for PE_LEGACY_CACHE. Make this
> > consistent by just entirely removing name_or_legacy and always using
> > name_or_raw that covers all three cases.
> >
> > Fixes: 6fd1e5191591 ("perf parse-events: Support PMUs for legacy cache events")
> > Signed-off-by: Ian Rogers <irogers@...gle.com>

Applied to perf-tools-next, thanks!