linux-kernel - Re: [PATCH V2 11/13] perf pmu: Relax uncore wildcard matching to allow numeric suffix

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Message-ID: <12dbc1f5-022d-4653-8ac7-01c503a860dd@linux.intel.com>
Date: Wed, 21 Jan 2026 16:02:23 +0800
From: "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>
To: Ian Rogers <irogers@...gle.com>, Zide Chen <zide.chen@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Andi Kleen <ak@...ux.intel.com>, Eranian Stephane <eranian@...gle.com>,
 linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
 Xudong Hao <xudong.hao@...el.com>, Falcon Thomas <thomas.falcon@...el.com>
Subject: Re: [PATCH V2 11/13] perf pmu: Relax uncore wildcard matching to
 allow numeric suffix


On 1/21/2026 3:18 PM, Ian Rogers wrote:
> On Wed, Dec 31, 2025 at 2:49 PM Zide Chen <zide.chen@...el.com> wrote:
>> Diamond Rapids introduces two types of PCIe related uncore PMUs:
>> "uncore_pcie4_*" and "uncore_pcie6_*".
>>
>> To ensure that generic PCIe events (e.g., UNC_PCIE_CLOCKTICKS) can match
>> and collect events from both PMU types, slightly relax the wildcard
>> matching logic in perf_pmu__match_wildcard().
>>
>> This change allows a wildcard such as "pcie" to match PMU names that
>> include a numeric suffix, such as "pcie4_*" and "pcie6_*".
>>
>> Co-developed-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
>> Signed-off-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
>> Reviewed-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
>> Signed-off-by: Zide Chen <zide.chen@...el.com>
> Can we not merge this. I'd missed a perf tool patch as it was hiding
> in a bunch of kernel uncore updates. At the very least if wildcard
> conventions are updated then the corresponding documentation needs
> updating:
> Documentation/ABI/testing/sysfs-bus-event_source-devices

Ian, thanks for the information. We didn't notice there is such
documentation to describe the name. :(

Besides the documentation, are there other comments? We can update it
together. Thanks.


>
> Thanks,
> Ian
>
>> ---
>>  tools/perf/util/pmu.c | 14 ++++++++------
>>  1 file changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
>> index 956ea273c2c7..01a21b6aa031 100644
>> --- a/tools/perf/util/pmu.c
>> +++ b/tools/perf/util/pmu.c
>> @@ -939,6 +939,7 @@ static bool perf_pmu__match_wildcard(const char *pmu_name, const char *tok)
>>  {
>>         const char *p, *suffix;
>>         bool has_hex = false;
>> +       bool has_underscore = false;
>>         size_t tok_len = strlen(tok);
>>
>>         /* Check start of pmu_name for equality. */
>> @@ -949,13 +950,14 @@ static bool perf_pmu__match_wildcard(const char *pmu_name, const char *tok)
>>         if (*p == 0)
>>                 return true;
>>
>> -       if (*p == '_') {
>> -               ++p;
>> -               ++suffix;
>> -       }
>> -
>> -       /* Ensure we end in a number */
>> +       /* Ensure we end in a number or a mix of number and "_". */
>>         while (1) {
>> +               if (!has_underscore && (*p == '_')) {
>> +                       has_underscore = true;
>> +                       ++p;
>> +                       ++suffix;
>> +               }
>> +
>>                 if (!isxdigit(*p))
>>                         return false;
>>                 if (!has_hex)
>> --
>> 2.52.0
>>