linux-kernel - Re: [PATCH v9 3/5] perf utils: use pmu->is

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Date:   Tue, 5 Dec 2017 20:35:22 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Ganapatrao Kulkarni <gklkml16@...il.com>
Cc:     Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Will Deacon <Will.Deacon@....com>, catalin.marinas@....com,
        mark.rutland@....com, Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, jnair@...iumnetworks.com,
        Zhangshaokun <zhangshaokun@...ilicon.com>,
        Jonathan.Cameron@...wei.com,
        Robert Richter <Robert.Richter@...ium.com>,
        "Jin, Yao" <yao.jin@...el.com>
Subject: Re: [PATCH v9 3/5] perf utils: use pmu->is_uncore to detect PMU
 UNCORE devices

A quick test with the new patch 'fix_json_v9_2.patch' shows it working.

See the log:

root@skl:/tmp# perf stat --per-thread -p 10322 -M CPI,IPC
^C
  Performance counter stats for process id '10322':

           vmstat-10322             1,879,654      inst_retired.any 
#      0.8 CPI
           vmstat-10322             1,565,807      cycles
           vmstat-10322             1,879,654      inst_retired.any 
#      1.2 IPC
           vmstat-10322             1,565,807      cpu_clk_unhalted.thread

        2.850291804 seconds time elapsed

Thanks for fixing it quickly.

Thanks
Jin Yao

On 12/5/2017 3:23 PM, Jin, Yao wrote:
> Hi,
> 
> I applied the diff but it's failed.
> 
> jinyao@skl:~/skl-ws/perf-dev/lck-4594/src$ patch -p1 < 1.pat
> patching file tools/perf/util/pmu.c
> patch: **** malformed patch at line 41: *head, struct perf_pmu *pmu)
> 
> Could you send the patch as attachment to me in another mail thread?
> 
> to yao.jin@...ux.intel.com
> cc yao.jin@...el.com
> 
> Thanks
> Jin Yao
> 
> On 12/5/2017 3:12 PM, Ganapatrao Kulkarni wrote:
>> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
>> index 5ad8a18..57e38fd 100644
>> --- a/tools/perf/util/pmu.c
>> +++ b/tools/perf/util/pmu.c
>> @@ -538,6 +538,34 @@ static bool pmu_is_uncore(const char *name)
>>   }
>>
>>   /*
>> + *  PMU CORE devices have different name other than cpu in sysfs on some
>> + *  platforms. looking for possible sysfs files to identify as core 
>> device.
>> + */
>> +static int is_pmu_core(const char *name)
>> +{
>> + struct stat st;
>> + char path[PATH_MAX];
>> + const char *sysfs = sysfs__mountpoint();
>> +
>> + if (!sysfs)
>> + return 0;
>> +
>> + /* Look for cpu sysfs (x86 and others) */
>> + scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/cpu", sysfs);
>> + if ((stat(path, &st) == 0) &&
>> + (strncmp(name, "cpu", strlen("cpu")) == 0))
>> + return 1;
>> +
>> + /* Look for cpu sysfs (specific to arm) */
>> + scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus",
>> + sysfs, name);
>> + if (stat(path, &st) == 0)
>> + return 1;
>> +
>> + return 0;
>> +}
>> +
>> +/*
>>    * Return the CPU id as a raw string.
>>    *
>>    * Each architecture should provide a more precise id string that
>> @@ -641,7 +669,7 @@ static void pmu_add_cpu_aliases(struct list_head
>> *head, struct perf_pmu *pmu)
>>    break;
>>    }
>>
>> - if (pmu->is_uncore) {
>> + if (!is_pmu_core(name)) {
>>    /* check for uncore devices */
>>    if (pe->pmu == NULL)
>>    continue;