linux-kernel - Re: [PATCH v1 0/3] perf: Support a new coresum event qualifier

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Date:   Sat, 16 Mar 2019 07:07:17 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v1 0/3] perf: Support a new coresum event qualifier



On 3/15/2019 9:34 PM, Jiri Olsa wrote:
> On Sat, Mar 16, 2019 at 12:04:13AM +0800, Jin Yao wrote:
>> The coresum event qualifier which sums up the event counts for both
>> hardware threads in a core. For example,
>>
>> perf stat -e cpu/event=0,umask=0x3,coresum=1/,cpu/event=0,umask=0x3/
>>
>> In this example, we count the event 'ref-cycles' per-core and per-CPU in
>> one perf stat command-line.
>>
>> We can already support per-core counting with --per-core, but it's
>> often useful to do this together with other metrics that are collected
>> per CPU (per hardware thread). So this patch series supports this
>> per-core counting on a event level.
> 
> seems useful, but perhaps we should follow the --per-core option
> we already have and call it 'per-core' instead of coresum
> 
> jirka
> 

Yes, the coresum's behavior is similar as --per-core option, just 
supports at the event level. I'm OK with calling it 'per-core'.

For example,
perf stat -e cpu/event=0,umask=0x3,per-core=1/

Thanks
Jin Yao

>>
>> Jin Yao (3):
>>    perf: Add a coresum event qualifier
>>    perf stat: Support coresum event qualifier
>>    perf test: Add a simple test for term coresum
>>
>>   tools/perf/Documentation/perf-stat.txt |   4 ++
>>   tools/perf/builtin-stat.c              |  21 +++++++
>>   tools/perf/tests/parse-events.c        |  10 ++-
>>   tools/perf/util/evsel.c                |   2 +
>>   tools/perf/util/evsel.h                |   3 +
>>   tools/perf/util/parse-events.c         |  27 +++++++++
>>   tools/perf/util/parse-events.h         |   1 +
>>   tools/perf/util/parse-events.l         |   1 +
>>   tools/perf/util/stat-display.c         | 108 ++++++++++++++++++++++++---------
>>   tools/perf/util/stat.c                 |   8 ++-
>>   10 files changed, 151 insertions(+), 34 deletions(-)
>>
>> -- 
>> 2.7.4
>>