linux-kernel - Re: [PATCH v5 03/10] perf session: define bytes_transferred and bytes

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Message-ID: <a1064e73-c20a-5b21-9d15-77622fccb2cb@linux.intel.com>
Date:   Mon, 11 Mar 2019 16:41:23 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 03/10] perf session: define bytes_transferred and
 bytes_compressed metrics

On 11.03.2019 15:33, Jiri Olsa wrote:
> On Mon, Mar 11, 2019 at 11:19:03AM +0300, Alexey Budankov wrote:
>> On 07.03.2019 11:29, Alexey Budankov wrote:
>>>
>>> On 05.03.2019 15:26, Jiri Olsa wrote:
>>>> On Fri, Mar 01, 2019 at 06:43:28PM +0300, Alexey Budankov wrote:
>>>>>
>>>>> Define bytes_transferred and bytes_compressed metrics to calculate
>>>>> comp_ratio=transferred/compressed in the end of the data collection.
>>>>>
>>>>> bytes_transferred accumulates the amount of bytes that was extracted from
>>>>> the mmaped kernel buffers for compression. bytes_compressed accumulates
>>>>> the amount of bytes that was received after applying compression to
>>>>> move to a storage.
>>>>>
>>>>> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
>>>>> ---
>>>>>  tools/perf/builtin-record.c | 8 ++++++++
>>>>>  tools/perf/util/env.h       | 1 +
>>>>>  tools/perf/util/session.h   | 2 ++
>>>>>  3 files changed, 11 insertions(+)
>>>>>
>>>>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>>>>> index 9b02a68e8c23..ab121bc27c6d 100644
>>>>> --- a/tools/perf/builtin-record.c
>>>>> +++ b/tools/perf/builtin-record.c
>>>>> @@ -1449,6 +1449,14 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
>>>>>  	record__mmap_read_all(rec, true);
>>>>>  	record__aio_mmap_read_sync(rec);
>>>>>  
>>>>> +	if (!quiet && rec->session->bytes_transferred && rec->session->bytes_compressed) {
>>>>> +		float ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
>>>>> +
>>>>> +		session->header.env.comp_ratio = ratio + 0.5;
>>>>
>>>> what's the + 0.5 for?
>>>
>>> Arithmetic rounding before type cast.
>>>
>>>>
>>>>> +		fprintf(stderr,	"[ perf record: Compressed %.3f MB to %.3f MB, ratio is %.3f ]\n",
>>>>> +			rec->session->bytes_transferred / 1024.0 / 1024.0, rec->session->bytes_compressed / 1024.0 / 1024.0, ratio);
>>>>> +	}
>>>>> +
>>>>
>>>> could this be below together with the current:
>>>>
>>>> 	fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s ]\n",
>>>
>>> Please provide an example of what you exactly mean.
>>
>> It could look like this:
>>
>> [ perf record: Woken up 101 times to write data ]
>> [ perf record: Captured and wrote 5.173 MB perf.data (714077 samples), compressed 27.241 MB to 5.160 MB, ratio is 5.279 ]
> 
> yes, maybe we don't need to repeat the original size twice:
> 
> [ perf record: Captured and wrote 5.173 MB perf.data (714077 samples), compressed (original 27.241 MB, ratio 5.279) ]

Ok, lets have it like this.

~Alexey

> 
> jirka
>