linux-kernel - Re: [PATCH v2 05/15] perf session: introduce decompressor into trace reader object

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Date:   Mon, 26 Oct 2020 11:54:07 +0300
From:   Alexei Budankov <budankov.lore@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/15] perf session: introduce decompressor into trace
 reader object


On 24.10.2020 18:44, Jiri Olsa wrote:
> On Wed, Oct 21, 2020 at 07:00:30PM +0300, Alexey Budankov wrote:
>>
>> Introduce decompressor to trace reader object so that decompression
>> could be executed on per trace file basis separately for every
>> trace file located in trace directory.
>>
>> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
>> ---
>>  tools/perf/util/session.c | 4 +++-
>>  tools/perf/util/session.h | 1 +
>>  2 files changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
>> index 911b2dbcd0ac..6afc670fdf0c 100644
>> --- a/tools/perf/util/session.c
>> +++ b/tools/perf/util/session.c
>> @@ -44,6 +44,8 @@ static int perf_session__process_compressed_event(struct perf_session *session,
>>  	u64 decomp_last_rem = 0;
>>  	size_t mmap_len, decomp_len = session->header.env.comp_mmap_len;
>>  	struct decomp *decomp, *decomp_last = session->decomp_last;
>> +	struct zstd_data *zstd_data = session->reader ?
>> +		&(session->reader->zstd_data) : &(session->zstd_data);
> 
> I don't think we're using braces in these cases, they are not necessary

Corrected in v3.

Thanks,
Alexei

> 
> jirka
> 
>>  
>>  	if (decomp_last) {
>>  		decomp_last_rem = decomp_last->size - decomp_last->head;
>> @@ -71,7 +73,7 @@ static int perf_session__process_compressed_event(struct perf_session *session,
>>  	src = (void *)event + sizeof(struct perf_record_compressed);
>>  	src_size = event->pack.header.size - sizeof(struct perf_record_compressed);
>>  
>> -	decomp_size = zstd_decompress_stream(&(session->zstd_data), src, src_size,
>> +	decomp_size = zstd_decompress_stream(zstd_data, src, src_size,
>>  				&(decomp->data[decomp_last_rem]), decomp_len - decomp_last_rem);
>>  	if (!decomp_size) {
>>  		munmap(decomp, mmap_len);
>> diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
>> index abdb8518a81f..4fc9ccdf7970 100644
>> --- a/tools/perf/util/session.h
>> +++ b/tools/perf/util/session.h
>> @@ -42,6 +42,7 @@ struct reader {
>>  	u64		 data_size;
>>  	u64		 data_offset;
>>  	reader_cb_t	 process;
>> +	struct zstd_data zstd_data;
>>  };
>>  
>>  struct perf_session {
>> -- 
>> 2.24.1
>>
>>
>