linux-kernel - Re: [PATCH v8 06/22] perf record: Introduce data file at mmap buffer object

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Date:   Thu, 1 Jul 2021 19:41:18 +0300
From:   "Bayduraev, Alexey V" <alexey.v.bayduraev@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Riccardo Mancini <rickyman7@...il.com>
Subject: Re: [PATCH v8 06/22] perf record: Introduce data file at mmap buffer
 object

Hi,

On 30.06.2021 20:23, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jun 30, 2021 at 06:54:45PM +0300, Alexey Bayduraev escreveu:
>> Introduce data file and compressor objects into mmap object so
>> they could be used to process and store data stream from the
>> corresponding kernel data buffer. Make use of the introduced
>> per mmap file and compressor when they are initialized and
>> available.
> 
> So you're introducing even compressed storage in this patchset? To make
> it smaller I thought this could be in a followup cset.

These patches were slit by request from Jiri:

Changes in v5:
- split patch 06/12 to 06/20 and 07/20

request:
https://lore.kernel.org/lkml/YG97LMsttP4VEWPU@krava/

And I'm a bit confused :)

Regards,
Alexey

> 
> - Arnaldo
>  
>> Acked-by: Andi Kleen <ak@...ux.intel.com>
>> Acked-by: Namhyung Kim <namhyung@...il.com>
>> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
>> ---
>>  tools/perf/builtin-record.c | 3 +++
>>  tools/perf/util/mmap.c      | 6 ++++++
>>  tools/perf/util/mmap.h      | 3 +++
>>  3 files changed, 12 insertions(+)
>>
>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>> index cead2b3c56d7..9b7e7a5dc116 100644
>> --- a/tools/perf/builtin-record.c
>> +++ b/tools/perf/builtin-record.c
>> @@ -190,6 +190,9 @@ static int record__write(struct record *rec, struct mmap *map __maybe_unused,
>>  {
>>  	struct perf_data_file *file = &rec->session->data->file;
>>  
>> +	if (map && map->file)
>> +		file = map->file;
>> +
>>  	if (perf_data_file__write(file, bf, size) < 0) {
>>  		pr_err("failed to write perf data, error: %m\n");
>>  		return -1;
>> diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
>> index ab7108d22428..a2c5e4237592 100644
>> --- a/tools/perf/util/mmap.c
>> +++ b/tools/perf/util/mmap.c
>> @@ -230,6 +230,8 @@ void mmap__munmap(struct mmap *map)
>>  {
>>  	bitmap_free(map->affinity_mask.bits);
>>  
>> +	zstd_fini(&map->zstd_data);
>> +
>>  	perf_mmap__aio_munmap(map);
>>  	if (map->data != NULL) {
>>  		munmap(map->data, mmap__mmap_len(map));
>> @@ -291,6 +293,10 @@ int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu)
>>  	map->core.flush = mp->flush;
>>  
>>  	map->comp_level = mp->comp_level;
>> +	if (zstd_init(&map->zstd_data, map->comp_level)) {
>> +		pr_debug2("failed to init mmap commpressor, error %d\n", errno);
>> +		return -1;
>> +	}
>>  
>>  	if (map->comp_level && !perf_mmap__aio_enabled(map)) {
>>  		map->data = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE,
>> diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
>> index 9d5f589f02ae..c4aed6e89549 100644
>> --- a/tools/perf/util/mmap.h
>> +++ b/tools/perf/util/mmap.h
>> @@ -13,6 +13,7 @@
>>  #endif
>>  #include "auxtrace.h"
>>  #include "event.h"
>> +#include "util/compress.h"
>>  
>>  struct aiocb;
>>  
>> @@ -43,6 +44,8 @@ struct mmap {
>>  	struct mmap_cpu_mask	affinity_mask;
>>  	void		*data;
>>  	int		comp_level;
>> +	struct perf_data_file *file;
>> +	struct zstd_data      zstd_data;
>>  };
>>  
>>  struct mmap_params {
>> -- 
>> 2.19.0
>>
>