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

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Date:   Sat, 24 Oct 2020 17:44:38 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     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 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

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
> 
>