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Date:   Sat, 24 Oct 2020 17:44:47 +0200
From:   Jiri Olsa <jolsa@redhat.com>
To:     Alexey Budankov <alexey.budankov@linux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 04/15] perf session: move reader object definition to
 header file
Message-ID: <20201024154447.GJ2589351@krava>
References: <1ec29ed6-0047-d22f-630b-a7f5ccee96b4@linux.intel.com>
 <635d39aa-5ce8-2c0b-9b12-952b95ed22da@linux.intel.com>
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On Wed, Oct 21, 2020 at 06:59:48PM +0300, Alexey Budankov wrote:
> 
> Move definition of reader to session header file to be shared
> among different source files. Introduce reference to active
> reader object from session object.
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
> ---
>  tools/perf/util/session.c | 27 ---------------------------
>  tools/perf/util/session.h | 25 +++++++++++++++++++++++++
>  2 files changed, 25 insertions(+), 27 deletions(-)
> 
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 6f09d506b2f6..911b2dbcd0ac 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -2110,33 +2110,6 @@ static int __perf_session__process_decomp_events(struct perf_session *session)
>  	return 0;
>  }
>  
> -/*
> - * On 64bit we can mmap the data file in one go. No need for tiny mmap
> - * slices. On 32bit we use 32MB.
> - */
> -#if BITS_PER_LONG == 64
> -#define MMAP_SIZE ULLONG_MAX
> -#define NUM_MMAPS 1
> -#else
> -#define MMAP_SIZE (32 * 1024 * 1024ULL)
> -#define NUM_MMAPS 128
> -#endif
> -
> -struct reader;
> -
> -typedef s64 (*reader_cb_t)(struct perf_session *session,
> -			   union perf_event *event,
> -			   u64 file_offset,
> -			   const char *file_path);
> -
> -struct reader {
> -	int		 fd;
> -	const char	 *path;
> -	u64		 data_size;
> -	u64		 data_offset;
> -	reader_cb_t	 process;
> -};
> -
>  static int
>  reader__process_events(struct reader *rd, struct perf_session *session,
>  		       struct ui_progress *prog)
> diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
> index 378ffc3e2809..abdb8518a81f 100644
> --- a/tools/perf/util/session.h
> +++ b/tools/perf/util/session.h
> @@ -20,6 +20,30 @@ struct thread;
>  struct auxtrace;
>  struct itrace_synth_opts;
>  
> +/*
> + * On 64bit we can mmap the data file in one go. No need for tiny mmap
> + * slices. On 32bit we use 32MB.
> + */
> +#if BITS_PER_LONG == 64
> +#define MMAP_SIZE ULLONG_MAX
> +#define NUM_MMAPS 1
> +#else
> +#define MMAP_SIZE (32 * 1024 * 1024ULL)
> +#define NUM_MMAPS 128
> +#endif
> +
> +typedef s64 (*reader_cb_t)(struct perf_session *session,
> +			   union perf_event *event,
> +			   u64 file_offset, const char *file_path);
> +
> +struct reader {
> +	int		 fd;
> +	const char	 *path;
> +	u64		 data_size;
> +	u64		 data_offset;
> +	reader_cb_t	 process;
> +};

I wasn't able to find where is this used ouf of session.c ?


> +
>  struct perf_session {
>  	struct perf_header	header;
>  	struct machines		machines;
> @@ -41,6 +65,7 @@ struct perf_session {
>  	struct zstd_data	zstd_data;
>  	struct decomp		*decomp;
>  	struct decomp		*decomp_last;
> +	struct reader		*reader;

please define it in the patch where it's actualy used

thanks,
jirka