linux-kernel - Re: [PATCH 1/5] perf session: Get rid of file

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Date:   Wed, 26 Dec 2018 16:43:42 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/5] perf session: Get rid of file_size variable

Em Wed, Dec 26, 2018 at 02:51:28PM +0100, Jiri Olsa escreveu:
> It's not needed and removing it makes the code little
> more simple for upcoming changes.
> 
> It's safe to replace file_size with data_size, because
> perf_data__size value is never smaller than data_offset
> + data_size.

This is not applying to my perf/core branch, can you check?

- Arnaldo
 
> Link: http://lkml.kernel.org/n/tip-ocz7zwwkkx11v0mkxrtcddih@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/session.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 3972f081a8f4..d6c1d3853f27 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1818,7 +1818,6 @@ static int __perf_session__process_events(struct perf_session *session)
>  	struct ordered_events *oe = &session->ordered_events;
>  	struct perf_tool *tool = session->tool;
>  	int fd = perf_data__fd(session->data);
> -	u64 file_size = perf_data__size(session->data);
>  	u64 data_offset = session->header.data_offset;
>  	u64 data_size = session->header.data_size;
>  	u64 head, page_offset, file_offset, file_pos, size;
> @@ -1838,14 +1837,13 @@ static int __perf_session__process_events(struct perf_session *session)
>  	if (data_size == 0)
>  		goto out;
>  
> -	if (data_offset + data_size < file_size)
> -		file_size = data_offset + data_size;
> +	ui_progress__init_size(&prog, data_size, "Processing events...");
>  
> -	ui_progress__init_size(&prog, file_size, "Processing events...");
> +	data_size += data_offset;
>  
>  	mmap_size = MMAP_SIZE;
> -	if (mmap_size > file_size) {
> -		mmap_size = file_size;
> +	if (mmap_size > data_size) {
> +		mmap_size = data_size;
>  		session->one_mmap = true;
>  	}
>  
> @@ -1910,7 +1908,7 @@ static int __perf_session__process_events(struct perf_session *session)
>  	if (session_done())
>  		goto out;
>  
> -	if (file_pos < file_size)
> +	if (file_pos < data_size)
>  		goto more;
>  
>  out:
> -- 
> 2.17.2

-- 

- Arnaldo