linux-kernel - Re: [PATCH] perf report: Output non-zero offset for decompressed records

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Date:   Mon, 4 Oct 2021 08:42:19 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        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] perf report: Output non-zero offset for decompressed
 records

On Wed, Sep 29, 2021 at 12:14:45PM +0300, Alexey Bayduraev wrote:
> Print offset of PERF_RECORD_COMPRESSED record instead of zero for
> decompressed records in raw trace dump (-D option of perf-report):
> 
> 0x17cf08 [0x28]: event: 9
> 
> instead of:
> 
> 0 [0x28]: event: 9
> 
> The fix is not critical, because currently file_pos for compressed
> events is used in perf_session__process_event only to show offsets
> in the raw dump.

hi,
I don't mind the change just curious, because I see also:

  perf_session__process_event
    perf_session__process_user_event
      lseek(fd, file_offset, ...

which is not raw dump as the comment suggests

thanks,
jirka

> 
> This patch was separated from patchset:
> https://lore.kernel.org/lkml/cover.1629186429.git.alexey.v.bayduraev@linux.intel.com/
> and was already rewieved.
> 
> Acked-by: Namhyung Kim <namhyung@...nel.org>
> Acked-by: Andi Kleen <ak@...ux.intel.com>
> Reviewed-by: Riccardo Mancini <rickyman7@...il.com>
> Tested-by: Riccardo Mancini <rickyman7@...il.com>
> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
> ---
>  tools/perf/util/session.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 069c2cfdd3be..352f16076e01 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -2116,7 +2116,7 @@ fetch_decomp_event(u64 head, size_t mmap_size, char *buf, bool needs_swap)
>  static int __perf_session__process_decomp_events(struct perf_session *session)
>  {
>  	s64 skip;
> -	u64 size, file_pos = 0;
> +	u64 size;
>  	struct decomp *decomp = session->decomp_last;
>  
>  	if (!decomp)
> @@ -2132,7 +2132,7 @@ static int __perf_session__process_decomp_events(struct perf_session *session)
>  		size = event->header.size;
>  
>  		if (size < sizeof(struct perf_event_header) ||
> -		    (skip = perf_session__process_event(session, event, file_pos)) < 0) {
> +		    (skip = perf_session__process_event(session, event, decomp->file_pos)) < 0) {
>  			pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
>  				decomp->file_pos + decomp->head, event->header.size, event->header.type);
>  			return -EINVAL;
> -- 
> 2.19.0
>